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Wang Q, Peng Y, Chen M, Xu M, Ding J, Yao Q, Lu S. Synthesis of layered double hydroxides from municipal solid waste incineration fly ash for heavy metal adsorption. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169482. [PMID: 38135065 DOI: 10.1016/j.scitotenv.2023.169482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 12/09/2023] [Accepted: 12/16/2023] [Indexed: 12/24/2023]
Abstract
The process of urbanization has resulted in a continuous growth of the production of municipal solid waste, consequently leading to the increase of municipal solid waste incineration fly ash (MSWI FA) over time. This has prompted the need for effective disposal and value-added utilization strategies for MSWI FA. In this study, a hydrothermal method was employed to synthesize CaAl layered double hydroxides (LDHs) using MSWI FA as the raw material. The main objective was to investigate how different synthesis parameters affect the crystallinity of the layered bimetallic hydroxides. Subsequently, the synthesized LDHs were characterized using various techniques such as BET, SEM, XRD, FT-IR, and XPS. The results revealed the presence of calcium and aluminum cations in the interlayer region of the synthesized material, with chloride ions, sulfate ions, and acetate ions being the predominant anions. Moreover, the formation of LDHs presents an effective approach for the self-purification of leachates derived from MSWI FA. The LDHs exhibited excellent adsorption capacity for Cd2+ and Cu2+ in wastewater, with maximum values of 730 mg·g-1 and 446 mg·g-1, respectively. The adsorption mechanisms involved isomorphous substitution, complexation, as well as the precipitation of hydroxides or interlayer anions. This method presents a novel approach for effectively utilizing MSWI FA to produce environmentally friendly value-added adsorbents.
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Affiliation(s)
- Qionghao Wang
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yaqi Peng
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Min Chen
- Taizhou Institute of Zhejiang University, Zhejiang University, Taizhou 318000, China
| | - Mengxia Xu
- Department of Chemical and Environmental Engineering, and New Materials Institute, University of Nottingham Ningbo China, Ningbo 315100, China; Key Laboratory of Carbonaceous Waste Processing and Process Intensification of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, China
| | - Jiamin Ding
- Taizhou Institute of Zhejiang University, Zhejiang University, Taizhou 318000, China
| | - Qi Yao
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China
| | - Shengyong Lu
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China; Taizhou Institute of Zhejiang University, Zhejiang University, Taizhou 318000, China
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Ádám AA, Ziegenheim S, Janovák L, Szabados M, Bús C, Kukovecz Á, Kónya Z, Dékány I, Sipos P, Kutus B. Binding of Ca 2+ Ions to Alkylbenzene Sulfonates: Micelle Formation, Second Critical Concentration and Precipitation. MATERIALS 2023; 16:ma16020494. [PMID: 36676235 PMCID: PMC9864979 DOI: 10.3390/ma16020494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/20/2022] [Accepted: 12/30/2022] [Indexed: 01/06/2023]
Abstract
Anionic surfactants, such as sodium linear alkylbenzene sulfonates (NaLAS), are utilized in various fields, including industry, household, and agriculture. The efficiency of their use in aqueous environments is significantly affected by the presence of cations, Ca2+ and Mg2+ in particular, as they can decrease the concentration of the surfactant due to precipitation. To understand cation-sulfonate interactions better, we study both NaLAS colloidal solutions in the presence of CaCl2 and precipitates forming at higher salt concentrations. Upon addition of CaCl2, we find the surface tension and critical micelle concentration of NaLAS to decrease significantly, in line with earlier findings for alkylbenzylsulfonates in the presence of divalent cations. Strikingly, an increase in the surface tension is discernible above 0.6 g L-1 NaLAS, accompanied by the decrease of apparent micelle sizes, which in turn gives rise to transparent systems. Thus, there appears to be a second critical concentration indicating another micellar equilibrium. Furthermore, the maximum salt tolerance of the surfactant is 0.1 g L-1 Ca2+, above which rapid precipitation occurs yielding sparingly soluble CaLAS2∙2H2O.
