1
|
Chen JP, Song C, Jin T, Xu J, Yang LM. Synergistic effect on simultaneous treatment of Cr(VI) and chloramphenicol using a non-thermal plasma technology. Chemosphere 2024:142304. [PMID: 38734253 DOI: 10.1016/j.chemosphere.2024.142304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 05/05/2024] [Accepted: 05/09/2024] [Indexed: 05/13/2024]
Abstract
Toxic organic and heavy metal contaminants commonly exist in industrial waste stream and the treatment is of great challenge. In this study, a dielectric barrier discharge (DBD) non-thermal plasma was employed for the simultaneous treatment of two important contaminants, chloramphenicol (CAP) and Cr(VI) in an aqueous solution through redox transformations. More than 70% of CAP and 20% of TOC were degraded in 60 min, while Cr(VI) was completely removed in 10 min. The hydroxyl radicals could be the main active species for the degradation. Meanwhile, the consumption of hydroxyl radicals was beneficial to the reduction of Cr(VI). The synergistic effect was investigated between CAP degradation and Cr(VI) reduction. The reduction of Cr(VI) would be enhanced in the presence of CAP with a low concentration and could be inhibited under a high concentration of CAP, because part of hydroxyl radicals could be consumed by a low concentration of CAP and the obtained intermediates with a higher kinetic rate. However, CAP with a high concentration could also react with some reductive species, such as eaq- and •H, which could compete with Cr(VI) and inhibit the reduction of Cr(VI). In addition, the presence of Cr(VI) could enhance the degradation and mineralization of CAP, and the identification of obtained intermediates indicated that the presence of Cr(VI) could change the degradation path of CAP as Cr(VI) would react with reductive species and enhance the generation of hydroxyl radicals, leading to more hydroxylation reactions. Moreover, the mechanism for the simultaneous redox transformations of CAP and Cr(VI) was illustrated. This study indicates that the DBD non-thermal plasma technology could be one of better solutions for simultaneous elimination of heavy metal and organic contaminants in aquatic environment.
Collapse
Affiliation(s)
- J Paul Chen
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518055, China; Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge, Singapore.
| | - Chao Song
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge, Singapore
| | - Tenghui Jin
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518055, China
| | - Jiajie Xu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518055, China
| | - Li-Ming Yang
- Department of Chemical and Biochemical Engineering, National University of Singapore, 10 Kent Ridge, Singapore
| |
Collapse
|
2
|
Xu J, Liu Z, Jin T, Yang X, Chen H, Chen JP. Development and testing of alginate/C 3N 4porphyrin bead as a self-initiated Fenton photocatalyst for highly efficient atrazine removal. Sci Total Environ 2024:173112. [PMID: 38734090 DOI: 10.1016/j.scitotenv.2024.173112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 05/07/2024] [Accepted: 05/08/2024] [Indexed: 05/13/2024]
Abstract
Fenton reaction has been widely used for the efficient treatment of organic wastewater. However, its applications are limited by such key factors as a requirement of a workable pH < 3. In this study, we developed, tested, and optimized the alginate/C3N4porphyrin bead (alginate/C3N4por) as a recyclable photocatalyst in a photocatalysis-self-Fenton process to overcome these limitations. Porphyrin-modified C3N4 (C3N4por) was used as an H2O2 donator, while Fe(III) nodes served as a Fenton reagent. The as-prepared floating alginate/C3N4por bead utilized the light source as a driving force for the catalysis. Under visible light irradiation for 6 h, the model pollutant atrazine was degraded by 70.96 %, demonstrating better photocatalytic performance than alginate/C3N4 beads. This improvement was attributed to the higher H2O2 yield of C3N4por. The alginate/C3N4por bead showed better photocatalytic activity even after four consecutive cycles and could easily be recovered for reuse. Furthermore, Fe(III)/Ca(II) bimetallic alginate bead exhibited better photocatalytic activity and a higher content of •OH radicals than the Ca(II) monometallic alginate beads, due to the ability of Fe(III) nodes to serve as a Fenton reagent. The influences of light sources, and commonly existing matters (namely SO42-, Cl-, CO32-, NO3-, and humic acid) were investigated. Moreover, the alginate/C3N4por bead demonstrated good photocatalytic performance in a simulated natural environment without the addition of extra H2O2, with an atrazine removal percentage of up to 96.3 % after 3-h irradiation. These findings indicated the great potential of alginate/C3N4por beads in practical applications.
Collapse
Affiliation(s)
- Jiajie Xu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China
| | - Zhiyu Liu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China
| | - Tenghui Jin
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China
| | - Xusheng Yang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China
| | - Huihuang Chen
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China
| | - J Paul Chen
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China.
| |
Collapse
|
3
|
Yang Y, Tang S, Chen JP. Carbon capture and utilization by algae with high concentration CO 2 or bicarbonate as carbon source. Sci Total Environ 2024; 918:170325. [PMID: 38278265 DOI: 10.1016/j.scitotenv.2024.170325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 01/18/2024] [Accepted: 01/19/2024] [Indexed: 01/28/2024]
Abstract
Algae plays a key role in carbon capture and utilization (CCU) as it can capture and use the atmospheric CO2 for conversion of value-added products. Concentrated CO2 is common in flue gas and provides opportunities for algae cultivation. The drawbacks are mass transfer limitation, poor CO2 dissolution, and challenges to reach optimal levels for algal growth at given flue gas levels. Bicarbonate is flexible to be used as carbon source and owns the potential to enhance the efficiency of biological carbon fixation by algae. The requirements of algae strains are more stringent. To improve the industrial scale-up of CCU, system optimization is of great importance. More novel algal strains that can grow rapidly under harsh environment and provide valuable bio-products should be developed for large-scale production. Algae-driven CCU is promising for achieving carbon-neutrality.
Collapse
Affiliation(s)
- Yi Yang
- Faculty of Arts and Sciences/ College of Education for the Future, Beijing Normal University, Zhuhai 519087, PR China; Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge, Singapore.
| | - Shuo Tang
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, PR China
| | - J Paul Chen
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China; Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge, Singapore.
| |
Collapse
|
4
|
Wang LQ, Dong BH, Chen JP. [Two cases of acute freon poisoning]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2023; 41:852-854. [PMID: 38073215 DOI: 10.3760/cma.j.cn121094-20221117-00547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Freon is widely used in daily life, which is usually absorbed through the respiratory tract and causes clinical manifestations mainly in the cardiovascular system and neurological damage. Now, we analyze the clinical data, diagnosis, treatment and prognosis of two cases of freon poisoning in Affiliated Dongyang People's Hospital of Wenzhou Medical University to improve the clinicians' understanding of freon poisoning and to avoid missed diagnosis and misdiagnosis.
Collapse
Affiliation(s)
- L Q Wang
- Emergency Department, Affiliated Dongyang People's Hospital of Wenzhou Medical University, Jinhua 322100, China
| | - B H Dong
- Emergency Department, Affiliated Dongyang People's Hospital of Wenzhou Medical University, Jinhua 322100, China
| | - J P Chen
- Emergency Department, Affiliated Dongyang People's Hospital of Wenzhou Medical University, Jinhua 322100, China
| |
Collapse
|
5
|
Zhu YJ, Liu ZG, Wen AN, Gao ZX, Qin QZ, Fu XL, Wang Y, Chen JP, Zhao YJ. [Deep learning-assisted construction of three-dimensional face midsagittal plane based on point clouds]. Zhonghua Kou Qiang Yi Xue Za Zhi 2023; 58:1179-1184. [PMID: 37885192 DOI: 10.3760/cma.j.cn112144-20230825-00110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Objective: To establish an intelligent registration algorithm under the framework of original-mirror alignment algorithm to construct three-dimensional(3D) facial midsagittal plane automatically. Dynamic Graph Registration Network (DGRNet) was established to realize the intelligent registration, in order to provide a reference for clinical digital design and analysis. Methods: Two hundred clinical patients without significant facial deformities were collected from October 2020 to October 2022 at Peking University School and Hospital of Stomatology. The DGRNet consists of constructing the feature vectors of key points in point original and mirror point clouds (X, Y), obtaining the correspondence of key points, and calculating the rotation and translation by singular value decomposition. Original and mirror point clouds were registrated and united. The principal component analysis (PCA) algorithm was used to obtain the DGRNet alignment midsagittal plane. The model was evaluated based on the coefficient of determination (R2) index for the translation and rotation matrix of test set. The angle error was evaluated on the 3D facial midsagittal plane constructed by the DGRNet alignment midsagittal plane and the iterative closet point(ICP) alignment midsagittal plane for 50 cases of clinical facial data. Results: The average angle error of the DGRNet alignment midsagittal plane and ICP alignment midsagittal plane was 1.05°±0.56°, and the minimum angle error was only 0.13°. The successful detection rate was 78%(39/50) within 1.50° and 90% (45/50)within 2.00°. Conclusions: This study proposes a new solution for the construction of 3D facial midsagittal plane based on the DGRNet alignment method with intelligent registration, which can improve the efficiency and effectiveness of treatment to some extent.
Collapse
Affiliation(s)
- Y J Zhu
- Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - Z G Liu
- School of Computer Science, Beijing University of Posts and Telecommunications National Pilot Software Engineering School & Key Laboratory of Trustworthy Distributed Computing and Service, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
| | - A N Wen
- Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - Z X Gao
- Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - Q Z Qin
- Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - X L Fu
- School of Computer Science, Beijing University of Posts and Telecommunications National Pilot Software Engineering School & Key Laboratory of Trustworthy Distributed Computing and Service, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
| | - Y Wang
- Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - J P Chen
- School of Computer Science, Beijing University of Posts and Telecommunications National Pilot Software Engineering School & Key Laboratory of Trustworthy Distributed Computing and Service, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
| | - Y J Zhao
- Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| |
Collapse
|
6
|
Li SX, Ji W, Wei XY, Cui J, Ying YY, Chen JP, Li H, Liu SW. [Effect of health management service for hypertension patients under framework of Basic Public Health Service Project: a regression discontinuity design]. Zhonghua Liu Xing Bing Xue Za Zhi 2023; 44:772-777. [PMID: 37221066 DOI: 10.3760/cma.j.cn112338-20220721-00649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Objective: To evaluate the effect of health management service on hypertension patients (HMSFHP) under the framework of the Basic Public Health Service Project by using regression discontinuity design. Methods: The participants were enrolled from an observational cohort survey in 2015 and followed up was conducted in 2019. The participants with SBP 130-150 mmHg and/or DBP 80-100 mmHg in the baseline survey of the cohort in 2015 were included in the present study. Additionally, we obtained the dates of participants receiving HMSFHP and their blood pressure data from follow-up records, physical examination records and telephone interview. The participants were divided into intervention group and control group based on the cutoff points, i.e. SBP ≥140 mmHg and/or DBP ≥90 mmHg. The local linear regression model were used to estimate the effect of HMSFHP on reducing blood pressure of the participants. Results: After adjusting for age, sex and time length of receiving HMSFHP, the results of the model including participants with 80-100 mmHg for DBP in 2015 indicated that, for the participants who received HMSFHP, the DBP decreased by 6.66 mmHg from 2015 to 2019. For the participants with SBP 130-150 mmHg in 2015, the reduction estimate of the model was -6.17 mmHg, the difference was not significant (P=0.178), suggesting that receiving HMSFHP did not cause change in SBP for the participants who received HMSFHP. Conclusion: Receiving HMSFHP had effect to reduce DBP, and HMSFHP had a positive effect on the control of blood pressure in patients with hypertension.
Collapse
Affiliation(s)
- S X Li
- Department of Chronic and Non-communicable Disease Control and Prevention, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China
| | - W Ji
- Department of Big Data, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China
| | - X Y Wei
- Harris School of Public Policy, The University of Chicago, Chicago, Illinois 60637, USA
| | - J Cui
- Department of Chronic and Non-communicable Disease Control and Prevention, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China
| | - Y Y Ying
- Department of Chronic and Non-communicable Disease Control and Prevention, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China
| | - J P Chen
- Department of Chronic and Non-communicable Disease Control and Prevention, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China
| | - H Li
- Department of Health Promotion, Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, China
| | - S W Liu
- Tobacco Control Office, Chinese Center for Disease Control and Prevention, Beijing 100050, China
| |
Collapse
|
7
|
Hong M, Wang P, Shangguan T, Li GL, Bian RP, He W, Jiang W, Chen JP. [Correction of the pathogenic mutation in the G6PC3 gene by adenine base editing in mutant embryos]. Zhonghua Xue Ye Xue Za Zhi 2023; 44:308-315. [PMID: 37357000 DOI: 10.3760/cma.j.issn.0253-2727.2023.04.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/27/2023]
Abstract
Objective: To determine whether the adenine base editor (ABE7.10) can be used to fix harmful mutations in the human G6PC3 gene. Methods: To investigate the safety of base-edited embryos, off-target analysis by deep sequencing was used to examine the feasibility and editing efficiency of various sgRNA expression vectors. The human HEK293T mutation models and human embryos were also used to test the feasibility and editing efficiency of correction. Results: ①The G6PC3(C295T) mutant cell model was successfully created. ②In the G6PC3(C295T) mutant cell model, three distinct Re-sgRNAs were created and corrected, with base correction efficiency ranging from 8.79% to 19.56% . ③ ABE7.10 could successfully fix mutant bases in the human pathogenic embryo test; however, base editing events had also happened in other locations. ④ With the exception of one noncoding site, which had a high safety rate, deep sequencing analysis revealed that the detection of 32 probable off-target sites was <0.5% . Conclusion: This study proposes a new base correction strategy based on human pathogenic embryos; however, it also produces a certain nontarget site editing, which needs to be further analyzed on the PAM site or editor window.
