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Truong HB, Doan TTL, Hoang NT, Van Tam N, Nguyen MK, Trung LG, Gwag JS, Tran NT. Tungsten-based nanocatalysts with different structures for visible light responsive photocatalytic degradation of bisphenol A. J Environ Sci (China) 2024; 139:569-588. [PMID: 38105077 DOI: 10.1016/j.jes.2023.09.028] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 09/18/2023] [Accepted: 09/20/2023] [Indexed: 12/19/2023]
Abstract
Environmental pollution, such as water contamination, is a critical issue that must be absolutely addressed. Here, three different morphologies of tungsten-based photocatalysts (WO3 nanorods, WO3/WS2 nanobricks, WO3/WS2 nanorods) are made using a simple hydrothermal method by changing the solvents (H2O, DMF, aqueous HCl solution). The as-prepared nanocatalysts have excellent thermal stability, large porosity, and high hydrophilicity. The results show all materials have good photocatalytic activity in aqueous media, with WO3/WS2 nanorods (NRs) having the best activity in the photodegradation of bisphenol A (BPA) under visible-light irradiation. This may originate from increased migration of charge carriers and effective prevention of electron‒hole recombination in WO3/WS2 NRs, whereby this photocatalyst is able to generate more reactive •OH and •O2- species, leading to greater photocatalytic activity. About 99.6% of BPA is photodegraded within 60 min when using 1.5 g/L WO3/WS2 NRs and 5.0 mg/L BPA at pH 7.0. Additionally, the optimal conditions (pH, catalyst dosage, initial BPA concentration) for WO3/WS2 NRs are also elaborately investigated. These rod-like heterostructures are expressed as potential catalysts with excellent photostability, efficient reusability, and highly active effectivity in different types of water. In particular, the removal efficiency of BPA by WO3/WS2 NRs reduces by only 1.5% after five recycling runs and even reaches 89.1% in contaminated lake water. This study provides promising insights for the nearly complete removal of BPA from wastewater or different water resources, which is advantageous to various applications in environmental remediation.
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Affiliation(s)
- Hai Bang Truong
- Optical Materials Research Group, Science and Technology Advanced Institute, Van Lang University, Ho Chi Minh City, Viet Nam, E-mail: (Hai Bang Truong); Faculty of Applied Technology, School of Technology, Van Lang University, Ho Chi Minh City, Viet Nam
| | - Thi Thu Loan Doan
- The University of Da Nang, University of Science and Technology, 54 Nguyen Luong Bang, Da Nang, Viet Nam
| | - Nguyen Tien Hoang
- The University of Da Nang, University of Science and Education, 459 Ton Duc Thang St., Lien Chieu, Da Nang 550000, Viet Nam
| | - Nguyen Van Tam
- Institute of Veterinary Science and Technology, 31ha zone, Trau Quy, Gia Lam, Ha Noi 12400, Viet Nam
| | - Minh Kim Nguyen
- Institute of Veterinary Science and Technology, 31ha zone, Trau Quy, Gia Lam, Ha Noi 12400, Viet Nam.
| | - Le Gia Trung
- Department of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
| | - Jin Seog Gwag
- Department of Physics, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
| | - Nguyen Tien Tran
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang 550000, Viet Nam; Faculty of Natural Sciences, Duy Tan University, 03 Quang Trung, Da Nang 550000, Viet Nam.
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Trung LG, Nguyen MK, Hang Nguyen TD, Tran VA, Gwag JS, Tran NT. Highly efficient degradation of reactive black KN-B dye by ultraviolet light responsive ZIF-8 photocatalysts with different morphologies. RSC Adv 2023; 13:5908-5924. [PMID: 36816065 PMCID: PMC9936357 DOI: 10.1039/d2ra08312d] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Accepted: 02/10/2023] [Indexed: 02/19/2023] Open
Abstract
Zeolitic imidazolate framework ZIF-8, a type of metal-organic framework, has diverse applications in multiple catalytic fields due to its outstanding properties. Herein, ZIF-8 photocatalysts with three different morphologies (dodecahedral, pitaya-like, and leaf-like) are successfully synthesized under ambient conditions from zinc salts by altering the volume ratio of methanol and water used as a solvent. The as-synthesized ZIFs have high crystallinity with distinct BET surface areas. The experiments indicate that the ZIFs have high photocatalytic efficiency, in which the leaf-like structure (ZIF-8-F3) is the most efficient in the degradation of reactive black KN-B dye (RB5) under 365 nm UV irradiation. This is due to the efficient inhibition of electron-hole recombination or the higher migration of charge carriers in ZIF-8-F3, thus producing more reactive oxygen species, resulting in greater photocatalytic efficiency. At pH = 11, more than 95% of RB5 is degraded within 2 hours when using 1.0 g L-1 of ZIF-8-F3. Besides, the photocatalytic and kinetic performances of ZIF-8-F3 are also investigated by optimizing the pH, initial RB5 concentration, and dosage of the used catalyst. These ZIF-8-F3 plates have been shown to be a promising material with high photostability and effective reusability, beneficial to various potential applications in environmental remediation issues.