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Affiliation(s)
- Adél Anna Ádám
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | | | - László Janovák
- Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Márton Szabados
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Csaba Bús
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Imre Dékány
- Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Pál Sipos
- Department of Inorganic and Analytical Chemistry, University of Szeged, H-6720 Szeged, Hungary
- Correspondence: (P.S.); (B.K.)
| | - Bence Kutus
- Department of Inorganic and Analytical Chemistry, University of Szeged, H-6720 Szeged, Hungary
- Correspondence: (P.S.); (B.K.)
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3
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Cheng P, Liu Y, Yang L, Wang X, Chi Y, Yuan H, Wang S, Ren YX. Adsorption and recovery of phosphate from aqueous solution by katoite: Performance and mechanism. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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4
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Zhang S, Li H, Zhang A, Sun Z, Zhang X, Yang C, Jin L, Song Z. Selective catalytic reduction of NO x by low-temperature NH 3 over Mn x Zr 1 mixed-oxide catalysts. RSC Adv 2022; 12:1341-1351. [PMID: 35425210 PMCID: PMC8978897 DOI: 10.1039/d1ra08800a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 12/21/2021] [Indexed: 11/21/2022] Open
Abstract
MnxZr1 series catalysts were prepared by a coprecipitation method. The effect of zirconium doping on the NH3-SCR performance of the MnOx catalyst was studied, and the influence of the calcination temperature on the catalyst activity was explored. The results showed that the Mn6Zr1 catalyst exhibited good NH3-SCR activity when calcined at 400 °C. When the reaction temperature was 125–250 °C, the NOx conversion rate of Mn6Zr1 catalyst reached more than 90%, and the optimal conversion efficiency reached 97%. In addition, the Mn6Zr1 catalyst showed excellent SO2 and H2O resistance at the optimum reaction temperature. Meanwhile, the catalysts were characterized. The results showed that the morphology of the MnOx catalyst was significantly changed, whereby as the proportion of Mn4+ and Oα species increased, the physical properties of the catalyst were improved. In addition, both Lewis acid sites and Brønsted acid sites existed in the Mn6Zr1 catalyst, which reduced the reduction temperature of the catalyst. In summary, zirconium doping successfully improved the NH3-SCR performance of MnOx. MnxZr1 series catalysts were prepared by a coprecipitation method.![]()
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Affiliation(s)
- Shuaibo Zhang
- School of Mechanical and Power Engineering, Henan Polytechnic University Jiaozuo 454000 China
| | - Haixia Li
- School of Mechanical and Power Engineering, Henan Polytechnic University Jiaozuo 454000 China
| | - Anchao Zhang
- School of Mechanical and Power Engineering, Henan Polytechnic University Jiaozuo 454000 China
| | - Zhijun Sun
- School of Mechanical and Power Engineering, Henan Polytechnic University Jiaozuo 454000 China
| | - Xinmin Zhang
- School of Mechanical and Power Engineering, Henan Polytechnic University Jiaozuo 454000 China
| | - Changze Yang
- School of Mechanical and Power Engineering, Henan Polytechnic University Jiaozuo 454000 China
| | - Leying Jin
- School of Mechanical and Power Engineering, Henan Polytechnic University Jiaozuo 454000 China
| | - Zhiheng Song
- School of Mechanical and Power Engineering, Henan Polytechnic University Jiaozuo 454000 China
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5
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Lopez NA, Luengo CV, Avena MJ. Ciprofloxacin in Layered Double Hydroxides: Looking for the Best Synthesis Method. J Pharm Sci 2021; 111:1429-1436. [PMID: 34678273 DOI: 10.1016/j.xphs.2021.10.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 10/12/2021] [Accepted: 10/12/2021] [Indexed: 11/26/2022]
Abstract
It is important to develop new methods of release to improve pharmacokinetic parameters of drugs, especially antibiotics, whose plasmatic concentration is determinant to ensure an effective treatment. Layered double hydroxides (LDH) are inorganic and biocompatible materials with high drug intercalation capacity and release properties that can be tuned by controlling the pH value. These materials can be an excellent choice to achieve a sustained release and an optimal drug concentration in plasm. In this work, LDH were synthesized with intercalated ciprofloxacin (CIP) by three different methods: coprecipitation, reconstruction and ion exchange. LDH-CIP complexes were characterized by XRD, TG-DSC, TEM, SEM, FTIR, electrophoretic mobilities, and drug release and dissolution kinetics in NaCl solutions and under physiological conditions. The coprecipitation and reconstruction methods lead to the formation of ill-defined products, whereas the ion exchange method rendered the best intercalation results. CIP release was controlled by dissolution at pH<3 and by desorption and ion exchange at intermediate and high pH. In comparison with a commercial formulation, the LDH-CIP complex prepared by ion exchange presented a slower release profile. The fast dissolution at gastric pH raises the need of developing some type of coating for protecting LDH materials.