Collapse
Affiliation(s)
- M Hong
- Guizhou University Medical College, Guiyang 550025, China
| | - P Wang
- Department of Hematology, the First Affiliated Hospital of Army Medical University (Southwest Hospital), Chongqing 400038, China
| | - T Shangguan
- Department of Reproductive Medicine, the First Affiliated Hospital of Army Medical University (Southwest Hospital), Chongqing 400038, China
| | - G L Li
- Department of Reproductive Medicine, Third Affiliated Hospital of Guangzhou Medical University, Guangzhou 510150, China
| | - R P Bian
- Guizhou University Medical College, Guiyang 550025, China
| | - W He
- Department of Reproductive Medicine, the First Affiliated Hospital of Army Medical University (Southwest Hospital), Chongqing 400038, China
| | - W Jiang
- Department of Hematology, the First Affiliated Hospital of Army Medical University (Southwest Hospital), Chongqing 400038, China
| | - J P Chen
- Department of Hematology, the First Affiliated Hospital of Army Medical University (Southwest Hospital), Chongqing 400038, China
| |
Collapse
|
8
|
Chen JP, Wang J, Guo JQ, Guo CB. [Research progress in multi-body system dynamics modeling in stomatology]. Zhonghua Kou Qiang Yi Xue Za Zhi 2023; 58:374-379. [PMID: 37005786 DOI: 10.3760/cma.j.cn112144-20220525-00273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
Abstract
The stomatognathic system is an organic combination of bone, dentition, joints, masticatory muscles and innervation nerves. It is an organ system for the human body to perform mastication, speech, swallowing and other important functions. Due to the complex anatomical structure of stomatognathic system and ethical limitations, it is difficult to directly measure the movement and force by using the biomechanical experimental methods. Multi-body system dynamics is an important tool to study the kinetics and force of a multi-body system, which consists of several objects with relative motion. We can use the method of multi-body system dynamics simulation in engineering to study the movement, soft tissue deformation and force transfer of this complex stomatognathic system. This paper briefly introduces the history and application methods of multi-body system dynamics and the commonly used modeling methods. The application and research progress of multi-body system dynamics modeling methods in the field of stomatology was emphatically summarized, development prospects of current research and difficulties were put forward.
Collapse
Affiliation(s)
- J P Chen
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - J Wang
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - J Q Guo
- MOE Key Laboratory of Dynamics and Control of Flight Vehicle, School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - C B Guo
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| |
Collapse
|
9
|
Wei N, Chen JP, Liu LP. [Attention should be paid to futile recanalization after endovascular treatment in acute ischemic stroke]. Zhonghua Yi Xue Za Zhi 2023; 103:939-945. [PMID: 36990710 DOI: 10.3760/cma.j.cn112137-20221227-02704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
With the accumulation of research evidence and clinical experience, an increasing number of patients benefit from vascular recanalization therapies. Although successful recanalization of the occluded artery has been achieved, neurological deficits persist after endovascular treatment, which defined as"futile reperfusion". Compared with the successful recanalization, successful reperfusion predicts final infarct size and clinical outcome more accurately. At present, the known influencing factors of futile reperfusion include older age, female, high baseline National Institute of Health stroke scale (NIHSS) score, hypertension, diabetes, atrial fibrillation, reperfusion treatment strategy, large infarction core volume, and collateral circulation status. The incidence of futile reperfusion in China is significantly higher than that in western population. However, few studies focused on its mechanism and influencing factors. To date, many clinical studies have attempted to reduce the occurrence of futile recanalization regarding antiplatelet therapy, blood pressure management and treatment process improvement. However, only one effective measure has been achieved in blood pressure management: systolic blood pressure control below 120 mmHg (1 mmHg=0.133 kPa) should be avoided after successful recanalization. Therefore, future studies are warranted to promote the establishment and maintenance of collateral circulation, as well as neuroprotective therapy.
Collapse
Affiliation(s)
- N Wei
- Neurointensive Care Unit, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - J P Chen
- Neurointensive Care Unit, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| | - L P Liu
- Neurointensive Care Unit, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
| |
Collapse
|
10
|
Li R, Chen JP, Freger V. A new fabrication approach for mixed matrix membrane fabricated with interstitially sealed MOF nanoparticles. J Memb Sci 2023. [DOI: 10.1016/j.memsci.2023.121357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
11
|
Zheng RJ, Chen QL, Ma HM, Liu HD, Chen JP, Liang GS, Chen J, Zhang YY, Li S, Guo B, Wang ML, Du M. [Human chorionic gonadotropin-secreting gonadoblastomas in a girl of 45, X Turner syndrome: a case report and literature review]. Zhonghua Er Ke Za Zhi 2022; 60:1202-1206. [PMID: 36319158 DOI: 10.3760/cma.j.cn112140-20220429-00393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Objective: To summarize the experience in diagnosis and treatment of 45, X Turner syndrome (TS) with gonadal Y chromosome mosaicism and bilateral gonadoblastoma (Gb) secreting human chorionic gonadotrophin(HCG). Methods: A female patient aged 5 years and 3 months was admitted to the hospital with a complaint of "enlarged breasts for 27 months, and elevated blood β-HCG for 8 months". The clinical data were summarized, and related literature up to March 2022 with the key words"Turner syndrome" "Gonadoblastoma" "Y chromosome" "human chorionic gonadotropin" "precocious" in PubMed, CNKI and Wanfang databases were reviewed. Results: The girl went to the local hospital for 2-month breast development at age of 3 years, and was found with a heart murmur diagnosed with "pulmonary venous malformation and atrial septal defect (secondary foramen type)". Surgical correction was performed. She experienced the progressive breast development, rapid linear growth and markedly advanced skeletal age, which cannot be explained by partial activation in the hypothalamic-pituitary-gonadal axis determined at the age of 3 years and 7 months in local hospital. Then whole-exome sequencing revealed chromosome number abnormality 45, X, which was confirmed by Karyotyping. At the age of 4 years and 6 months, serum β-HCG was found to be elevated (24.9 U/L) with no lesion found at the local hospital. On physical examination, she was found with breast development, pubic hair development and clitoromegaly with elevated serum testosterone (1.96 μg/L) and β-HCG (32.3 U/L). Sex determining region Y(SRY) gene was negative in peripheral blood sample. Thoracic and abdominal CT, head and pelvic magnetic resonance imaging were normal. Exploratory laparotomy confirmed the presence of a left adnexal tumor and a right fibrous streak gonad. During surgery, simultaneous samples of bilateral gonadal and peripheral venous blood were obtained and serum β-HCG, estradiol and testosteron concentrations was higher to lower from left gonadal venous blood, right gonadal venous blood, to peripheral venous blood. Bilateral gonadectomy was performed. Histopathology revealed bilateral gonadoblastomas. SRY was positive in bilateral gonadal tissues. After surgery, serum E2, testerone and β-HCG returned to normal. So far 4 cases of HCG-secreting gonadoblastoma had been reported worldwide. The phenotypes of the 4 cases were all female, with virilization or amenorrhea, and the preoperative peripheral blood β-HCG concentrations were 74.4, 5.0, 40 456.0, and 42.4 U/L, respectively. Conclusions: There is a high risk of Gb in TS with Y chromosome components. Gb is infrequently presented with breast development, and Gb associated with HCG secretion is rare. Karyotyping should be performed in a phenotypic female with masculinization, and virilization in TS indicates the presence of Y chromosome material with concurrent androgen secreting tumors.
Collapse
Affiliation(s)
- R J Zheng
- Department of Pediatrics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Q L Chen
- Department of Pediatrics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - H M Ma
- Department of Pediatrics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - H D Liu
- Department of Pediatric Surgery,the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - J P Chen
- Department of Pediatric Surgery,the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - G S Liang
- Department of Medical Laboratory, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - J Chen
- Department of Pediatrics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Y Y Zhang
- Department of Pediatrics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - S Li
- Department of Pediatrics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - B Guo
- Department of Pediatrics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - M L Wang
- Department of Pediatrics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| | - Minlian Du
- Department of Pediatrics, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510080, China
| |
Collapse
|
12
|
Yuan B, Huang X, Yang S, Yang Y, Lin Z, Semiat R, Paul Chen J. Development of a magnetic calcium-alginate hydrogel-sphere encapsulated with Fe–Mn–Zr ternary metal composite for heavy metal adsorption. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
13
|
Yang Y, Xu R, Zheng C, Long Y, Tang S, Sun Z, Huang B, Chen JP. Hierarchical hollow zeolite fiber in catalytic applications: A critical review. Chemosphere 2022; 307:135899. [PMID: 35934099 DOI: 10.1016/j.chemosphere.2022.135899] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 07/28/2022] [Accepted: 07/29/2022] [Indexed: 06/15/2023]
Abstract
Zeolites have widely been studied because of the better performance as catalysts and supports. However, the zeolites with only micropores have drawbacks in reactivity and selectivity due to limitation of diffusivity. The hollow zeolite fibers (HZF) with hierarchical porosity however can overcome the problem. The HZF can be synthesized by such methods as incorporated substrate removal method, solid-solid transformation method, co-axial electrospinning technology, dry-wet spinning technology, and hollow fiber incorporation method. The unique hierarchical porous structure leads to the great improvement in the diffusion efficiency of reactants. The catalytic zeolite membrane fibers are the most commonly used as they have stronger catalyst stability and higher catalytic selectivity. The HZFs are suitable in catalytic applications such as selective catalysis, CO preferential oxidation, air purification and wastewater treatment. In order that the HZFs can be applied to industrial operations, more research work should be carried out, such as developments of self-assembly pure HZFs, catalytic substrate incorporated HZFs, HZFs with gradient multicomponent zeolites and HZFs with nanoscale diameters.
Collapse
Affiliation(s)
- Yi Yang
- College of Education for the Future, Beijing Normal University, Zhuhai, 519087, PR China; Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore; College of Arts and Sciences, Beijing Normal University, Zhuhai, 519087, PR China.
| | - Ruikun Xu
- College of Arts and Sciences, Beijing Normal University, Zhuhai, 519087, PR China
| | - Chenyang Zheng
- College of Arts and Sciences, Beijing Normal University, Zhuhai, 519087, PR China
| | - Yuxi Long
- College of Arts and Sciences, Beijing Normal University, Zhuhai, 519087, PR China
| | - Shuo Tang
- School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, PR China
| | - Zemin Sun
- College of Arts and Sciences, Beijing Normal University, Zhuhai, 519087, PR China; Center for Advanced Materials Research, Beijing Normal University, Zhuhai, 519087, PR China
| | - Binbin Huang
- College of Education for the Future, Beijing Normal University, Zhuhai, 519087, PR China; College of Arts and Sciences, Beijing Normal University, Zhuhai, 519087, PR China
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore.
| |
Collapse
|
14
|
Wang Z, Koh KY, Yang Y, Chen JP. Design and optimization of an innovative lanthanum/chitosan bead for efficient phosphate removal and study of process performance and mechanisms. Chemosphere 2022; 306:135468. [PMID: 35760134 DOI: 10.1016/j.chemosphere.2022.135468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 05/28/2022] [Accepted: 06/21/2022] [Indexed: 06/15/2023]
Abstract
Presence of excessive phosphorus in surface waters is the main cause for eutrophication. In this study, a lanthanum/chitosan (La/CS) bead was prepared so as to provide a cost-effective solution to the problem. The optimization of bead for the treatment was conducted, leading to the optimal condition: 30 wt% La/CS bead at a dosage of 30 g L-1 (wet weight). A higher phosphate removal around 90% was obtained in pH 4.0-10.0. Most of uptake occurred in the first 2 h and the equilibrium was reached in about 6 h. Coexisting ions of Cl-, [Formula: see text] , [Formula: see text] , and [Formula: see text] had negligible effects on the treatment, while the presence of F- reduced the uptake by 10.39%. The maximum adsorption capacity of 261.1 mg-PO4·g-1 (dried weight) at pH 5.0 was achieved, which is much better than many reported La-based adsorbents. The adsorbed phosphate can be effectively recovered with an alkaline solution. A multi-cycle regeneration-reuse study illustrated that the treated water still met the phosphorus discharge standard. The characterization results demonstrated the disappearance of La(OH)3 and La2(CO3)3 on the bead and the formation of NH3+ … P and La-P groups after the adsorption, indicating the significant roles of ion exchange and electrostatic attraction on the uptake. The excellent performance found in this study clearly indicates that the optimized La/CS bead is promising in the treatment of phosphate and perhaps its recovery for industrial use.