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Affiliation(s)
- Le Gia Trung
- Department of Physics, Yeungnam University Gyeongsan Gyeongbuk 38541 Republic of Korea
| | - Minh Kim Nguyen
- College of Pharmacy, Chungnam National UniversityYuseongDaejeon 34134Republic of Korea
| | - Thi Dieu Hang Nguyen
- The University of Da Nang, University of Science and Technology (DUT)54 Nguyen Luong BangDa Nang550000Vietnam
| | - Vy Anh Tran
- Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh UniversityHo Chi Minh City 700000Vietnam,Faculty of Environmental and Food Engineering, Nguyen Tat Thanh UniversityHo Chi Minh City 700000Vietnam
| | - Jin Seog Gwag
- Department of Physics, Yeungnam University Gyeongsan Gyeongbuk 38541 Republic of Korea
| | - Nguyen Tien Tran
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University 03 Quang Trung Da Nang 550000 Vietnam .,Faculty of Natural Sciences, Duy Tan University 03 Quang Trung Da Nang 550000 Vietnam
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Trung LG, Nguyen MK, Hang Nguyen TD, Tran VA, Gwag JS, Tran NT. Correction: Highly efficient degradation of reactive black KN-B dye by ultraviolet light responsive ZIF-8 photocatalysts with different morphologies. RSC Adv 2023; 13:9501. [PMCID: PMC10034918 DOI: 10.1039/d3ra90020g] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 03/13/2023] [Indexed: 03/25/2023] Open
Abstract
Correction for ‘Highly efficient degradation of reactive black KN-B dye by ultraviolet light responsive ZIF-8 photocatalysts with different morphologies’ by Le Gia Trung et al., RSC Adv., 2023, 13, 5908–5924, http://dx.doi.org/10.1039/d2ra08312d.
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Affiliation(s)
- Le Gia Trung
- Department of Physics, Yeungnam UniversityGyeongsanGyeongbuk 38541Republic of Korea
| | - Minh Kim Nguyen
- The University of Da Nang, University of Technology and Education48 Cao Thang St., Hai Chau Dist.Da Nang City 550000Vietnam
| | - Thi Dieu Hang Nguyen
- The University of Da Nang, University of Science and Technology (DUT)54 Nguyen Luong BangDa Nang550000Vietnam
| | - Vy Anh Tran
- Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh UniversityHo Chi Minh City 700000Vietnam
- Faculty of Environmental and Food Engineering, Nguyen Tat Thanh UniversityHo Chi Minh City 700000Vietnam
| | - Jin Seog Gwag
- Department of Physics, Yeungnam UniversityGyeongsanGyeongbuk 38541Republic of Korea
| | - Nguyen Tien Tran
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University03 Quang TrungDa Nang550000Vietnam
- Faculty of Natural Sciences, Duy Tan University03 Quang TrungDa Nang550000Vietnam
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Nguyen TT, Dung Nguyen TT, Vo TK, Tran NMA, Nguyen MK, Van Vo T, Van Vo G. Nanotechnology-based drug delivery for central nervous system disorders. Biomed Pharmacother 2021; 143:112117. [PMID: 34479020 DOI: 10.1016/j.biopha.2021.112117] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [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: 07/02/2021] [Revised: 08/12/2021] [Accepted: 08/24/2021] [Indexed: 02/06/2023] Open
Abstract
Drug delivery to central nervous system (CNS) diseases is very challenging since the presence of the innate blood-brain barrier (BBB) and the blood-cerebrospinal fluid barrier that impede drug delivery. Among new strategies to overcome these limitations and successfully deliver drugs to the CNS, nanotechnology-based drug delivery platform, offers potential therapeutic approach for the treatment of some common neurological disorders like Alzheimer's disease, frontotemporal dementia, amyotrophic lateral sclerosis, Parkinson's disease, Huntington's disease. This review aimed to highlight advances in research on the development of nano-based therapeutics for their implications in therapy of CNS disorders. The challenges during clinical translation of nanomedicine from bench to bed side is also discussed.