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Affiliation(s)
- Nicolas A Lopez
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina.
| | - Carina V Luengo
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina
| | - Marcelo J Avena
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Bahía Blanca, Argentina
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Leão AD, da Silva LA, de Oliveira Silva Ribeiro F, da Silva DA, de França EJ, Aquino KADS, Soares-Sobrinho JL. Influence of Nonmodified Layered Double Hydroxide (LDH) Metal Constituents in PMMA/LDH Nanocomposites. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01742-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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7
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Abniki M, Moghimi A, Azizinejad F. Synthesis of
calcium‐layered
double hydroxide based nanohybrid for controlled release of an anti‐inflammatory drug. J CHIN CHEM SOC-TAIP 2020. [DOI: 10.1002/jccs.202000008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Milad Abniki
- Department of Chemistry, Varamin‐Pishva Branch Islamic Azad University Varamin Iran
| | - Ali Moghimi
- Department of Chemistry, Varamin‐Pishva Branch Islamic Azad University Varamin Iran
| | - Fariborz Azizinejad
- Department of Chemistry, Varamin‐Pishva Branch Islamic Azad University Varamin Iran
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8
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Zhu Z, Xiang M, Li P, Shan L, Zhang P. Surfactant-modified three-dimensional layered double hydroxide for the removal of methyl orange and rhodamine B: Extended investigations in binary dye systems. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121448] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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9
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Abdel-Aziz M, Zoromba MS, Bassyouni M, Zwawi M, Alshehri A, Al-Hossainy A. Synthesis and characterization of Co-Al mixed oxide nanoparticles via thermal decomposition route of layered double hydroxide. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.127679] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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10
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Synthesis of Er3+-doped hydrocalumite and its strong infrared emissions. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2020. [DOI: 10.1007/s13738-020-01898-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Wu X, Meng H, Du Y, Liu J, Hou B, Xie X. Fabrication of Highly Dispersed Cu-Based Oxides as Desirable NH 3-SCR Catalysts via Employing CNTs To Decorate the CuAl-Layered Double Hydroxides. ACS APPLIED MATERIALS & INTERFACES 2019; 11:32917-32927. [PMID: 31414788 DOI: 10.1021/acsami.9b08699] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this study, three kinds of CuAl-LDO/CNT (LDO, layered double oxide) catalysts were prepared by the assembly of CNTs and CuAl-LDH (LDH, layered double hydroxides) as well as subsequently structural topological transformation. The effects of the assembly method on the surface structure property and the DeNOx performance of the prepared samples were systematically investigated. It was found that three CuAl-LDO/CNT catalysts showed preferable NH3-SCR catalytic performance compared with CuAl-LDO where the catalyst CuAl-LDO/CNTs(I) exhibited optimum NOx conversion (>80%) and N2 selectivity (>90%) within 180-300 °C. Such fine catalytic performance can be attributed to the proper surface acidity and redox ability of the catalyst, which might be correlated with the high dispersion of Cu-based active centers caused by the induced nucleation and effective separation action of LDH by carbon nanotubes. In addition, the outstanding H2O and SO2 resistance of the CuAl-LDO/CNTs(I) catalyst was also obtained because of the synergistic effect between CuAl-LDO and CNTs, which could greatly promote the activation and decomposition of ammonium sulfate at lower temperatures.