Collapse
Affiliation(s)
- Zhuoyao Wang
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore
| | - Kok Yuen Koh
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore
| | - Yi Yang
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore; College of Education for the Future and College of Art and Science, Beijing Normal University, Zhuhai, 519087, China
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore.
| |
Collapse
|
15
|
He J, Fu X, Ni F, Yang G, Deng S, Chen JP, Shen F. Quantitative assessment of interactions of hydrophilic organic contaminants with microplastics in natural water environment. Water Res 2022; 224:119024. [PMID: 36099764 DOI: 10.1016/j.watres.2022.119024] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 08/19/2022] [Accepted: 08/24/2022] [Indexed: 06/15/2023]
Abstract
The interaction between microplastics (MPs) and hydrophilic organic contaminants (HOCs) in natural water environment has recently raised great public attentions due to the potential toxicity to humans. However, the quantitative assessment is less studied. In this study, the interaction between ciprofloxacin (CIP) and ofloxacin (OFL) (two important HOCs) and virgin and aged polystyrene (PS) was investigated. The aged PS showed higher adsorption rate and capacity than the virgin PS, due to its larger surface area and more O-containing groups. The pH-dependent adsorption of CIP was higher than OFL on both virgin and aged PS; the maximum adsorption for both HOCs occurred at pH 5. The sequential orders of functional groups for the adsorption were discovered according to the study by the 2D correlation Fourier transform infrared spectroscopy. Several mechanisms existed for the interaction: (1) at 3.0 < pH < 5.0, the electrostatic attraction (EA) was inhibited while H-bond (HB) was dominant, accounting for > 60% of the total uptake; (2) at 5.0 < pH < 8.0, the contribution of EA increased to around 50-60% while HB decreased to 30-40%; (3) at 8.0 < pH < 10.0, EA, HB and π-π conjugation caused 30-40%, 25-40% and 20-45% of the total uptake, respectively; (4) at 10.0 < pH < 12.0, π-π conjugation accounted for 90-100%. Notably, higher adsorption of CIP was mainly attributed to the presence of secondary amino groups and its higher pKa value, correspondingly leading to the additional ordinary HB and negative charge-assisted HB, and EA interactions with PS. This study further provides clear evidences on the risk of MPs and HOCs on humans and aqueous living organisms.
Collapse
Affiliation(s)
- Jinsong He
- Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China; College of Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Xiao Fu
- Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China; College of Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Fan Ni
- Department of Chemical Engineering, Northwest Minzu University, Lanzhou, Gansu 730030, China
| | - Gang Yang
- Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China; College of Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Shihuai Deng
- Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China; College of Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - J Paul Chen
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, China; Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge, 119260, Singapore.
| | - Fei Shen
- Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China; College of Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China.
| |
Collapse
|
16
|
Wang C, Jiang A, Liu X, Yuen Koh K, Yang Y, Chen JP, Li K. Amorphous metal-organic framework UiO-66-NO2 for removal of oxyanion pollutants: Towards improved performance and effective reusability. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
17
|
Dong BH, Chen JP. [Portal venous gas caused by bactevemia of clostridium perfringens in Crohn's disease: a case report]. Zhonghua Nei Ke Za Zhi 2022; 61:809-810. [PMID: 35764567 DOI: 10.3760/cma.j.cn112138-20210916-00647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Affiliation(s)
- B H Dong
- Department of Emergency, Dongyang People's Hospital, Dongyang 322100, China
| | - J P Chen
- Department of Emergency, Dongyang People's Hospital, Dongyang 322100, China
| |
Collapse
|
18
|
Koh KY, Chen Z, Lin S, Chandra Mohan K, Luo X, Chen JP. Leaching of organic matters and formation of disinfection by-product as a result of presence of microplastics in natural freshwaters. Chemosphere 2022; 299:134300. [PMID: 35288183 DOI: 10.1016/j.chemosphere.2022.134300] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 03/08/2022] [Accepted: 03/09/2022] [Indexed: 06/14/2023]
Abstract
Microplastics (MPs) are ubiquitous in the environment that may cause negative impacts on the aquatic organisms and human health. They exist in water and wastewater, which are from several sources, such as inappropriate disposal and littering. Therefore, it is important to evaluate the characteristics of MPs in different water types and oxidation processes and study dissolved organic carbon (DOC) leaching and chloroform formation. A commonly existing plastic matter, polyethylene (PE) was placed in different waters and gone through the Fenton-like reaction and the chlorination. The result showed that the PE leached nearly a similar amount of DOC (<1 mg L-1), which was regardless of the water types and under low-dosed irradiation/dark environment. The leached DOC caused the chloroform formation after the chlorination in the waters. During the Fenton-like reaction with the PE, a higher amount of leached DOC (∼3 mg L-1) was detected compared with that in the chlorination (∼0.8 mg L-1). The degree of DOC leaching from the PE caused by the oxidation processes was reflected by the degree of surface structural damage on the PE. However, the chlorination resulted in a higher chloroform formation from the PE (∼20 μg L-1) as the Fenton-like reaction degraded the chloroform. The higher the sodium hypochlorite concentration, the higher the chloroform concentration. When the chloroform existed in the water with the PE, adsorption of chloroform onto the PE was initially observed; however the rate of volatilization would be higher than the rate of adsorption eventually. This study offers useful information for the risk assessment of MPs in our fresh water and drinking water and possible mitigation strategies.
Collapse
Affiliation(s)
- Kok Yuen Koh
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, 117411, Singapore
| | - Zhihao Chen
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, 117411, Singapore
| | - Shihan Lin
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore
| | - Kishan Chandra Mohan
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore
| | - Xiaohong Luo
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, 117411, Singapore
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, 117411, Singapore.
| |
Collapse
|
19
|
Liu X, Chen JP, Wang L, Shao Z, Xiao X. Editorial: Microplastics and Microorganisms in the Environment. Front Microbiol 2022; 13:947286. [PMID: 35836412 PMCID: PMC9274285 DOI: 10.3389/fmicb.2022.947286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 05/25/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
- Xianhua Liu
- School of Environmental Science and Engineering, Tianjin University, Tianjin, China
- *Correspondence: Xianhua Liu
| | - J. Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, Singapore, Singapore
| | - Lei Wang
- College of Environmental Science and Engineering, Nankai University, Tianjin, China
| | - Zongze Shao
- Third Research Institute of the Ministry of Natural Resources, Xiamen, China
| | - Xiang Xiao
- School of Oceanography, Shanghai Jiao Tong University, Shanghai, China
| |
Collapse
|
20
|
Ruan WC, Li J, Zhang YJ, Zheng SS, Wang D, Yu H, Chen JP, Bao YY, Shao L, Fu LL, Zou Y, Hua J, Li HF. [Investigate developmental coordination disorder of kindergarten children in Zhejiang Province]. Zhonghua Yu Fang Yi Xue Za Zhi 2022; 56:838-842. [PMID: 35785866 DOI: 10.3760/cma.j.cn112150-20210719-00691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In order to investigate developmental coordination disorder (DCD) of kindergarten children in Zhejiang province, 200 ordinary kindergartens were randomly selected by stratified random sampling in 11 prefecture-level cities of Zhejiang Province, and 38 900 children from 1 000 classes in each grade were then randomly selected into the study from June 2019 to December 2019. The Little DCD Questionnaire and a self-designed questionnaire were used to screen the DCD of those children. There were 36 807 valid questionnaires, and 6.50% (2 391/36 807) of them were positive results. The results showed that boy, age ≤5 years, overweight or obesity, left handedness, comorbidity with motor or developmental disorders and premature infants were risk factors of DCD in children. As for parents and families, maternal gestational age<20 years, maternal overweight or obesity before pregnancy, low-middle level education of parents, direct family and low income of family were also associated with DCD in children. Therefore, it is necessary to conduct early prevention and intervention strategies targeting on identified risk factors among relevant population.
Collapse
Affiliation(s)
- W C Ruan
- Department of Rehabilitation, the Children's Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - J Li
- Jiaxing Maternity and Child Health Care Hospital, Jiaxing 314050, China
| | - Y J Zhang
- The Second People's Hospital of Haining, Haining 314419, China
| | - S S Zheng
- Wenling Women's and Children's Hospital, Wenling 317599, China
| | - D Wang
- Yiwu Maternity and Children Hospital, Yiwu 322099, China
| | - H Yu
- Shaoxing Maternity and Child Health Care Hospital, Shaoxing 312099, China
| | - J P Chen
- The Women and Children Hospital of Dongyang, Dongyang 322199, China
| | - Y Y Bao
- Kindergarten of Hangzhou Normal University, Hangzhou 310012, China
| | - L Shao
- Jinhua Maternal and Child Health Care Hospital, Jinhua 321099, China
| | - L L Fu
- Pujiang Maternity and Child Health Care Hospital, Pujiang 322299, China
| | - Y Zou
- Zhejiang Center for Disease Control and Prevention, Hangzhou 310057, China
| | - J Hua
- Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai 200040, China
| | - H F Li
- Department of Rehabilitation, the Children's Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| |
Collapse
|
21
|
Shan S, Chen Z, Yuen Koh K, Cui F, Paul Chen J. Development and application of lanthanum peroxide loaded sepiolite nanocomposites for simultaneous removal of phosphate and inhibition of cyanobacteria growth. J Colloid Interface Sci 2022; 624:691-703. [DOI: 10.1016/j.jcis.2022.05.152] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Revised: 05/10/2022] [Accepted: 05/27/2022] [Indexed: 12/14/2022]
|
22
|
Lin Z, Tang J, Huang X, Chen JP. Gadolinium(III) terephthalate metal-organic framework for rapid sequestration of phosphate in 10 min: Material development and adsorption study. Chemosphere 2022; 292:133498. [PMID: 34979208 DOI: 10.1016/j.chemosphere.2021.133498] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 12/28/2021] [Accepted: 12/30/2021] [Indexed: 06/14/2023]
Abstract
Phosphorus with concentration above a few ppm in waters can easily cause eutrophication and poor water quality (e.g. algal blooming). In this study, we synthesized a non-porous gadolinium terephthalic acid (Gd-PTA) metal-organic framework (MOF) for efficient and rapid removal of phosphorus. Gd-PTA was prepared with gadolinium as the core metal center and terephthalic acid as the organic ligand, by which a well defined structure of new MOF was established. The adsorption isotherm and kinetics were well described by Langmuir isotherm equation and the intraparticle surface diffusion model, respectively. The maximum adsorption capacity was as high as 206.13- PO43- mg/g, which outperforms many reported and/or commercially available adsorbents (normmaly 5-150 PO43- mg/g). The adsorption was completed at the end of 10-min contact time, much faster than many reported adsorbents for uptake of anions (normmaly hours to days). The MOF performed very well in the uptake in phosphate containing solution with initial pH 3 to 9 and ionic strength (NaNO3) of 0-1 M, and in the presences of competiting sulphate, nitrate, carbonate and humic acid (each with 30, 50, and 100 mg/L). The absorption of phosphate was mainly controlled by ion exchange between phosphate and organic ligand of MOF as well as the interaction between unsaturated metal center of coordination and phosphate. This study demonstrates that the newly developed MOF reported here is a promising adsorbent for cost-effective treatment of phosphorus in water and wastewater.
Collapse
Affiliation(s)
- Zhihong Lin
- Chemistry and Chemical Engineering Guangdong Laboratory, Guangdong, China; Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong, China
| | - Jiali Tang
- Chemistry and Chemical Engineering Guangdong Laboratory, Guangdong, China; Technion-Israel Institute of Technology, Department of Chemical Engineering, Haifa, Israel
| | - Xiaochun Huang
- Chemistry and Chemical Engineering Guangdong Laboratory, Guangdong, China; Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong, China
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge, Singapore.
| |
Collapse
|
23
|
Zou SW, Koh KY, Chen Z, Wang YY, Chen JP, Zheng YM. Adsorption of organic and inorganic arsenic from aqueous solution: Optimization, characterization and performance of Fe-Mn-Zr ternary magnetic sorbent. Chemosphere 2022; 288:132634. [PMID: 34699882 DOI: 10.1016/j.chemosphere.2021.132634] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 10/09/2021] [Accepted: 10/19/2021] [Indexed: 06/13/2023]
Abstract
Arsenic is a highly toxic pollutant and exists in inorganic and organic forms in groundwater and industrial wastewater. It is of great importance to reduce the arsenic content to lower levels in the water (e.g., <10 ppb for drinking) in order to minimize risk to humans. In this study, a Fe-Mn-Zr ternary magnetic sorbent was fabricated via precipitation for removal of inorganic and organic arsenate. The synthesis of sorbent was optimized by Taguchi method, which leads to an adsorbent with higher adsorption capacity. The adsorption of As(V) was pH dependent; the optimal removal was achieved at pH 2 and 5 for inorganic and organic As(V), respectively. Contact time of 25 h was sufficient for complete adsorption of both inorganic and organic As(V). The adsorption isotherm study revealed that the adsorbent performed better in sequestration of inorganic As(V) than that of organic As(V); both adsorption followed the Langmuir isotherm with maximum adsorption capacities of 81.3 and 16.98 mg g-1 for inorganic and organic As(V), respectively. The existence of anions in the water had more profound effect on the adsorption of organic As(V) than the inorganic As(V). The co-existing silicate and phosphate ions caused significantly negative impacts on the adsorption of both As(V). Furthermore, the existence of humic acid caused the deterioration of inorganic As(V) removal but showed insignificant impact on the organic As(V) adsorption. The mechanism study demonstrated that ion exchange and complexation played key roles in arsenic removal. This study provides a promising magnetic adsorptive material for simultaneous removal of inorganic and organic As(V).