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Affiliation(s)
- Thuy Trang Nguyen
- Faculty of Pharmacy, Ho Chi Minh City University of Technology (HUTECH), Ho Chi Minh City 700000, Viet Nam
| | - Thi Thuy Dung Nguyen
- Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University, Ho Chi Minh City 700000, Viet Nam
| | - Tuong Kha Vo
- Viet Nam Sports Hospital, Ministry of Culture, Sports and Tourism, Hanoi 100000, Viet Nam
| | - Nguyen-Minh-An Tran
- Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh City 71420, Viet Nam
| | - Minh Kim Nguyen
- Department of Chemical Engineering-Environment, The University of Danang, University of Technology and Education, 48 Cao Thang St., Hai Chau Dist., Danang City 550000, Viet Nam
| | - Toi Van Vo
- School of Biomedical Engineering, International University, Vietnam National University - Ho Chi Minh City (VNU-HCM), Ho Chi Minh City 700000, Viet Nam; Vietnam National University - Ho Chi Minh City (VNU-HCM), Ho Chi Minh City 700000, Viet Nam.
| | - Giau Van Vo
- Department of Biomedical Engineering, School of Medicine, Vietnam National University -Ho Chi Minh City (VNU-HCM), Ho Chi Minh City 700000, Viet Nam; Research Center for Genetics and Reproductive Health, School of Medicine, Vietnam National University - Ho Chi Minh City (VNU-HCM), Ho Chi Minh City 700000, Viet Nam; Vietnam National University - Ho Chi Minh City (VNU-HCM), Ho Chi Minh City 700000, Viet Nam.
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Tran NT, Trung LG, Nguyen MK. The degradation of organic dye contaminants in wastewater and solution from highly visible light responsive ZIF-67 monodisperse photocatalyst. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122287] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Nguyen MK, Trung LG, Nguyen HH, Tran NT. Preparation of Al(OH)3-based layered structural material by shear alignment from aqueous dispersion of colloidal gibbsite platelets. J Taiwan Inst Chem Eng 2021. [DOI: 10.1016/j.jtice.2021.06.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Nguyen MK, Park D, Lee YC. Influence of Chitosan-Based Carbon Dots on Astaxanthin Production of Green Alga Tetraselmis sp. J Nanosci Nanotechnol 2021; 21:3689-3696. [PMID: 33715675 DOI: 10.1166/jnn.2021.19178] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
CDs are carbon fluorescent nanomaterials that have gained significant attention in recent years owing to their unique properties. In this work, we utilized a simple solution to produce CDs with func-tionalized amino groups via a one-step carbonization from a chitosan precursor. This simultaneous approach does not use special reagent for either the formation step or the amino-functionalization step of CDs. The as-prepared amino-functionalized CDs that possesses expected characteristics, such as nano-size distribution, monodispersible, high blue light emission, high absolute quantum yield of 5.52%, and functionalized amino groups on the surface. Furthermore, this work demonstrated the low cytotoxicity and high biocompatibility of the CDs, through the improvements in the astaxanthin production of alga Tetraselmis sp. (more than doubled (up to 0.044 mg/L), relative to the control). Thus, as-prepared CDs have promising properties not only for applications in bioimaging, drug delivery or sensors, but also as promoter in algal biorefinery.