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Affiliation(s)
- Xu Wu
- College of Chemistry and Chemical Engineering , Taiyuan University of Technology , Taiyuan 030024 , PR China
| | - Hao Meng
- College of Chemistry and Chemical Engineering , Taiyuan University of Technology , Taiyuan 030024 , PR China
| | - Yali Du
- College of Chemistry and Chemical Engineening , Jinzhong University , Jinzhong 030619 , PR China
| | - Jiangning Liu
- College of Chemistry and Chemical Engineering , Taiyuan University of Technology , Taiyuan 030024 , PR China
| | - Benhui Hou
- College of Chemistry and Chemical Engineering , Taiyuan University of Technology , Taiyuan 030024 , PR China
| | - Xianmei Xie
- College of Chemistry and Chemical Engineering , Taiyuan University of Technology , Taiyuan 030024 , PR China
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12
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Ramazani Afarani Z, Sarvi MN, Akbari Alavijeh M. Modification of montmorillonite nanolayers as a pH-responsive carrier of biomolecules: Delivery of vitamin B12. J Taiwan Inst Chem Eng 2018. [DOI: 10.1016/j.jtice.2018.01.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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Xu Y, Xia W, Hou H, Zhang J, Qian G. Remediation of chromium-contaminated soil by electrokinetics and electrokinetics coupled with CaAl-LDH permeable reaction barrier. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:20479-20486. [PMID: 28710730 DOI: 10.1007/s11356-017-9705-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 07/04/2017] [Indexed: 06/07/2023]
Abstract
The remediation of Cr(VI)-contaminated soil was investigated by electrokinetic (EK) and permeable-reactive-barrier assisted electrokinetic (EK-PRB). The medium of PRB was hydrocalumite (CaAl-LDH). The results showed that removal efficiency of hexavalent chromium (Cr(VI)) in EK-PRB and EK system was 96.49 and 85.50%, respectively. Simultaneously, the removal efficiency of total chromium (TCr) was 69.34 and 40.97% after 120-h treatment. The XRD, FTIR, and XPS analyses indicated that the reactive barrier media of CaAl-LDH successfully captured the chromium. Besides, the migration rate of chromium in EK-PRB was relatively faster than EK, since the media of PRB captured chromium in-time and reduced the influence of chromium accumulation on the migration of chromium. Moreover, the trivalent chromium (Cr(III)) was generated in EK/EK-PRB, and the chromium was stabilized in soil with the chemical speciations of oxidizable and residual fractions. Therefore, the treatment of EK-PRB and EK both increased the removal of chromium and decreased its environmental risks.
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Affiliation(s)
- Yunfeng Xu
- School of Environmental and Chemical Engineering, Shanghai University, No.99 Shangda Rd, Shanghai, 200444, People's Republic of China
| | - Wei Xia
- School of Environmental and Chemical Engineering, Shanghai University, No.99 Shangda Rd, Shanghai, 200444, People's Republic of China
| | - Hetian Hou
- School of Environmental and Chemical Engineering, Shanghai University, No.99 Shangda Rd, Shanghai, 200444, People's Republic of China
| | - Jia Zhang
- School of Environmental and Chemical Engineering, Shanghai University, No.99 Shangda Rd, Shanghai, 200444, People's Republic of China.
| | - Guangren Qian
- School of Environmental and Chemical Engineering, Shanghai University, No.99 Shangda Rd, Shanghai, 200444, People's Republic of China.