Collapse
Affiliation(s)
- Shuai-Wen Zou
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore; Shanghai Emperor of Cleaning Hi-tech Limited Company, 1230 North Zhongshan Road, Shanghai, 200437, China
| | - Kok Yuen Koh
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore
| | - Zhihao Chen
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore
| | - Yu-Yang Wang
- Shanghai Emperor of Cleaning Hi-tech Limited Company, 1230 North Zhongshan Road, Shanghai, 200437, China
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore; NUS Graduate School - Integrative Sciences and Engineering Programme, National University of Singapore, Singapore 21 Lower Kent Ridge Road, Singapore, 119077, Singapore.
| | - Yu-Ming Zheng
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore; CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
| |
Collapse
|
24
|
Chen Z, Chen M, Koh KY, Neo W, Ong CN, Chen JP. An optimized CaO 2-functionalized alginate bead for simultaneous and efficient removal of phosphorous and harmful cyanobacteria. Sci Total Environ 2022; 806:150382. [PMID: 34571230 DOI: 10.1016/j.scitotenv.2021.150382] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 08/29/2021] [Accepted: 09/13/2021] [Indexed: 06/13/2023]
Abstract
Simultaneous removal of phosphorus (P) and algae is important to mitigate eutrophication, however, it is rather challenging in remediation of harmful algal blooms (HABs)-contaminated water. In this study, a wet alginate bead functionalized by CaO2 particle formed layer by layer was prepared with an in-situ method and optimized to remove phosphorous and inhibit algae growth. The stable H2O2 release with a concentration level of 0.06 mM was observed for a period of 26 d. The content of peroxy groups (-O-O-) in the optimal bead was 0.44 mmol·g-1 through permanganate-based titration study. For solution with an initial phosphorous concentration of 10 mg·L-1, the removal was around 97% in pH 3.0-10.0. XRD, SEM, and XPS studies and kinetic modelings showed that removal of phosphorus was mainly due to formation of insoluble Ca-P compounds in the bead. The CaO2-functionalized bead inhibited algae growth with an effect lasting over 170 d, which was much better than liquid H2O2 and Ca(OH)2 bead; the phosphorous removal with an efficiency of about 70% was simultaneously obtained. Furthermore, the bead demonstrated to be effective in removing algae in the realistic water from a reservoir. In summary, this study shows that the CaO2-functionalized material is promising for simultaneous removal of phosphorous and management of HABs.
Collapse
Affiliation(s)
- Zhihao Chen
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore.
| | - Meiqing Chen
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore; School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Kok Yuen Koh
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore; Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore
| | - Wenyang Neo
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore
| | - Choon Nam Ong
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore; Saw Swee Hock School of Public Health, 12 Science Drive 2, National University of Singapore, Singapore, 117549, Singapore
| | - J Paul Chen
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore; Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore.
| |
Collapse
|
25
|
Koh KY, Chen Z, Zhang S, Chen JP. Cost-effective phosphorus removal from aqueous solution by a chitosan/lanthanum hydrogel bead: Material development, characterization of uptake process and investigation of mechanisms. Chemosphere 2022; 286:131458. [PMID: 34284222 DOI: 10.1016/j.chemosphere.2021.131458] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 06/30/2021] [Accepted: 07/05/2021] [Indexed: 06/13/2023]
Abstract
Excessive phosphorus is one of the main reasons leading to eutrophication that causes severe ecosystem imbalance and negative human health impacts. In this study, several chitosan (CS)/lanthanum (La) hydrogel beads were first synthesized and tested for phosphorus removal. The stable cross-linked CS/La hydrogel bead prepared with the optimized conditions of 10 wt% La/CS and 1.5 mL of 5% glutaraldehyde demonstrated exceptional performance in the removal. It removed phosphate effectively from an aqueous solution in the pH range from 2 to 7. The complete phosphate uptake was achieved at contact time of 6 h under the completely mixing batch condition. The experimental maximum adsorption capacity of 107.7 mg g-1 was observed at solution pH 4. The phosphate adsorption was well described by the Freundlich isotherm and the intraparticle surface diffusion model. Furthermore, the adsorbent was effectively regenerated and reused in a five-cycle adsorption-desorption operation. The removal of phosphate can be attributed to electrostatic attraction and ion exchange. Moreover, the bead was capable of removing heavy metals: copper, zinc and lead. This adsorbent may be served as a cost-effective material for the treatment of phosphorus-contaminated water so as to minimize the occurrence of eutrophication.
Collapse
Affiliation(s)
- Kok Yuen Koh
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore.
| | - Zhihao Chen
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore
| | - Sui Zhang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117576, Singapore
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore.
| |
Collapse
|
26
|
Zhang LY, Su J, He JJ, Wiescher M, deBoer RJ, Kahl D, Chen YJ, Li XY, Wang JG, Zhang L, Cao FQ, Zhang H, Zhang ZC, Jiao TY, Sheng YD, Wang LH, Song LY, Jiang XZ, Li ZM, Li ET, Wang S, Lian G, Li ZH, Tang XD, Zhao HW, Sun LT, Wu Q, Li JQ, Cui BQ, Chen LH, Ma RG, Guo B, Xu SW, Li JY, Qi NC, Sun WL, Guo XY, Zhang P, Chen YH, Zhou Y, Zhou JF, He JR, Shang CS, Li MC, Zhou XH, Zhang YH, Zhang FS, Hu ZG, Xu HS, Chen JP, Liu WP. Direct Measurement of the Astrophysical ^{19}F(p,αγ)^{16}O Reaction in the Deepest Operational Underground Laboratory. Phys Rev Lett 2021; 127:152702. [PMID: 34678013 DOI: 10.1103/physrevlett.127.152702] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 08/01/2021] [Accepted: 08/24/2021] [Indexed: 06/13/2023]
Abstract
Fluorine is one of the most interesting elements in nuclear astrophysics, where the ^{19}F(p,α)^{16}O reaction is of crucial importance for Galactic ^{19}F abundances and CNO cycle loss in first generation Population III stars. As a day-one campaign at the Jinping Underground Nuclear Astrophysics experimental facility, we report direct measurements of the essential ^{19}F(p,αγ)^{16}O reaction channel. The γ-ray yields were measured over E_{c.m.}=72.4-344 keV, covering the Gamow window; our energy of 72.4 keV is unprecedentedly low, reported here for the first time. The experiment was performed under the extremely low cosmic-ray-induced background environment of the China JinPing Underground Laboratory, one of the deepest underground laboratories in the world. The present low-energy S factors deviate significantly from previous theoretical predictions, and the uncertainties are significantly reduced. The thermonuclear ^{19}F(p,αγ)^{16}O reaction rate has been determined directly at the relevant astrophysical energies.
Collapse
Affiliation(s)
- L Y Zhang
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - J Su
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - J J He
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - M Wiescher
- Department of Physics and The Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - R J deBoer
- Department of Physics and The Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - D Kahl
- Extreme Light Infrastructure-Nuclear Physics, Horia Hulubei National Institute for Research and Development in Physics and Nuclear Engineering (IFIN-HH), Bucharest-Măgurele 077125, Romania
| | - Y J Chen
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - X Y Li
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - J G Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L Zhang
- China Institute of Atomic Energy, Beijing 102413, China
| | - F Q Cao
- China Institute of Atomic Energy, Beijing 102413, China
| | - H Zhang
- China Institute of Atomic Energy, Beijing 102413, China
| | - Z C Zhang
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - T Y Jiao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Y D Sheng
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - L H Wang
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - L Y Song
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - X Z Jiang
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - Z M Li
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - E T Li
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - S Wang
- Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
| | - G Lian
- China Institute of Atomic Energy, Beijing 102413, China
| | - Z H Li
- China Institute of Atomic Energy, Beijing 102413, China
| | - X D Tang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Q Wu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J Q Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - B Q Cui
- China Institute of Atomic Energy, Beijing 102413, China
| | - L H Chen
- China Institute of Atomic Energy, Beijing 102413, China
| | - R G Ma
- China Institute of Atomic Energy, Beijing 102413, China
| | - B Guo
- China Institute of Atomic Energy, Beijing 102413, China
| | - S W Xu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J Y Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - N C Qi
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - W L Sun
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - X Y Guo
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - P Zhang
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - Y H Chen
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - Y Zhou
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - J F Zhou
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - J R He
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - C S Shang
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - M C Li
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - X H Zhou
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Y H Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - F S Zhang
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - Z G Hu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H S Xu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J P Chen
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - W P Liu
- China Institute of Atomic Energy, Beijing 102413, China
| |
Collapse
|
27
|
Chen Z, Li J, Chen M, Koh KY, Du Z, Gin KYH, He Y, Ong CN, Chen JP. Microcystis aeruginosa removal by peroxides of hydrogen peroxide, peroxymonosulfate and peroxydisulfate without additional activators. Water Res 2021; 201:117263. [PMID: 34126472 DOI: 10.1016/j.watres.2021.117263] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 05/11/2021] [Accepted: 05/12/2021] [Indexed: 06/12/2023]
Abstract
Harmful algal bloom (HAB) is one of the most globally severe challenges in ecological system and water safety. Hydrogen peroxide has been commonly used in the management/treatment. Solid oxidants (e.g., peroxymonosulfate (PMS) and peroxydisulfate (PDS)) may outperform liquid H2O2 due to ease in transportation, handling, and applications. However, the information on applications of PMS and PDS in algae treatment is limited. In this study, the two solid peroxides and H2O2 were investigated for the removal of the blue-green algae of Microcystis aeruginosa. H2O2 and PMS effectively removed algae in 2 d at pH 5.0, 7.0 and 9.0, while PDS was only effective at pH 5.0. The change in pH and the release of dissolved organic carbon were insignificant at 0.2 mM H2O2 and PMS. The PMS could degrade microcystin-LR and phycobiliproteins. The studies of phycobiliproteins degradation and scanning electron microscopy indicated that PMS might cause the cell inactivation mainly by damaging the chemical components in algae cell wall and membrane while H2O2 might mainly enter the cell to form oxidation pressure to kill algae. The scavenger experiments showed that radicals were not crucial in H2O2 and PDS applications. Similarly, the algae removal by PMS was obtained mainly by non-radical pathways; about 77% was direct PMS oxidation and no more than 3% was singlet oxygen-mediated process, while radical pathways of sulfate radical and hydroxyl radical accounted for 18% and 2%, respectively. For the realistic algae-contaminated natural water, the PMS effectively lasted for 60 d, while the H2O2 lasted for 12 d. This research work demonstrates that the PMS is promising in control of HAB. The findings can provide some useful design and application parameters of PMS technology for better management/treatment of algae-contaminated water.
Collapse
Affiliation(s)
- Zhihao Chen
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore
| | - Jingyi Li
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore; Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore; Sichuan Cancer Hospital & Institute, No. 55, Section 4, South Renmin Road, Chengdu, China
| | - Meiqing Chen
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore
| | - Kok Yuen Koh
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore; Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore
| | - Zhongrong Du
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore
| | - Karina Yew-Hoong Gin
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore; Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore
| | - Yiliang He
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Choon Nam Ong
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore; Saw Swee Hock School of Public Health, 12 Science Drive 2, National University of Singapore, Singapore, 117549, Singapore
| | - J Paul Chen
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore; Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore.
| |
Collapse
|
28
|
Chen M, Chen Z, Wu P, Chen JP. Simultaneous oxidation and removal of arsenite by Fe(III)/CaO 2 Fenton-like technology. Water Res 2021; 201:117312. [PMID: 34146764 DOI: 10.1016/j.watres.2021.117312] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 04/26/2021] [Accepted: 05/25/2021] [Indexed: 06/12/2023]
Abstract
Arsenite contaminated water is one of severe global environmental problems. It is challenging to treat As(III) pollution by a one-step technology. In this study, we developed a Fe(III)/CaO2 Fenton-like technology for the treatment of As(III). The simultaneous oxidation of arsenite and removal of arsenic were achieved with efficiencies of nearly 100% and 95.8% respectively, which outperforms conventional technologies. It worked well in pH 3 to 9, and in the presence of cationic heavy metals, anions and humic acid. Moreover, the PO43- inhibited the removal of As(III). •OH and 1O2 played the important roles in the oxidation of As(III). The Ca(II) derived from CaO2 made a significant contribution to the oxidation and removal of As(III). The SEM and XPS studies confirmed that the formation of Ca-Fe nascent colloid caused the effective removal of arsenic. Our study demonstrates that the one-step Fe(III)/CaO2 technology has a great potential for purification of the As(III)-contaminated water.