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Affiliation(s)
- Minh Kim Nguyen
- Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si 13120, Gyeonggi-do, Republic of Korea
| | - Duckshin Park
- Transportation Environmental Research Team, Korea Railroad Research Institute (KRRI), #176 Cheoldo bangmulgwan-ro, Uiwang-si 16105, Gyeonggi-do, Republic of Korea
| | - Young-Chul Lee
- Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si 13120, Gyeonggi-do, Republic of Korea
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Lee JY, Kim YK, Nguyen MK, Bui VKH, Lee YC. Magnesium Aminoclay (MgAC) as an Additive in Anti-Icing Mixture of Propylene Glycol Applied to Railway Electrical Wires: A Preliminary Study. J Nanosci Nanotechnol 2021; 21:1955-1960. [PMID: 33404475 DOI: 10.1166/jnn.2021.18896] [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] [Indexed: 06/12/2023]
Abstract
Ice accumulation on the surface of railway electrical wires can cause significant problems in the winter season. Different anti-icing liquids have been used to prevent the formation of ice on different surface substrates. The most common anti-icing liquids are ethylene glycol mixtures. Recently, propylene glycol, due to its lesser toxicity, has been considered as an alternative anti-icing agent. However, propylene glycol mixtures have some limitations, in that their degradation can lead to corrosion of the metal substrate. As detailed in the literature, (3-aminopropyl)-triethoxysilane (APTES), the precursor of magnesium aminoclay (MgAC), has been used to protect metal substrates from corrosion. In the present study we examined the potential of MgAC as an APTES-alternative additive in propylene glycol mixtures. The results showed that the anti-icing properties of the propylene glycol mixtures were maintained in the presence of MgAC (at 0.1, 0.5, and 1.0 wt.% concentrations). Furthermore, MgAC's potential as a thickening agent was shown in the increased viscosity of the propylene glycol/MgAC mixtures relative to the propylene glycol mixtures. The addition of MgAC also rendered the propylene glycol mixtures more hydrophilic. However, MgAC addition also led to corrosion due to the excess amounts of amine groups in the anti-icing solution. In this paper, the corrosion mechanism of MgAC is explained in the paper. In the future, the anti-icing and anticorrosion properties of propylene glycol/MgAC mixtures at low concentrations (<0.1 wt.%) should be more fully investigated.
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Affiliation(s)
- Jae-Young Lee
- Transportation Environmental Research Team, Korea Railroad Research Institute (KRRI), #176 Cheoldo Bangmulgwan-ro, Uiwang-si, Gyeonggi-do 16105, Republic of Korea
| | - Yong-Ki Kim
- Transportation Environmental Research Team, Korea Railroad Research Institute (KRRI), #176 Cheoldo Bangmulgwan-ro, Uiwang-si, Gyeonggi-do 16105, Republic of Korea
| | - Minh Kim Nguyen
- Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Republic of Korea
| | - Vu Khac Hoang Bui
- Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Republic of Korea
| | - Young-Chul Lee
- Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do 13120, Republic of Korea
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Nguyen TAH, Ngo HH, Guo WS, Nguyen TT, Vu ND, Soda S, Nguyen THH, Nguyen MK, Tran TVH, Dang TT, Nguyen VH, Cao TH. White hard clam (Meretrix lyrata) shells as novel filter media to augment the phosphorus removal from wastewater. Sci Total Environ 2020; 741:140483. [PMID: 32615439 DOI: 10.1016/j.scitotenv.2020.140483] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 05/13/2020] [Revised: 06/20/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
It is well recognized that filter media play a crucial role in constructed wetlands (CWs) for decontamination of phosphorus (P)-rich wastewater. This study investigates the suitability of raw white hard clam shells (WHC) and white hard clam shells thermally modified at 800 °C (WHC-M800) as potential media to enhance P treatment performance in CWs. The results indicated that both WHC and WHC-M800 displayed appropriate physicochemical properties, such as high porosity, excellent hydraulic conductivity, and rich Ca content. WHC-M800 exhibited a superior P adsorption capacity (38.7 mg/g) to WHC (12.8 mg/g). However, the practical utilization of WHC-M800 as filter media in CWs may be compromised, due to certain limitations, for example: extremely high pH values in the post-adsorption solutions; high weight losses during calcination and adsorption processes; low mechanical strength; and intensive energy consumption. In contrast, the WHC demonstrated significant advantages of reasonably high P adsorption capacity, locally abundant availability, low cost, and marginal side effects. The fractionation of inorganic P of WHC and WHC-M800 revealed that Ca-bounded P was the most dominant binding form, followed by loosely bound P, Fe-P, occluded P, and Al-P. The present study demonstrates that recycling of WHC shells as a potential substrate in CWs provides a feasible method for upgrading P removal in CWs. Additionally, it helps to reduce waste WHC shells in a simple, cheap, and eco-friendly way, thus can double environmental benefits.