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14
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Chen Y, Wang X, Zhang K, Bao Y. Intercalation of cytosine into Eu3+-doped hydrocalumite and their fluorescent responses. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2017. [DOI: 10.1007/s13738-017-1176-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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Song J, Xie J, Li C, Lu JH, Meng QF, Yang Z, Lee RJ, Wang D, Teng LS. Near infrared spectroscopic (NIRS) analysis of drug-loading rate and particle size of risperidone microspheres by improved chemometric model. Int J Pharm 2014; 472:296-303. [PMID: 24954726 DOI: 10.1016/j.ijpharm.2014.06.033] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 05/19/2014] [Accepted: 06/10/2014] [Indexed: 11/18/2022]
Abstract
Microspheres have been developed as drug carriers in controlled drug delivery systems for years. In our present study, near infrared spectroscopy (NIRS) is applied to analyze the particle size and drug loading rate in risperidone poly(d,l-lactide-co-glycolide) (PLGA) microspheres. Various batches of risperidone PLGA microspheres were designed and prepared successfully. The particle size and drug-loading rate of all the samples were determined by a laser diffraction particle size analyzer and high performance liquid chromatography (HPLC) system. Monte Carlo algorithm combined with partial least squares (MCPLS) method was applied to identify the outliers and choose the numbers of calibration set. Furthermore, a series of preprocessing methods were performed to remove signal noise in NIR spectra. Moving window PLS and radical basis function neural network (RBFNN) methods were employed to establish calibration model. Our data demonstrated that PLS-developed model was only suitable for drug loading analysis in risperidone PLGA microspheres. Comparatively, RBFNN-based predictive models possess better fitting quality, predictive effect, and stability for both drug loading rate and particle size analysis. The correlation coefficients of calibration set (Rc(2)) were 0.935 and 0.880, respectively. The performance of optimum RBFNN models was confirmed by independent verification test with 15 samples. Collectively, our method is successfully performed to monitor drug-loading rate and particle size during risperidone PLGA microspheres preparation.
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Affiliation(s)
- Jia Song
- School of Life Sciences, Jilin University, No. 2699, Qianjin Avenue, Changchun, Jilin, China
| | - Jing Xie
- School of Life Sciences, Jilin University, No. 2699, Qianjin Avenue, Changchun, Jilin, China
| | - Chenliang Li
- School of Life Sciences, Jilin University, No. 2699, Qianjin Avenue, Changchun, Jilin, China
| | - Jia-Hui Lu
- School of Life Sciences, Jilin University, No. 2699, Qianjin Avenue, Changchun, Jilin, China
| | - Qing-Fan Meng
- School of Life Sciences, Jilin University, No. 2699, Qianjin Avenue, Changchun, Jilin, China
| | - Zhaogang Yang
- Division of Pharmaceutics, College of Pharmacy, The Ohio State University, Columbus, OH, USA
| | - Robert J Lee
- School of Life Sciences, Jilin University, No. 2699, Qianjin Avenue, Changchun, Jilin, China; Division of Pharmaceutics, College of Pharmacy, The Ohio State University, Columbus, OH, USA
| | - Di Wang
- School of Life Sciences, Jilin University, No. 2699, Qianjin Avenue, Changchun, Jilin, China.
| | - Le-Sheng Teng
- School of Life Sciences, Jilin University, No. 2699, Qianjin Avenue, Changchun, Jilin, China.
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16
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Zhang P, Wang T, Qian G, Frost RL. Organo-LDH synthesized via tricalcium aluminate hydration in the present of Na-dodecylbenzenesulfate aqueous solution and subsequent investigated by near-infrared and mid-infrared. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 125:195-200. [PMID: 24548813 DOI: 10.1016/j.saa.2014.01.062] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 12/24/2013] [Accepted: 01/08/2014] [Indexed: 06/03/2023]
Abstract
Na-dodecylbenzenesulfate (SDBS), a natural anionic surfactant, has been successfully intercalated into a Ca based LDH host structure during tricalcium aluminate hydration in the presence of SDBS aqueous solution (CaAl-SDBS-LDH). The resulting product was characterized by powder X-ray diffraction (XRD), mid-infrared (MIR) spectroscopy combined with near-infrared (NIR) spectroscopy technique, thermal analysis (TG-DTA) and scan electron microscopy (SEM). The XRD results revealed that the interlayer distance of resultant product was expanded to 30.46 Å. MIR combined with NIR spectra offered an effective method to illustrate this intercalation. The NIR spectra (6000-5500 cm(-1)) displayed prominent bands to expound SDBS intercalated into hydration product of C3A. And the bands around 8300 cm(-1) were assigned to the second overtone of the first fundamental of CH stretching vibrations of SDBS. In addition, thermal analysis showed that the dehydration and dehydroxylation took place at ca. 220 °C and 348 °C, respectively. The SEM results appeared approximately hexagonal platy crystallites morphology for CaAl-SDBS-LDH, with particle size smaller and thinner.