Collapse
Affiliation(s)
- Meiqing Chen
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Zhihao Chen
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore.
| |
Collapse
|
29
|
Meng W, Lao L, Zhang ZJ, Lin WL, Zhang YB, Yeung WF, Yu YMB, Ng HYE, Chen JP, Su J, Rong JH, Lam PYF, Lee E. Tumour-shrinking decoction for symptomatic uterine fibroids: a double-blind, randomised, two-dose trial (abridged secondary publication). Hong Kong Med J 2021; 27 Suppl 2:8-10. [PMID: 34075883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023] Open
Affiliation(s)
- W Meng
- LKS Faculty of Medicine, The University of Hong Kong
| | - L Lao
- LKS Faculty of Medicine, The University of Hong Kong
| | - Z J Zhang
- LKS Faculty of Medicine, The University of Hong Kong
| | - W L Lin
- Hong Kong Institute of Integrative Medicine, Faculty of Medicine, The Chinese University of Hong Kong
| | - Y B Zhang
- LKS Faculty of Medicine, The University of Hong Kong
| | - W F Yeung
- School of Nursing, The Hong Kong Polytechnic University
| | - Y M B Yu
- School of Nursing, The Hong Kong Polytechnic University
| | - H Y E Ng
- LKS Faculty of Medicine, The University of Hong Kong
| | - J P Chen
- LKS Faculty of Medicine, The University of Hong Kong
| | - J Su
- LKS Faculty of Medicine, The University of Hong Kong
| | - J H Rong
- LKS Faculty of Medicine, The University of Hong Kong
| | - P Y F Lam
- LKS Faculty of Medicine, The University of Hong Kong
| | - E Lee
- LKS Faculty of Medicine, The University of Hong Kong
| |
Collapse
|
30
|
Koh KY, Zhang S, Paul Chen J. Incorporation of lanthanum particles to polyethersulfone ultrafiltration membrane for specific phosphorus uptake: Method comparison and performance assessment. J Colloid Interface Sci 2021; 601:242-253. [PMID: 34082229 DOI: 10.1016/j.jcis.2021.05.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 04/26/2021] [Accepted: 05/05/2021] [Indexed: 12/23/2022]
Abstract
It is known that phosphorus is a major contributor to the occurrence of eutrophication. As such, it is of importance to remove it from water. Nanofiltration (NF) has low phosphorus selectivity and requires a relatively high pressure to achieve the separation, though it is capable of removing phosphorus. In this paper, we report our findings of method development on fabrication and application of a lanthanum (La)-incorporated polyethersulfone (PES)/sulfonated polyphenylenesulfone membrane for phosphorus treatment. The performances of membranes fabricated by the in situ and ex situ methods were examined in a series of batch adsorption and dead-end filtration experiments. The membrane fabricated by the in situ method demonstrated higher adsorption capacity (48.0 mg/g), faster kinetics (equilibrium in 6 h) and higher water permeance (>100 LMH/bar), which outperformed that by the ex situ method. Furthermore, the PES/La (in situ) membrane showed a comparable phosphate removal with a much higher permeance (about 20 times) than the NF90 (a nanofiltration commercial membrane). Moreover, the multiple cycles of filtration study showed that the membrane was reused satisfactorily in treating low-phosphate contaminated water and meeting the stringent phosphate standard limit of 0.15 mg/L. The removal of phosphate by the membranes was attributed to the mechanisms of ion exchange and electrostatic attraction/complexation. The study reported here provides a better approach in fabrication of functionalized membrane for water treatment, such as phosphate removal in either batch adsorption or membrane filtration process.
Collapse
Affiliation(s)
- Kok Yuen Koh
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore
| | - Sui Zhang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117576, Singapore.
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
| |
Collapse
|
31
|
Yu Y, Yang Y, Yu L, Koh KY, Chen JP. Modification of polyvinylidene fluoride membrane by silver nanoparticles-graphene oxide hybrid nanosheet for effective membrane biofouling mitigation. Chemosphere 2021; 268:129187. [PMID: 33360934 DOI: 10.1016/j.chemosphere.2020.129187] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 11/27/2020] [Accepted: 12/01/2020] [Indexed: 05/09/2023]
Abstract
Membrane biofouling poses severe impacts on the membrane lifespan and performance. In this study, a silver nanoparticles-graphene oxide hybrid nanosheet (AgNPs-GO) was synthesized as a bactericidal agent for effective membrane biofouling mitigation. The surface polymerization between polyvinyl alcohol (PVA) and AgNPs-GO nanosheet improved the stability of inorganic biocidal materials on the membrane surface and had a significant effect on the permeability and rejection performance of membranes. The PVA/AgNPs-GO modified hydrophilic polyvinylidene fluoride (H-PVDF) membrane exhibited an excellent anti-microbial activity in both static contact and filtration modes; nearly 100% inactivation of Pseudomonas aeruginosa in solution and 91% reduction in the membrane surface adhesion were found. The composite membrane with good stability and anti-microbial ability may offer an alternative to alleviate membrane biofouling problem.
Collapse
Affiliation(s)
- Yang Yu
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore; Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou, 511443, China
| | - Yi Yang
- NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore
| | - Ling Yu
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore
| | - Kok Yuen Koh
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore; NUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore, 117411, Singapore.
| |
Collapse
|
32
|
Bhetuwal D, Matter J, Szumila-Vance H, Kabir ML, Dutta D, Ent R, Abrams D, Ahmed Z, Aljawrneh B, Alsalmi S, Ambrose R, Androic D, Armstrong W, Asaturyan A, Assumin-Gyimah K, Ayerbe Gayoso C, Bandari A, Basnet S, Berdnikov V, Bhatt H, Biswas D, Boeglin WU, Bosted P, Brash E, Bukhari MHS, Chen H, Chen JP, Chen M, Christy EM, Covrig S, Craycraft K, Danagoulian S, Day D, Diefenthaler M, Dlamini M, Dunne J, Duran B, Evans R, Fenker H, Fomin N, Fuchey E, Gaskell D, Gautam TN, Gonzalez FA, Hansen JO, Hauenstein F, Hernandez AV, Horn T, Huber GM, Jones MK, Joosten S, Karki A, Keppel C, Khanal A, King PM, Kinney E, Ko HS, Kohl M, Lashley-Colthirst N, Li S, Li WB, Liyanage AH, Mack D, Malace S, Markowitz P, Meekins D, Michaels R, Mkrtchyan A, Mkrtchyan H, Nazeer SJ, Nanda S, Niculescu G, Niculescu I, Nguyen D, Pandey B, Park S, Pooser E, Puckett A, Rehfuss M, Reinhold J, Santiesteban N, Sawatzky B, Smith GR, Sun A, Tadevosyan V, Trotta R, Wood SA, Yero C, Zhang J. Ruling out Color Transparency in Quasielastic ^{12}C(e,e^{'}p) up to Q^{2} of 14.2 (GeV/c)^{2}. Phys Rev Lett 2021; 126:082301. [PMID: 33709760 DOI: 10.1103/physrevlett.126.082301] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 12/15/2020] [Accepted: 01/14/2021] [Indexed: 06/12/2023]
Abstract
Quasielastic ^{12}C(e,e^{'}p) scattering was measured at spacelike 4-momentum transfer squared Q^{2}=8, 9.4, 11.4, and 14.2 (GeV/c)^{2}, the highest ever achieved to date. Nuclear transparency for this reaction was extracted by comparing the measured yield to that expected from a plane-wave impulse approximation calculation without any final state interactions. The measured transparency was consistent with no Q^{2} dependence, up to proton momenta of 8.5 GeV/c, ruling out the quantum chromodynamics effect of color transparency at the measured Q^{2} scales in exclusive (e,e^{'}p) reactions. These results impose strict constraints on models of color transparency for protons.
Collapse
Affiliation(s)
- D Bhetuwal
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - J Matter
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - H Szumila-Vance
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - M L Kabir
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - D Dutta
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - R Ent
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - D Abrams
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - Z Ahmed
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
| | - B Aljawrneh
- North Carolina A & T State University, Greensboro, North Carolina 27411, USA
| | - S Alsalmi
- Kent State University, Kent, Ohio 44240, USA
| | - R Ambrose
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
| | - D Androic
- University of Zagreb, Zagreb, Croatia
| | - W Armstrong
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - A Asaturyan
- A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), Yerevan 0036, Armenia
| | - K Assumin-Gyimah
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - C Ayerbe Gayoso
- Mississippi State University, Mississippi State, Mississippi 39762, USA
- The College of William & Mary, Williamsburg, Virginia 23185, USA
| | - A Bandari
- The College of William & Mary, Williamsburg, Virginia 23185, USA
| | - S Basnet
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
| | - V Berdnikov
- Catholic University of America, Washington, DC 20064, USA
| | - H Bhatt
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - D Biswas
- Hampton University, Hampton, Virginia 23669, USA
| | - W U Boeglin
- Florida International University, University Park, Florida 33199, USA
| | - P Bosted
- The College of William & Mary, Williamsburg, Virginia 23185, USA
| | - E Brash
- Christopher Newport University, Newport News, Virginia 23606, USA
| | | | - H Chen
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - J P Chen
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - M Chen
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - E M Christy
- Hampton University, Hampton, Virginia 23669, USA
| | - S Covrig
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - K Craycraft
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - S Danagoulian
- North Carolina A & T State University, Greensboro, North Carolina 27411, USA
| | - D Day
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - M Diefenthaler
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - M Dlamini
- Ohio University, Athens, Ohio 45701, USA
| | - J Dunne
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - B Duran
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - R Evans
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
| | - H Fenker
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - N Fomin
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - E Fuchey
- University of Connecticut, Storrs, Connecticut 06269, USA
| | - D Gaskell
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - T N Gautam
- Hampton University, Hampton, Virginia 23669, USA
| | - F A Gonzalez
- Stony Brook University, Stony Brook, New York 11794, USA
| | - J O Hansen
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - F Hauenstein
- Old Dominion University, Norfolk, Virginia 23529, USA
| | - A V Hernandez
- Catholic University of America, Washington, DC 20064, USA
| | - T Horn
- Catholic University of America, Washington, DC 20064, USA
| | - G M Huber
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
| | - M K Jones
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - S Joosten
- Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - A Karki
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - C Keppel
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - A Khanal
- Florida International University, University Park, Florida 33199, USA
| | - P M King
- Ohio University, Athens, Ohio 45701, USA
| | - E Kinney
- University of Colorado Boulder, Boulder, Colorado 80309, USA
| | - H S Ko
- Institut de Physique Nucleaire, Orsay, France
| | - M Kohl
- Hampton University, Hampton, Virginia 23669, USA
| | | | - S Li
- University of New Hampshire, Durham, New Hampshire 03824, USA
| | - W B Li
- The College of William & Mary, Williamsburg, Virginia 23185, USA
| | - A H Liyanage
- Hampton University, Hampton, Virginia 23669, USA
| | - D Mack
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - S Malace
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - P Markowitz
- Florida International University, University Park, Florida 33199, USA
| | - D Meekins
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - R Michaels
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - A Mkrtchyan
- A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), Yerevan 0036, Armenia
| | - H Mkrtchyan
- A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), Yerevan 0036, Armenia
| | - S J Nazeer
- Hampton University, Hampton, Virginia 23669, USA
| | - S Nanda
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - G Niculescu
- James Madison University, Harrisonburg, Virginia 22807, USA
| | - I Niculescu
- James Madison University, Harrisonburg, Virginia 22807, USA
| | - D Nguyen
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - B Pandey
- Hampton University, Hampton, Virginia 23669, USA
| | - S Park
- Stony Brook University, Stony Brook, New York 11794, USA
| | - E Pooser
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - A Puckett
- University of Connecticut, Storrs, Connecticut 06269, USA
| | - M Rehfuss
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - J Reinhold
- Florida International University, University Park, Florida 33199, USA
| | - N Santiesteban
- University of New Hampshire, Durham, New Hampshire 03824, USA
| | - B Sawatzky
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - G R Smith
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - A Sun
- Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
| | - V Tadevosyan
- A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), Yerevan 0036, Armenia
| | - R Trotta
- Catholic University of America, Washington, DC 20064, USA
| | - S A Wood
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - C Yero
- Florida International University, University Park, Florida 33199, USA
| | - J Zhang
- Stony Brook University, Stony Brook, New York 11794, USA
| |
Collapse
|
33
|
Yang Y, Koh KY, Huang H, Zhang H, Yan Y, Chen JP. Great enhancement in phosphate uptake onto lanthanum carbonate grafted microfibrous composite under a low-voltage electrostatic field. Chemosphere 2021; 264:128378. [PMID: 33032225 DOI: 10.1016/j.chemosphere.2020.128378] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 09/04/2020] [Accepted: 09/15/2020] [Indexed: 06/11/2023]
Abstract
Removal of phosphorus from water via cost-effective measures becomes important for water industry mainly due to eutrophication in waterbody. In our lab, a novel lanthanum carbonate-microfibrous composite (LC-MC) with good performance was previously synthesized for the removal of phosphorus. In this study, we further improved our technology by applying the electrostatic field (direct current, DC) to the adsorption system. It was showed that the applied DC can greatly improve the adsorption of phosphate in particular the adsorption capacity. Better removal was seen in the pH range of 5-9 at a higher temperature. The maximum adsorption capacity of 47.57 mg-PO43- g-1 was achieved, which was 1.4 times of that operated in the absence of applied DC. The adsorption equilibrium was established at the contact time of 240 min; the adsorption history was well described by the intraparticle surface diffusion model. The negative effect from oxygen-containing anions on the phosphate uptake followed the decreasing sequence of: humic acid > carbonate > nitrate > sulfate; on the other hand, the halogen anions had almost no influence on it. Finally, the mechanism study by XPS, XRD, and IR demonstrated that the ligand exchange played an important role in the electro-assisted phosphate uptake process.