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Affiliation(s)
- T A H Nguyen
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - H H Ngo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney, Broadway NSW 2007, Australia.
| | - W S Guo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney, Broadway NSW 2007, Australia
| | - T T Nguyen
- Graduate School of Science and Engineering, Ritsumeikan University (RITs), Biwako-Kusatsu Campus, Shiga 525-8577, Japan
| | - N D Vu
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam; Center for Environmental Technology and Sustainable Development, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - S Soda
- Graduate School of Science and Engineering, Ritsumeikan University (RITs), Biwako-Kusatsu Campus, Shiga 525-8577, Japan
| | - T H H Nguyen
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - M K Nguyen
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - T V H Tran
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - T T Dang
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - V H Nguyen
- Research Center for Environmental Monitoring and Modeling, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - T H Cao
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam; Center for Environmental Technology and Sustainable Development, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
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Nguyen MK, Moon JY, Lee YC. Microalgal ecotoxicity of nanoparticles: An updated review. Ecotoxicol Environ Saf 2020; 201:110781. [PMID: 32497816 DOI: 10.1016/j.ecoenv.2020.110781] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [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: 01/16/2020] [Revised: 05/05/2020] [Accepted: 05/18/2020] [Indexed: 06/11/2023]
Abstract
Nowadays, nanotechnology and its related industries are becoming a rapidly explosive industry that offers many benefits to human life. However, along with the increased production and use of nanoparticles (NPs), their presence in the environment creates a high risk of increasing toxic effects on aquatic organisms. Therefore, a large number of studies focusing on the toxicity of these NPs to the aquatic organisms are carried out which used algal species as a common biological model. In this review, the influences of the physio-chemical properties of NPs and the response mechanisms of the algae on the toxicity of the NPs were discussed focusing on the "assay" studies. Besides, the specific algal toxicities of each type of NPs along with the NP-induced changes in algal cells of these NPs are also assessed. Almost all commonly-used NPs exhibit algal toxicity. Although the algae have similarities in the symptoms under NP exposure, the sensitivity and variability of each algae species to the inherent properties of each NPs are quite different. They depend strongly on the concentration, size, characteristics of NPs, and biochemical nature of algae. Through the assessment, the review identifies several gaps that need to be further studied to make an explicit understanding. The findings in the majority of studies are mostly in laboratory conditions and there are still uncertainties and contradictory/inconsistent results about the behavioral effects of NPs under field conditions. Besides, there remains unsureness about NP-uptake pathways of microalgae. Finally, the toxicity mechanisms of NPs need to be thoughtfully understood which is essential in risk assessment.
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Affiliation(s)
- Minh Kim Nguyen
- Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 13120, Republic of Korea.
| | - Ju-Young Moon
- Department of Beauty Design Management, Hansung University, 116 Samseongyoro-16 gil, Seoul, 02876, Republic of Korea.
| | - Young-Chul Lee
- Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 13120, Republic of Korea.
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Anger F, Legré R, Nguyen MK. Results of wrist hemiarthroplasty for comminuted distal radius fractures in independent elderly people: A retrospective study on eleven patients. Hand Surg Rehabil 2019; 38:150-156. [PMID: 30711539 DOI: 10.1016/j.hansur.2018.11.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 09/29/2018] [Accepted: 11/30/2018] [Indexed: 11/29/2022]
Abstract
The comminuted distal radius fractures among elderly people are usually linked to osteoporosis, and repairing them in this context is a therapeutical challenge. Several teams have reported good results of radius resurfacing. The goal of our study was to evaluate the usability of the wrist in a new series of patients after surgery. We performed a monocentric retrospective study on the data of the medical files. All the included patients were older than 65 years and received a wrist hemiarthroplasty according to the criteria that have been established by the in charge medical team. Eleven patients have been included, their average age was 80.4 years old, and the average follow-up was 18.3 months. The average QuickDASH Score was 59 (27-95). The Visual Analogue Scale for pain was in average 3.8/10 and the average mobility was: flexion 36° (12-50), extension 27° (12-50), radial deviation 15° (12-15), ulnar deviation 26° (12-40), pronation-supination range of motion 164° (150-170). The average measured strength was 44% (16-72%) of the strength of the unaffected hand. Our results are rather modest, probably because of insufficient follow-up and very severe fractures. Furthermore, the implant that has been used does not take into account the distal radioulnar joint. Another bound of this treatment is the complexity of surgical revision in case of bad result. So far, hemiarthroplasty cannot be considered as the standard treatment for complex fractures of the distal radius.