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Affiliation(s)
- Ping Zhang
- Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330047, China; School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072, China; Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, Queensland 4001, Australia
| | - Tianqi Wang
- Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330047, China
| | - Guangren Qian
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072, China.
| | - Ray L Frost
- Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, Queensland 4001, Australia.
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17
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Thermal Decomposition of Hydrocalumite over a Temperature Range of 400–1500°C and Its Structure Reconstruction in Water. J CHEM-NY 2014. [DOI: 10.1155/2014/454098] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The thermal decomposition process and structure memory effect of hydrocalumite were investigated systematically for the first time over a wide temperature range of 400–1500°C. The calcined hydrocalumite samples and their rehydrated products were characterized by XRD, FT-IR, and SEM-EDX. The results show that the calcination products at temperatures ranging from 500 to 900°C are basically mayenite and lime, while one of the final products obtained by calcination at and above 1000°C is probably tricalcium aluminate (Ca3Al2O6). For the hydrocalumite samples calcined at temperatures below 1000°C, their lamellar structure can be completely recovered in deionized water at room temperature. However, the further increase of calcination temperature could impair the regeneration ability of hydrocalumite via contact with water. Upon calcination of hydrocalumite at 1000–1500°C followed by reaction with water, a stable compound tricalcium aluminate hexahydrate (Ca3Al2O6·6H2O) was produced, which is the reason why less hydrocalumite could be regenerated.
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18
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Wongariyakawee A, Schäeffel F, Warner JH, O'Hare D. Surfactant directed synthesis of calcium aluminum layered double hydroxides nanoplatelets. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15994e] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Frost RL, Xi Y, Palmer SJ, Millar GJ, Tan K, Pogson RE. Vibrational spectroscopy of synthetic stercorite H(NH4)Na(PO4)·4H2O--a comparison with the natural cave mineral. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 84:269-274. [PMID: 21975047 DOI: 10.1016/j.saa.2011.09.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Revised: 08/31/2011] [Accepted: 09/14/2011] [Indexed: 05/31/2023]
Abstract
In order to mimic the chemical reactions in cave systems, the analogue of the mineral stercorite H(NH(4))Na(PO(4))·4H(2)O has been synthesised. X-ray diffraction of the stercorite analogue matches the stercorite reference pattern. A comparison is made with the vibrational spectra of synthetic stercorite analogue and the natural Cave mineral. The mineral in nature is formed by the reaction of bat guano chemicals on calcite substrates. A single Raman band at 920 cm(-1) (Cave) and 922 cm(-1) (synthesised) defines the presence of hydrogen phosphate in the mineral. In the synthetic stercorite analogue, additional bands are observed and are attributed to the dihydrogen and phosphate anions. The vibrational spectra of synthetic stercorite only partly match that of the natural stercorite. It is suggested that natural stercorite is more pure than that of synthesised stercorite. Antisymmetric stretching bands are observed in the infrared spectrum at 1052, 1097, 1135 and 1173 cm(-1). Raman spectroscopy shows the stercorite mineral is based upon the hydrogen phosphate anion and not the phosphate anion. Raman and infrared bands are found and assigned to PO(4)(3-), H(2)O, OH and NH stretching vibrations. Raman spectroscopy shows the synthetic analogue is similar to the natural mineral. A mechanism for the formation of stercorite is provided.
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Affiliation(s)
- Ray L Frost
- Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, Brisbane, Queensland, Australia.
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