Collapse
Affiliation(s)
- Yi Yang
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore; School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou, 510640, PR China; College of Education for the Future, Beijing Normal University, Zhuhai, 519087, PR China
| | - Kok Yuen Koh
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore
| | - Haoxin Huang
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou, 510640, PR China
| | - Huiping Zhang
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou, 510640, PR China
| | - Ying Yan
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou, 510640, PR China
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore.
| |
Collapse
|
34
|
Yero C, Abrams D, Ahmed Z, Ahmidouch A, Aljawrneh B, Alsalmi S, Ambrose R, Armstrong W, Asaturyan A, Assumin-Gyimah K, Ayerbe Gayoso C, Bandari A, Bane J, Basnet S, Berdnikov VV, Bericic J, Bhatt H, Bhetuwal D, Biswas D, Boeglin WU, Bosted P, Brash E, Bukhari MHS, Chen H, Chen JP, Chen M, Christy ME, Covrig S, Craycraft K, Danagoulian S, Day D, Diefenthaler M, Dlamini M, Dunne J, Duran B, Dutta D, Ent R, Evans R, Fenker H, Fomin N, Fuchey E, Gaskell D, Gautam TN, Gonzalez FA, Hansen JO, Hauenstein F, Hernandez AV, Horn T, Huber GM, Jones MK, Joosten S, Kabir ML, Karki A, Keppel CE, Khanal A, King P, Kinney E, Lashley-Colthirst N, Li S, Li WB, Liyanage AH, Mack DJ, Malace SP, Matter J, Meekins D, Michaels R, Mkrtchyan A, Mkrtchyan H, Nazeer SJ, Nanda S, Niculescu G, Niculescu M, Nguyen D, Nuruzzaman N, Pandey B, Park S, Perdrisat CF, Pooser E, Rehfuss M, Reinhold J, Sawatzky B, Smith GR, Sun A, Szumila-Vance H, Tadevosyan V, Wood SA, Zhang J. Probing the Deuteron at Very Large Internal Momenta. Phys Rev Lett 2020; 125:262501. [PMID: 33449750 DOI: 10.1103/physrevlett.125.262501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 10/27/2020] [Accepted: 12/02/2020] [Indexed: 06/12/2023]
Abstract
We measure ^{2}H(e,e^{'}p)n cross sections at 4-momentum transfers of Q^{2}=4.5±0.5 (GeV/c)^{2} over a range of neutron recoil momenta p_{r}, reaching up to ∼1.0 GeV/c. We obtain data at fixed neutron recoil angles θ_{nq}=35°, 45°, and 75° with respect to the 3-momentum transfer q[over →]. The new data agree well with previous data, which reached p_{r}∼500 MeV/c. At θ_{nq}=35° and 45°, final state interactions, meson exchange currents, and isobar currents are suppressed and the plane wave impulse approximation provides the dominant cross section contribution. We compare the new data to recent theoretical calculations, where we observe a significant discrepancy for recoil momenta p_{r}>700 MeV/c.
Collapse
Affiliation(s)
- C Yero
- Florida International University, University Park, Florida 33199, USA
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - D Abrams
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - Z Ahmed
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
| | - A Ahmidouch
- North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27411, USA
| | - B Aljawrneh
- North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27411, USA
| | - S Alsalmi
- Kent State University, Kent, Ohio 44240, USA
| | - R Ambrose
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
| | - W Armstrong
- Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - A Asaturyan
- A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), 2 Alikhanian Brothers Street, 0036, Yerevan, Armenia
| | - K Assumin-Gyimah
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - C Ayerbe Gayoso
- College of William & Mary, Williamsburg, Virginia 23185, USA
| | - A Bandari
- College of William & Mary, Williamsburg, Virginia 23185, USA
| | - J Bane
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - S Basnet
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
| | - V V Berdnikov
- Catholic University of America, Washington, D.C. 20064, USA
| | - J Bericic
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - H Bhatt
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - D Bhetuwal
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - D Biswas
- Hampton University, Hampton, Virginia 23669, USA
| | - W U Boeglin
- Florida International University, University Park, Florida 33199, USA
| | - P Bosted
- College of William & Mary, Williamsburg, Virginia 23185, USA
| | - E Brash
- Christopher Newport University, Newport News, Virginia 23606, USA
| | | | - H Chen
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - J P Chen
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - M Chen
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - M E Christy
- Hampton University, Hampton, Virginia 23669, USA
| | - S Covrig
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - K Craycraft
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - S Danagoulian
- North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27411, USA
| | - D Day
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - M Diefenthaler
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - M Dlamini
- Ohio University, Athens, Ohio 45701, USA
| | - J Dunne
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - B Duran
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - D Dutta
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - R Ent
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - R Evans
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
| | - H Fenker
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - N Fomin
- University of Tennessee, Knoxville, Tennessee 37996, USA
| | - E Fuchey
- University of Connecticut, Storrs, Connecticut 06269, USA
| | - D Gaskell
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - T N Gautam
- Hampton University, Hampton, Virginia 23669, USA
| | - F A Gonzalez
- Stony Brook University, Stony Brook, New York 11794, USA
| | - J O Hansen
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - F Hauenstein
- Old Dominion University, Norfolk, Virginia 23529, USA
| | - A V Hernandez
- Catholic University of America, Washington, D.C. 20064, USA
| | - T Horn
- Catholic University of America, Washington, D.C. 20064, USA
| | - G M Huber
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
| | - M K Jones
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - S Joosten
- Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - M L Kabir
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - A Karki
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - C E Keppel
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - A Khanal
- Florida International University, University Park, Florida 33199, USA
| | - P King
- Ohio University, Athens, Ohio 45701, USA
| | - E Kinney
- University of Colorado Boulder, Boulder, Colorado 80309, USA
| | | | - S Li
- University of New Hampshire, Durham, New Hampshire 03824, USA
| | - W B Li
- College of William & Mary, Williamsburg, Virginia 23185, USA
| | - A H Liyanage
- Hampton University, Hampton, Virginia 23669, USA
| | - D J Mack
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - S P Malace
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - J Matter
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - D Meekins
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - R Michaels
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - A Mkrtchyan
- A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), 2 Alikhanian Brothers Street, 0036, Yerevan, Armenia
| | - H Mkrtchyan
- A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), 2 Alikhanian Brothers Street, 0036, Yerevan, Armenia
| | - S J Nazeer
- Hampton University, Hampton, Virginia 23669, USA
| | - S Nanda
- Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - G Niculescu
- James Madison University, Harrisonburg, Virginia 22807, USA
| | - M Niculescu
- James Madison University, Harrisonburg, Virginia 22807, USA
| | - D Nguyen
- University of Virginia, Charlottesville, Virginia 22903, USA
| | - N Nuruzzaman
- Rutgers University, New Brunswick, New Jersey 08854, USA
| | - B Pandey
- Hampton University, Hampton, Virginia 23669, USA
| | - S Park
- Stony Brook University, Stony Brook, New York 11794, USA
| | - C F Perdrisat
- College of William & Mary, Williamsburg, Virginia 23185, USA
| | - E Pooser
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - M Rehfuss
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - J Reinhold
- Florida International University, University Park, Florida 33199, USA
| | - B Sawatzky
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - G R Smith
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - A Sun
- Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
| | - H Szumila-Vance
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - V Tadevosyan
- A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), 2 Alikhanian Brothers Street, 0036, Yerevan, Armenia
| | - S A Wood
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - J Zhang
- Stony Brook University, Stony Brook, New York 11794, USA
| |
Collapse
|
35
|
Chen JP, Han Y, Miao H, Ou ZJ, Mao CJ, Liu CF. [Effects of sleep quality and mood of patients with Parkinson's disease on their caregivers]. Zhonghua Yi Xue Za Zhi 2020; 100:3414-3418. [PMID: 33238671 DOI: 10.3760/cma.j.cn112137-20200225-00444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Objectve: To evaluate the relationship of Parkinson's disease(PD) patients' sleep quality and depression with burden, quality of life, and depression of their caregivers. Methods: A total of 120 PD patients (68 males and 52 females) and their caregivers (48 males and 72 females) from Changshu Hospital Affiliated to Nanjing University of Chinese Medicine between January 2017 and June 2019 were recruited. Patients' sleep quality, depression and quality of life was evaluated. Burden, quality of life, quality of sleep, and depression of caregivers were assessed by the Caregivers Burden Questionnaire (CBI), Health Survey Brief (SF-36), Pittsburgh Sleep Quality Index (PQS1) and Hamilton Depression Scale (HAMD), meanwhile, the correlation between relevant factors was analyzed. Results: The CBI of caregivers was positively correlated with the unified Parkinson's disease rating scale (UPDRS)-Ⅲ scores of PD patients (r=0.436, P<0.05). The CBI, SF-36GH, SF-36MH, HAMD and PSQI scores of caregivers were positively correlated with Parkinson's disease sleep scale (PDSS) scores of PD patients (r=0.546, 0.762, 0.528, 0.562 and 0.522, respectively, all P<0.01). The caregiver's CBI score was positively correlated with PD patients' Epworth sleepiness score (ESS) score (r=0.442, P<0.05), and caregiver's CBI, SF-36GH, SF-36MH, HAMD, PSQI scores were positively correlated with PD patients' HAMD scores (r=0.765, 0.813, 0.635, 0.884 and 0.601, respectively, all P<0.01). The caregiver's CBI score was positively correlated with the PDQ-39 score of PD patients (r=0.834, 0.452, 0.463, 0.421 and 0.387, respectively, all P<0.05). Multiple regression analysis indicated that the caregiver's CBI score was significantly correlated with the patient's PDQ-39, PDSS and HAMD scores (r=0.512, 0.645 and 0.635, respectively, all P<0.01), and the caregiver's SF-36GH score was significantly correlated with the patient's PDQ-39, PDSS and HAMD scores (r=0.452, 0.682 and 0.506, respectively, all P<0.01). The caregiver's SF-36MH score was significantly correlated with the patient's PDQ-39, PDSS and HAMD scores (r=0.426, 0.608 and 0.598, respectively, all P<0.01). There was significant correlations between the caregiver's HAMD score and the patient's PDSS and HAMD scores (r=0.568 and 0.496, both P<0.01), and the PSQI score of the caregiver was significantly correlated with the PDSS and HAMD scores of the patient (r=0.532 and 0.461, both P<0.01). Conclusions: This current study underscores the presence of a significant relationship of patient's sleep quality with caregiver's burden, quality of life, depression and sleep quality. Specifically, sleep quality and depression of the patients are independent predictors for burden, quality of life and sleep quality of the caregivers.
Collapse
Affiliation(s)
- J P Chen
- Department of Neurology, Changshu Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu 215500, China
| | - Y Han
- Department of Neurology, Changshu Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu 215500, China
| | - H Miao
- Department of Neurology, Changshu Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu 215500, China
| | - Z J Ou
- Department of Neurology, Changshu Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu 215500, China
| | - C J Mao
- Department of Neurology, the Second Affiliated Hospital of Soochow University, Suzhou 215004, China
| | - C F Liu
- Department of Neurology, the Second Affiliated Hospital of Soochow University, Suzhou 215004, China
| |
Collapse
|
36
|
Abstract
The aim of the study was to explore the effect of lipoxin A4 (LXA4) on lung injury in sepsis rats through the p38/mitogen-activated protein kinase (MAPK) signaling pathway. Sprague-Dawley rats were used for the study. The rat model of sepsis-induced acute lung injury was established via cecal ligation (Sepsis group, n=20). LXA4 (0.1 mg/kg) was injected at 6 h after modeling (Treatment group, n=20), and a The Control group (n=20) was also set up. The 7-day survival rate was 100% in The Control group, and LXA4 raised the survival rate of rats in the Sepsis group from 40% to 60% (P<0.01). Alveolar fluid clearance (AFC) significantly declined and the wet/dry weight (W/D) ratio of lung tissues rose remarkably in the Sepsis group compared with those in the Control group, while LXA4 restored AFC and reduced the W/D ratio of lung tissues (P<0.05), suggesting that LXA4 treatment reduces lung fluids and partially enhances AFC, thus lowering the W/D ratio of lung. The total cell count, polymorphonuclear neutrophils (PMN) percentage and concentration of tumor necrosis factor-α (TNF-α) and interleukin (IL)-6 in bronchoalveolar lavage fluid (BALF) were obviously increased in the Sepsis group compared with those in the Control group, while they were markedly decreased in the Treatment group (P<0.05). The activity of myeloperoxidase (MPO) in lung tissue homogenate was evidently higher in the Sepsis group than that in The Control group, while it was notably lower in the Treatment group than that in the Sepsis group after LXA4 treatment (P<0.05). Moreover, it was observed microscopically that the morphology of lung tissues was intact in the Control group. Finally, the results of Western blotting manifested that the p-p38/ MAPK protein expression was remarkably increased in the Sepsis group, indicating the activation of the p38/MAPK pathway, while it was remarkably decreased in the Treatment group, indicating the inhibited activity of the pathway (P<0.05). LXA4 has an anti-inflammatory effect on sepsis rats with lung injury, and such effect is related to the p38/MAPK signaling pathway.