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Affiliation(s)
- F Anger
- Hôpital d'Instruction des armées Sainte-Anne, service de chirurgie orthopédique et traumatologie, 2, boulevard Sainte-Anne, 83200 Toulon, France.
| | - R Legré
- AP-HM, hôpital de la Timone, service de chirurgie de la main, 264, rue Saint-Pierre, 13385 Marseille cedex 5, France
| | - M K Nguyen
- Hôpital d'Instruction des armées Sainte-Anne, service de chirurgie orthopédique et traumatologie, 2, boulevard Sainte-Anne, 83200 Toulon, France
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Nguyen MK, Regniery R, Truong TT, Zaidi H. Compton scattered imaging based on the V-line radon transform and its medical imaging applications. Annu Int Conf IEEE Eng Med Biol Soc 2010; 2010:4300-3. [PMID: 21095755 DOI: 10.1109/iembs.2010.5626139] [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] [Indexed: 11/08/2022]
Abstract
The Radon transform (RT) on straight lines deals as mathematical foundation for many tomographic modalities (e.g. Xray scanner, Positron Emission Tomography), using only primary radiation. In this paper, we consider a new RT defined on a pair of half-lines forming a letter V, arising from the modeling a two-dimensional emission imaging process by Compton scattered gamma rays. We establish its analytic inverse, which is shown to support the feasibility of the reconstruction of a two-dimensional image from scattered radiation collected on a one-dimensional collimated camera. Moreover, a filtered back-projection inversion method is also constructed. Its main advantages are algorithmic efficiency and computational rapidity. We present numerical simulations to illustrate the working. To sum up, the V-line RT leads not only to a new imaging principle, but also to a new concept of detector with high energetic resolution capable to collect the scattered radiation.
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Affiliation(s)
- M K Nguyen
- Equipes Traitement de l'Information et Systèmes, CNRS 8051/ ENSEA / Université de Cergy-Pontoise, F-95302 Cergy-Pontoise Cedex, France
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Abstract
Transmission scanning-based estimation of the attenuation map plays a crucial role in quantitative radionuclide imaging. X-ray computed tomography (CT) reconstructs directly the attenuation coefficients map from data transmitted through the object. This paper proposes an alternative route for reconstructing the object attenuation map by exploiting Compton scatter of transmitted radiation from an externally placed radionuclide source. In contrast to conventional procedures, data acquisition is realized as a series of images parameterized by the Compton scattering angle and registered on a stationary gamma camera operating without spatial displacement. Numerical simulation results using realistic voxel-based phantoms are presented to illustrate the efficiency of this new transmission scanning approach for attenuation map reconstruction. The encouraging results presented in this paper may suggest the possibility of proposing a new concept for emission/transmission imaging using scattered radiation, which has many advantages compared to conventional technologies.
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Affiliation(s)
- M K Nguyen
- Laboratoire Equipes de Traitement des Images et du Signal (CNRS UMR 8051/ENSEA/Université de Cergy-Pontoise), 6, avenue du Ponceau, 95014 Cergy-Pontoise, France.
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Monchal T, Levadoux M, Pellet N, Nguyen MK, Ottomani S, Gaillard C, Hornez E, Michaut C. [White tumor of the wrist: a rare site of tuberculosis involvement]. Med Trop (Mars) 2007; 67:134. [PMID: 17691430] [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: 05/16/2023]
Affiliation(s)
- T Monchal
- Service de Chirurgie Orthopédique et Traumatologique, HIA Sainte Anne, Toulon Armées, France.
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Nguyen MK, Mohammad-Djafari A. Bayesian approach with the maximum entropy principle in image reconstruction from microwave scattered field data. IEEE Trans Med Imaging 1994; 13:254-262. [PMID: 18218502 DOI: 10.1109/42.293918] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Microwave imaging is of great interest in medical applications owing to its high sensitivity with respect to dielectric properties. It allows detection of very small inhomogeneities. The image reconstruction employing the microwave inverse scattering consists of reconstructing the image of an object from the scattered field measured behind the object. This reconstruction runs up against the nonuniqueness of the solution of the inverse scattering problem. The authors propose to solve the ill-posed inverse problem by a statistical regularization method based on the Bayesian maximum a posteriori estimation where the principle of maximum entropy is used for assigning the a priori laws. The results obtained demonstrate the power and potential of this method in image reconstruction.
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