Collapse
Affiliation(s)
- X H Hu
- Department of ICU, Shanghai Xuhui District Central Hospital, Shanghai, China
| | - H L Situ
- Department of Galactophore, The Second Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine, Guangzhou, Guangdong Province, China
| | - J P Chen
- Health Care Center, Shanghai University of Medicine & Health Sciences, Shanghai, China
| | - R H Yu
- Department of Respiratory Medicine, Shanghai Xuhui District Central Hospital, Shanghai, China
| |
Collapse
|
37
|
Lu B, Liu RJ, Meng B, Yuan H, Zhai XJ, Li XY, Qin JL, Zheng JW, Wu GR, Chen JP. [Effect of fragmented sleep on postoperative cognitive function and central neuroinflammation]. Zhonghua Yi Xue Za Zhi 2020; 100:1341-1344. [PMID: 32375444 DOI: 10.3760/cma.j.cn112137-20191215-02734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effect of sleep fragmentation on perioperative neurocognitive disorders (PND) and central neuroinflammation by simulating sleep patterns of postoperative patients with sleep fragmentation in aged mice. Methods: Thirty-two elderly ICR mice were randomly divided into four groups (n=8): normal group (C), surgery group (S), fragmented sleep group (F), and surgery+fragmented sleep group (D). Fragmented sleep was conducted after internal fixation of tibia fractures, cognitive function was evaluated by novel object recognition (NOR) and fear conditioning (FC) test, and changes in expression of inflammatory cytokines in hippocampus were detected by ELISA. Results: NOR test: the recognition index (RI) of mice in group C, group S, group F and group D was 0.69±0.07, 0.48±0.07, 0.54±0.10 and 0.50±0.12, respectively. The RI of mice in group S, group F and group D was significantly lower than that in group C (t=4.885, 3.521 and 4.433, all P<0.01). There was no significant difference in RI between group S and group D (t=0.967 1, P>0.05). Contextual FC test: the freezing time of mice in group C, group S, group F and group D was(21.34±6.48), (13.83±4.26), (11.50±6.25) and (6.17±4.77) s, respectively. The freezing time of mice in group S, group F and group D was significantly lower than that in group C (t=2.722, 3.566, 5.496, P<0.05 or P<0.01). The freezing time of mice in group D was significantly lower than that in group S (t=2.774, P<0.05). Cue FC test: the freezing time of mice in group C, group S, group F and group D was (74.36±17.09), (43.91±9.71), (46.34±13.43) and (24.90±14.21) s, respectively. The freezing time of mice in group S, group F and group D was significantly lower than that in group C (t=4.393, 4.043 and 7.136, all P<0.01). The freezing time of mice in group D was significantly lower than that in group S (t=2.743, P<0.05). The levels of TNF-α, IL-6 and IL-1β in hippocampus of mice in group S, F and D were significantly higher than those in group C, while the levels of TNF-α and IL-6 in hippocampus of mice in group D were significantly higher than those in group S, with statistically significant differences (P<0.05 or P<0.01). Conclusion: Postoperative fragmented sleep aggravates postoperative cognitive impairment and increases the hippocampal neuroinflammation in aged mice.
Collapse
Affiliation(s)
- B Lu
- Department of Anesthesiology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo 315010, China
| | - R J Liu
- Department of Anesthesiology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo 315010, China
| | - B Meng
- Department of Anesthesiology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo 315010, China
| | - H Yuan
- Department of Anesthesiology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo 315010, China
| | - X J Zhai
- Department of Anesthesiology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo 315010, China
| | - X Y Li
- Department of Anesthesiology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo 315010, China
| | - J L Qin
- Department of Anesthesiology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo 315010, China
| | - J W Zheng
- Department of Anesthesiology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo 315010, China
| | - G R Wu
- Department of Anesthesiology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo 315010, China
| | - J P Chen
- Department of Anesthesiology, Hwa Mei Hospital, University of Chinese Academy of Sciences, Ningbo 315010, China
| |
Collapse
|
38
|
Yang Y, Yuen Koh K, Li R, Zhang H, Yan Y, Chen JP. An innovative lanthanum carbonate grafted microfibrous composite for phosphate adsorption in wastewater. J Hazard Mater 2020; 392:121952. [PMID: 32155516 DOI: 10.1016/j.jhazmat.2019.121952] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Revised: 11/28/2019] [Accepted: 12/21/2019] [Indexed: 06/10/2023]
Abstract
Excessive presence of phosphorus in waters can cause eutrophication, a global unsolved environmental problem that has caused harmful effects to our eco-system and the source of our drinking water. In the study presented in this paper, a novel lanthanum carbonate grafted microfibrous composite (LC-MC) adsorbent was synthesized aiming at removing large amount of phosphate in wastewater efficiently. An optimized LC-MC was firstly prepared. The most suitable pH for the phosphate uptake was pH 7 to 9. The adsorption showed similar behavior in a wide range of ionic strength. The presence of co-existing anions was proved to have a less significant effect on the removal. The adsorption isotherm data were better fitted by the Freundlich isotherm than the Langmuir isotherm. The equilibrium was reached at about 300 min of contact time. 80 % of original adsorption capacity can be achieved even after 5 cycles of adsorption- desorption operations, indicating great regenerative performance of the adsorbent. The adsorption mechanism study showed that the ligand exchange played a key role during the phosphate adsorption.
Collapse
Affiliation(s)
- Yi Yang
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore; School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou, 510640, PR China
| | - Kok Yuen Koh
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore
| | - Ruiying Li
- Technion-Israel Institute of Technology, Department of Chemical Engineering, Haifa, 3200, Israel; Guangdong Technion-Israel Institute of Technology, 243 Da Xue Road, Shantou, Guangdong, China
| | - Huiping Zhang
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou, 510640, PR China
| | - Ying Yan
- School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou, 510640, PR China
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, Kent Ridge Crescent, Singapore, 119260, Singapore.
| |
Collapse
|
39
|
Zhang WH, Yang K, Chen XZ, Liu K, Chen XL, Zhao LY, Zhang B, Chen ZX, Chen JP, Zhou ZG, Hu JK. [Effect of standardized surgical treatment and multidisciplinary treatment strategy on the prognosis of gastric cancer patients: report of a single-center cohort study]. Zhonghua Wei Chang Wai Ke Za Zhi 2020; 23:396-404. [PMID: 32306609 DOI: 10.3760/cma.j.cn.441530-20200224-00086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Objective: To explore the effect of standardized surgical treatment and multidisciplinary treatment strategy on the treatment outcomes of gastric cancer patients. Methods: A single-center cohort study was carried out. Clinicopathological and long-term follow up data of primary gastric cancer patients were retrieved from the database of Surgical Gastric Cancer Patient Registry (SGCPR) in West China Hospital of Sichuan University. Finally, 4516 gastric cancer patients were included and were divided into three groups according to time periods (period 1 group: exploration stage of standardized surgical treatment, 2000 to 2006, 967 cases; period 2 group: application stage of standardized surgical treatment, 2007 to 2012, 1962 cases; period 3 group: optimization stage of standardized surgical treatment and application stage of multidisciplinary treatment strategy, 2013 to 2016, 1587 cases). Differences in clinical data, pathologic features, and prognosis were compared among 3 period groups. Follow-up information was updated to January 1, 2020. The overall follow-up rate was 88.9% (4016/4516) and median follow-up duration was 51.58 months. Survival curve was drawn by Kaplan-Meire method and compared with log-rank test. Univariate and multivariate analyses were performed by Cox proportional hazards model. Results: There were significant differences among period 1, period 2 and period 3 groups in the rates of D2/D2+ lymphadenectomy [14.4%(139/967) vs. 47.2%(927/1962) vs. 75.4%(1197/1587), χ(2)=907.210, P<0.001], in the ratio of proximal gastrectomy [19.8%(191/967) vs. 16.6%(325/1962) vs. 8.2%(130/1587), χ(2)=100.020, P<0.001], and in the median intraoperative blood loss (300 ml vs. 100 ml vs. 100 ml, H=1126.500, P<0.001). Besides, the increasing trend and significant difference were also observed in the median number of examined lymph nodes among period 1, period 2 and period 3 groups (14 vs. 26 vs. 30, H=987.100, P<0.001). Survival analysis showed that the 5-year overall survival rate was 55.3% in period 1, 55.2% in period 2 and 62.8% in period 3, and significant difference existed between period 3 and period 1 (P=0.004). The Cox proportional hazards model analysis showed that treatment period (period 3, HR=0.820, 95%CI: 0.708 to 0.950, P=0.008), postoperative chemotherapy (HR=0.696, 95%CI: 0.631 to 0.768, P<0.001) and mid-low gastric cancer (HR=0.884, 95%CI: 0.804 to 0.973, P=0.011) were good prognostic factors. Whereas old age (≥65 years, HR=1.189, 95%CI: 1.084 to 1.303, P<0.001), palliative resection (R1/R2, HR=1.538,95%CI: 1.333 to 1.776, P<0.001), large tumor size (≥5 cm, HR=1.377, 95%CI: 1.239 to 1.529, P<0.001), macroscopic type III to IV (HR=1.165, 95%CI: 1.063 to 1.277, P<0.001) and TNM stage II to IV(II/I:HR=1.801,95%CI:1.500~2.162,P<0.001;III/I:HR=3.588, 95%CI: 3.028~4.251, P<0.001; IV/I: HR=6.114, 95%CI: 4.973~7.516, P<0.001) were independent prognostic risk factors. Conclusion: Through the implementation of standardized surgical treatment technology and multidisciplinary treatment model, the quality of surgery treatment and overall survival increase, and prognosis of gastric cancer patients has been improved.
Collapse
Affiliation(s)
- W H Zhang
- Department of Gastrointestinal Surgery, Laboratory of Gastric Cancer, West China Hospital, Chengdu 610041, China
| | - K Yang
- Department of Gastrointestinal Surgery, Laboratory of Gastric Cancer, West China Hospital, Chengdu 610041, China
| | - X Z Chen
- Department of Gastrointestinal Surgery, Laboratory of Gastric Cancer, West China Hospital, Chengdu 610041, China
| | - K Liu
- Department of Gastrointestinal Surgery, Laboratory of Gastric Cancer, West China Hospital, Chengdu 610041, China
| | - X L Chen
- Department of Gastrointestinal Surgery, Laboratory of Gastric Cancer, West China Hospital, Chengdu 610041, China
| | - L Y Zhao
- Department of Gastrointestinal Surgery, Laboratory of Gastric Cancer, West China Hospital, Chengdu 610041, China
| | - B Zhang
- Department of Gastrointestinal Surgery, Laboratory of Gastric Cancer, West China Hospital, Chengdu 610041, China
| | - Z X Chen
- Department of Gastrointestinal Surgery, Laboratory of Gastric Cancer, West China Hospital, Chengdu 610041, China
| | - J P Chen
- Department of Gastrointestinal Surgery, Laboratory of Gastric Cancer, West China Hospital, Chengdu 610041, China
| | - Z G Zhou
- Department of Gastrointestinal Surgery, Laboratory of Digestive Surgery, West China Hospital, Chengdu 610041, China
| | - J K Hu
- Department of Gastrointestinal Surgery, Laboratory of Gastric Cancer, West China Hospital, Chengdu 610041, China
| |
Collapse
|
40
|
Koh KY, Zhang S, Chen JP. Improvement of Ultrafiltration for Treatment of Phosphorus-Containing Water by a Lanthanum-Modified Aminated Polyacrylonitrile Membrane. ACS Omega 2020; 5:7170-7181. [PMID: 32280857 PMCID: PMC7143425 DOI: 10.1021/acsomega.9b03573] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 02/18/2020] [Indexed: 05/24/2023]
Abstract
Phosphorus contamination in fresh water has posed a great risk to aquatic ecosystems and human health due to extensive eutrophication. In this paper, we are reporting a lanthanum (La)-modified aminated polyacrylonitrile (PAN) adsorptive membrane for effective decontamination of phosphorus from the simulated water. The PAN membrane was first aminated to introduce the amine group as an active site for La and then followed by the in situ precipitation of La particles. The kinetics study showed that the rapid adsorption occurred within the initial 4 h with the equilibrium established at 8 h. The membrane worked well in the acidic pH region, with optimal pH 4 and 5 without and with the pH control, respectively. The maximum adsorption capacities were 50 and 44.64 mg/g at pH 5 and 7, respectively. The adsorption of phosphorus was not affected by the existence of commonly existing anions except fluorides in water. In the filtration study, it was observed that the removal of phosphorus remained the optimum, although the operating pressure was increased from 1 to 3 bar. The modified membrane was able to treat 0.32 L of a 10 mg/L phosphate solution to meet the maximum allowable limit of 0.15 mg/L for the trade effluent. The mechanism study revealed that the removal was primarily associated with the ion exchange between a phosphorus ion and a hydroxyl group from the La particles.
Collapse
Affiliation(s)
- Kok Yuen Koh
- Department
of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
| | - Sui Zhang
- Department
of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117576
| | - J. Paul Chen
- Department
of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
| |
Collapse
|
41
|
Ou ZJ, Huang ZC, Chen JP, Xu JP, Mao XY, You SJ, Liu CF, Cao YJ, Xiao GD. [Clinical analysis of carotid artery stenting with severe stenosis and extracranial distortion under proximal protection technique]. Zhonghua Yi Xue Za Zhi 2019; 99:3568-3573. [PMID: 31826573 DOI: 10.3760/cma.j.issn.0376-2491.2019.45.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the feasibility, efficacy and safety of endovascular reconstruction of the carotid artery with severe stenosis and extracranial distortion under proximal protection. Methods: A retrospective analysis of 21 patients with severe carotid stenosis and extracranial distortion who were admitted to the Second Affiliated Hospital of Soochow University between January 2011 and August 2017, of which 16 patients were symptomatic stenosis with acute ischemic stroke. All the patients were treated with carotid artery stenting under (CAS) proximal protection technique, and assessed with the National Institutes of Health Stroke Scale (NIHSS) before the treatment and hospital discharge. The clinical outcome and vascular morphology were followed-up regularly after the treatment. Results: Twenty-one patients were successfully completed the CAS procedure under the proximal protection technique, the average blocking time was 241.0 (232.5-261.0) seconds. Nine patients received 1block attempt, 6 patients received 2 block attempts, and the other 6 patients received 3 block attempts. Three patients experienced transient ischemic attack (TIA) during the procedure, the maximum duration of TIA was 10 minutes. In 16 patients with symptomatic stenosis, there were no significant differences in NIHSS score before CAS procedure and hospital discharge (P>0.05). The residual stenosis rate of the carotid artery after stenting was(13±6)%, compared with preoperative (87±16)%, which appeared a significant difference (t=19.948, P<0.05). All the patients had no adverse events such as myocardial infarction, recurrent ischemic stroke and death in the follow-up period. Restenosis was assessed in 6 patients by DSA or CTA and no restenosis was found. Conclusion: Endovascular reconstruction of the carotid artery with severe stenosis and extracranial distortion under proximal protection technique has been proven as a safe and effective therapy.
Collapse
Affiliation(s)
- Z J Ou
- Department of Neurology, the Second Affiliated Hospital of Soochow University, Suzhou 215004, China (Ou Zhijie is working in the Department of Neurology, Changshu TCM Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu 215500, China)
| | | | - J P Chen
- Department of Neurology, the Second Affiliated Hospital of Soochow University, Suzhou 215004, China (Chen Juping is working in the Department of Neurology, Changshu TCM Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu 215500, China)
| | | | | | | | | | | | | |
Collapse
|
42
|
Yu L, Ling R, Chen JP, Reinhard M. Quantitative assessment of the iron-catalyzed degradation of a polyamide nanofiltration membrane by hydrogen peroxide. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2019.05.078] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
|
43
|
Meng B, Zhai XJ, Qin JL, Li XY, Lu B, Zheng JW, Chen JP. [Modified memory sub-test of Syndrom Kurz test in middle-aged and elderly Chinese]. Zhonghua Yi Xue Za Zhi 2019; 99:2047-2051. [PMID: 31315375 DOI: 10.3760/cma.j.issn.0376-2491.2019.26.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the applicability of the modified memory sub-test of syndrom kurz test (SKT-M) in middle-aged and elderly Chinese. Methods: Between March 1, 2017, and October 31, 2017, at HwaMei Hospital, 132 patients receiving elective great saphenous vein high ligation and stripping operation and 96 their accompanying dependents, 55-75 years old, were randomly divided into the SKT-M group (n=121) and auditory verbal learning test -huashan version (AVLT-H) group (n=107) using random numeral method. The two groups underwent two corresponding neuropsychological tests respectively on the day before surgery and the second day after surgery. Results: There was no significant difference in the baseline characteristics and all the neuropsychological indices at the two time points between patients and dependents (P>0.05). As a consequence, the data of the patients and dependents were integrated to compare the applicability of SKT-M and AVLT-H. The "low-score" ratio of SKT-M immediate recall (2.4%) was lower than that of AVLT-H test (12.1%) (χ(2)=8.138, P<0.01). Besides, the "low-score" ratio of SKT-M delayed recall (5.7%) was also lower than that of AVLT-H test (20.5%) (χ(2)=11.167, P<0.01). The influence factors of SKT-M were less than that of AVLT-H test. However, the learning effect of SKT-M immediate recall was more significant, for its first testing sore (23.1±5.4) was significantly higher than the second one (21.9±5.1) (t=-3.971, P<0.001). Conclusion: The SKT-M has better applicability to 55-75 years old Chinese than AVLT-H test, but its learning effect should be noted.
Collapse
Affiliation(s)
- B Meng
- Department of Anesthesiology, HwaMei Hospital, University of Chinese Academy of Sciences, Ningbo 315010, China
| | | | | | | | | | | | | |
Collapse
|
44
|
Wang J, Chen JP, Wang Y, Xu XL, Guo CB. [Application of digital mandibular movement record and masticatory muscle electromyography in the evaluation of stomatognathic function in patients with mandibular tumor]. Beijing Da Xue Xue Bao Yi Xue Ban 2019; 51:571-578. [PMID: 31209433 DOI: 10.19723/j.issn.1671-167x.2019.03.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To study the clinical characteristics of mandibular movement and masticatory muscle function in preoperative and postoperative patients with unilateral mandibular tumors in the region of mandibular body and ramus by combining digital mandibular movement records with electromyography, and to preliminarily explore the relationship and mechanism between movement and masticatory muscle function. METHODS Six preoperative patients with tumor in unilateral body and ramus of mandible were included, and three postoperative patients with unilateral segmental resection and reconstruction of mandibular bone were included. The mandibular movement recording system and surface electromyography system were used to collect the movement trajectory of the patients' mandibular marginal movement and chewing movement, and the surface electromyography of bilateral masseter and temporalis was recorded concurrently. The surface electromyography of bilateral masseter and temporalis was collected when the patients were at relaxation and at maximal voluntary clenching (MVC). The motion trajectory was observed on the digital virtual model, and the motion amplitude and direction of mandibular marginal movements were analyzed. The characteristics of masticatory electromyogram (EMG) activity in affected and unaffected sides at relaxation, MVC and bilateral mastication were analyzed, and the asymmetry indexes and activity indexes were calculated. RESULTS The preoperative mean maximum opening of the patients was (35.20±6.87) mm. Three patients had mild mouth opening limitation, and all the patients' mouth opening trajectory was skewed to the affected side. During lateral movements, the mean range of motion of the affected side [(10.34±1.27) mm] and that of the healthy side [(6.94±2.41) mm] were significantly different. The maximum opening of the postoperative patients was (30.65±17.32) mm, and the mandibular marginal movement characteristics were consistent with those of the patients before surgery. During MVC in the preoperative patients, the median EMG activities of the masseter muscle [44.20 (5.70, 197.90) μV] and the temporalis muscle [42.15 (22.90, 155.00) μV] on the affected side were slightly lower than those of the masseter [45.60 (7.50, 235.40) μV] and the temporalis muscle [63.30 (44.10, 126.70) μV] on the healthy side. In the postoperative patients, individualized changes occurred. Some patients suffered from weakened electromyographic activity on the affected side, while some other ones showed hyperelectromyographic activity on the affected side. CONCLUSION Both benign and malignant tumors as well as their surgery can cause abnormal mandibular movements and change of electromyographic activity of bilateral masseter and temporalis muscles.
Collapse
Affiliation(s)
- J Wang
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - J P Chen
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - Y Wang
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - X L Xu
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - C B Guo
- Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| |
Collapse
|
45
|
Chen YP, Yang LM, Paul Chen J, Zheng YM. Electrospun spongy zero-valent iron as excellent electro-Fenton catalyst for enhanced sulfathiazole removal by a combination of adsorption and electro-catalytic oxidation. J Hazard Mater 2019; 371:576-585. [PMID: 30878908 DOI: 10.1016/j.jhazmat.2019.03.043] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 02/24/2019] [Accepted: 03/09/2019] [Indexed: 06/09/2023]
Abstract
In this study, a highly active electro-Fenton catalyst, spongy zero-valent iron (ZVI), has been developed at first via in-situ synthesis of ZVI nanoparticles (NPs) on an electrospun three-dimensional (3D) nanofiber network. The spongy ZVI effectively overcame the defects of easy aggregation of ZVI NPs and ferric sludge accumulation during the electro-catalytic process. Then, a three-dimensional electro-Fenton (3D-EF) system using the as-fabricated spongy ZVI as particle catalytic electrodes was designed, which presented a significant synergistic effect of adsorption and electro-catalytic oxidation on the enhanced removal of a widely used antibiotic, sulfathiazole (STZ) from water. Adsorption experiments demonstrated that the spongy ZVI had a relative high adsorption affinity towards STZ with about 50% of the total removal within 240 min, and the adsorption equilibrium was reached in 570 min. Hydroxyl radical (OH) was produced in the 3D-EF system with spongy ZVI catalyst, and almost 100% STZ was removed within 5 min. Reactive oxygen species analysis verified that OH was mainly responsible for the STZ degradation. Based on intermediates identified by a liquid chromatography-tandem mass spectrometry (LC-MS/MS), three pathways for the electro-Fenton oxidative degradation of STZ were proposed.
Collapse
Affiliation(s)
- Yi-Ping Chen
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen 361021, China; University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China; College of Resources and Environment, Quanzhou Normal University, 398 Donghai Road, Quanzhou 362000, China
| | - Li-Ming Yang
- Faculty of Engineering, National University of Singapore, 21 Lower Kent Ridge Road, 119077, Singapore
| | - J Paul Chen
- Faculty of Engineering, National University of Singapore, 21 Lower Kent Ridge Road, 119077, Singapore
| | - Yu-Ming Zheng
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen 361021, China; University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China; CAS Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, China.
| |
Collapse
|
46
|
|
47
|
Koh KY, Wang C, Chen JP. A new adsorbent of gadolinium-1,4-benzenedicarboxylate composite for better phosphorous removal in aqueous solutions. J Colloid Interface Sci 2019; 543:343-351. [DOI: 10.1016/j.jcis.2019.02.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 02/02/2019] [Accepted: 02/04/2019] [Indexed: 11/16/2022]
|
48
|
Yang SN, Pu X, Xiang SL, Chen JP, Pei L. [Brain derived neurotrophic factor enhances the role of mesenchymal stem cells in inhibiting follicular helper T cells]. Zhonghua Xue Ye Xue Za Zhi 2019; 39:37-40. [PMID: 29551031 PMCID: PMC7343120 DOI: 10.3760/cma.j.issn.0253-2727.2018.01.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
目的 探讨脑源性神经营养因子(BDNF)增强间充质干细胞(MSC)抑制滤泡辅助性T细胞(Tfh细胞)的作用及机制。 方法 ELISA法检测MSC培养上清中吲哚胺2,3-二加氧酶(IDO)、IL-10、TGF-β和IL-21的含量;采集健康志愿者的外周血标本,采用人淋巴细胞分离液分离外周血中的淋巴细胞;采用Transwell小室进行MSC和淋巴细胞共培养,流式细胞术检测CD4+CXCR5+ Tfh细胞及其亚群的比例。 结果 ①BDNF组(BDNF刺激的MSC)培养上清IL-10、TGF-β、IDO浓度均高于对照组(加入等体积磷酸盐缓冲液)[IL-10:(42.1±4.4)ng/ml对(19.3±2.1)ng/ml,t=4.761,P=0.009;TGF-β:(13.9±1.7)ng/ml对(5.3±0.6)ng/ml,t=5.129,P=0.008;IDO:(441.3±56.9)ng/ml对(226.7±37.6)ng/ml,t=3.130,P=0.035];②BDNF组(淋巴细胞与BDNF刺激的MSC共培养)与MSC组(淋巴细胞与MSC共培养)比较:CD4+CXCR5+Tfh细胞比例降低[(3.37±0.21)%对(6.51±0.27)%,t=9.353,P<0.001],CD4+ CXCR5+ CXCR3+ CCR6−Tfh1细胞比例升高[(41.14±2.04)%对(26.72±2.57)%,t=4.383,P=0.012],CD4+CXCR5+CXCR3−CCR6−Tfh2细胞和CD4+CXCR5+CXCR3−CCR6+Tfh17细胞比例降低[Tfh2:(30.16±5.38)%对(43.26±4.11)%,t=4.426,P=0.012;Tfh17:(15.61±1.52)%对(22.32±0.72)%,t=4.202,P=0.014],CD4+CXCR5+Foxp3+ Tfr细胞比例升高[(4.95±0.22)%对(2.32±0.16)%,t=10.241,P<0.001],淋巴细胞培养上清中IL-21浓度降低[(0.28±0.03)ng/ml对(0.85±0.08)ng/ml,t=6.675,P=0.003]。 结论 BDNF能够增强MSC抑制Tfh细胞的作用,机制是抑制淋巴细胞中Tfh细胞比例升高及其向Tfh2和Tfh17亚群的分化。
Collapse
Affiliation(s)
- S N Yang
- Department of Hematology, Southwest Hospital, Army Medical University, Chongqing 400038, China
| | | | | | | | | |
Collapse
|
49
|
Yu L, Yu Y, Li J, Chen JP. Development and characterization of yttrium-ferric binary composite for treatment of highly concentrated arsenate wastewater. J Hazard Mater 2019; 361:348-356. [PMID: 30261459 DOI: 10.1016/j.jhazmat.2018.07.068] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 07/04/2018] [Accepted: 07/17/2018] [Indexed: 06/08/2023]
Abstract
Highly concentrated arsenic generated from industrial operation processes has posted a great thrust to humans. In this study, yttrium-ferric binary composite prepared through a simple co-precipitation method and applied for removing highly concentrated arsenic from the simulated arsenic-containing water. An optimal molar ratio of Y/Fe was determined as 8:1, which had a point of zero charge of around 7.0. The yttrium-ferric binary composite was aggregated by the nano-sized particles. The chemical state of yttrium and iron in the adsorbent was + III. The maximum adsorption capacities of the adsorbent towards arsenate (As(V)) were 401.8 mg-As/g at pH 4 and 288.7 mg-As/g at pH 7, respectively. A contact time of 8 h was sufficient to achieve 80% of the ultimate removal, faster than many reported/commercial water treatment materials. The existence of fluoride and phosphate ions significantly retarded the uptake of arsenic, indicating that likely the adsorbent was capable of adsorbing both contaminants. The mechanism study with several tools such as X-ray photoelectron spectroscopy (XPS) indicated that such functional groups as hydroxyl and carbonate groups participated in the As(V) adsorption process via ligand exchange followed by the inner-sphere complexation.
Collapse
Affiliation(s)
- Ling Yu
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore; School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510006, China
| | - Yang Yu
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore; Guangdong Key Laboratory of Environmental Pollution and Health, and School of Environment, Jinan University, Guangzhou, 510632, China
| | - Jingyi Li
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore
| | - J Paul Chen
- Department of Civil and Environmental Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore.
| |
Collapse
|
50
|
Yu Y, Yu L, Wang C, Chen JP. An innovative yttrium nanoparticles/PVA modified PSF membrane aiming at decontamination of arsenate. J Colloid Interface Sci 2018; 530:658-666. [DOI: 10.1016/j.jcis.2018.06.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 05/27/2018] [Accepted: 06/03/2018] [Indexed: 11/15/2022]
|