SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Geting Xu,Binghui Wang,Jingwen Xu,Edison Huixiang Ang,Junbin Liao,Jiangnan Shen
This study involves the development of a series of primary and secondary crosslinked anion exchange membranes (AEMs) within PVDF semi-interpenetrating networks, establishing a stable ion exchange structure. The optimal AEM, identified as DAEM-3, exhibits an ion exchange capacity (IEC) of 0.92 mmol·g −1 , a solute diffusion rate of 0.0076 mmol/(cm 2 ·h·mol/L). Remarkably, the desalination rate could reach 95.66 % within 180 min at a current density of 15 mA·cm −2 , with the current efficiency of 81.12 %, surpassing the performance of the commercial membrane (AMX). Furthermore, the concentration rate reaches 17.00 % during a 390-minute process at a current density of 50 mA·cm −2 , highlighting the ability of secondary cross-linking to simultaneously regulate IEC and the degree of cross-linking for improved densification and ion exchange performance. Moreover, the relatively tight cross-linked structure could be found to reduce water permeability and slow down the rate of spontaneous solute diffusion, making it a promising advancement in ED desalination and concentration technologies applied in zero liquid discharge.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 22
·50519
·
IF 3.125
Wei Wang,Peng Zhang,Yaping Shi,Zhichao Zhang,Xin Xu,Ping Ding
The composite membrane with the advantages of high separation efficiency and wide application, has been widely concerned in the field of water purification and molecular separation. However, the common composite membrane cannot achieve continuity, or the grafting process is complex, which significantly hinders its further development. In this work, the in-situ polymerization of UiO-66/PVDF supramolecular flat membranes as the continuous and high-performance composite membrane can be easily synthesized using the supramolecular force, (such as, hydrogen bond, etc.). These supramolecular membranes exhibit good hydrophilic (61°) and anti-fouling performance for bovine serum albumin (BSA) solution with rejection rate 97.79% than the original membrane. Moreover, this membrane can achieve more MOF doping based on maintaining the membrane performance, which undoubtedly greatly improves its hydrophilicity and mechanical properties. In addition, we also characterized the porous microstructure of the UiO-66/PVDF supramolecular membrane to analyze the influence of different doping amounts on the membrane structure. This supramolecular membrane has the advantages of simple synthesis, good hydrophilicity and water separation performance, which provides a more convenient and effective way for the preparation of MOFs/polymer flat membrane, and also provides a new method and new idea for expanding the application of MOFs/polymer ultrafiltration membrane in water treatment.
研究领域:
材料科学
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环境工程
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分离技术
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DOI
高影响因子
Nano Energy
·
2022
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IF 19.069
Yanhua Cui,Zengkai Wang,Binrong Li,Yan Yan,Ruibo Xu,Minjia Meng,Yongsheng Yan
Piezoelectric materials have been widely used in photocatalytic systems as it forms a built-in electric field to facilitate the migration of photo-induced charge-carriers. Herein, we report a three-dimensional (3D) porous g-C 3 N 4 /LiNbO 3 /PVDF membrane with an enhanced fluid-induced piezoelectric field for photocatalytic hydrogen evolution reaction (HER). The freezing phase inversion strategy is critical to the formation of piezoelectric sensitive β phase PVDF. The unique 3D porous membrane structure and the fluid-induced piezoelectric potential synergistically contribute to the HER efficiency under white light illumination. The as-prepared g-C 3 N 4 /LiNbO 3 /PVDF piezoelectric photocatalytic membrane (19.6875 cm 2 in size) exhibited HER rate of 136.02 µmol h −1 , which was even higher than that of the g-C 3 N 4 /LiNbO 3 powder sample (111.8 µmol h −1 ) with the identical mass of catalyst particles . In-situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) demonstrates a better water affinity of the porous g-C 3 N 4 /LiNbO 3 /PVDF piezoelectric membrane prepared by the freezing phase inversion than other PVDF membranes prepared by traditional phase inversion and vacuum drying methods. Piezoelectric force microscopy (PFM), in-situ piezoelectric and piezoelectric current measurements further visualized the fluid-induced piezoelectric field on 3D g-C 3 N 4 /LiNbO 3 /PVDF membrane, by which boosting the HER efficiency.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Shusu Shen,Honglin Li,Yang Shen,Renbi Bai,Ganwei Zhang
Metal organic frameworks (MOFs) possess excellent post-modification characteristics, high specific surface area, diversity of skeleton composition and pore tunability, have been increasingly applied in membrane modifications. In this work, NH 2 -MIL-88B(Fe) (NM88B) was first fixed onto polyvinylidene fluoride (PVDF) membrane by polyethyleneimine (PEI) through a vacuum-assisted self-assembly process, and the deposited NM88B was subsequently grafted with perfluoroalkyl polyethoxyacetic acid (FPEOAA) via a condensation reaction to realize the surface modifications. The modified membranes (named as N1F x ) showed improved hydrophilicity and underwater-oleophobicity. In addition, very high pure water flux (up to 9403 L‧m −2 ‧h −1 ) was obtained for the N1F x membranes due to the high porosity of introduced NM88B. In the dead-end filtration experiments of n -hexadecane-water emulsion, the optimum membrane N1F20 showed a good oil rejection rate (98.3%) and high permeation flux (667 L‧m −2 ‧h −1 ) which is approximately seven times of the pure PVDF membrane, indicating that the surface-modified membranes had excellent permeability and good separation performance. Even after four filtration cycles of oil-water emulsion, the rejection rate maintained higher than 97%, showing good reusability. Furthermore, the study found that N1F20 had certain acid and alkaline resistance and great potential for engineering applications.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
Results in Engineering
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2024
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IF 6
Thi Thi Mar,Yunlong Xue,Yu Chang,Zijian Yu,Zhongxiao Du,Bing Cao,Rui Zhang
Pervaporation emerges as a promising technique for brine treatment. In this investigation, we employed a PVDF substrate layer and applied various coating solutions using a simple spray technique to produce a composite pervaporation membrane. The composite membrane's chemical structure, morphology, hydrophilicity, swelling property, surface roughness, and crosslinking conditions were thoroughly investigated. Notably, the PVDF/PEI/P(SS-MA) composite membrane exhibited outstanding desalination performance, demonstrating high salt rejection and flux of 308.7 ± 13.8 kg m −2 h −1 when subjected to a 3.5 wt% sodium chloride solution. Even at an elevated brine concentration of 20 wt%, the membrane maintained a commendable flux of 88.76 ± 5.4 kg m −2 h −1 at 72 °C. These findings underscore the efficacy of the developed composite membrane for brine desalination applications.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2021
·Vol. 36
·期 3
·303-310
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IF 0.957
Dai Jinhang,Meng Shunliang,Yang Chuntian,Lü Wenzhong,Chen Xizi,Yin Yuhao,Liang Fei
To get a dielectric material with a high dielectric permittivity and suppressed dielectric loss, nano-Ag with a particle size of 20 nm and Ag@TiO 2 core-shell particles with diameters of approximately 70–120 nm were embedded in polyvinylidene fluoride (PVDF) to fabricate nano-Ag/Ag@TiO 2 /PVDF composites. After being modified by nano-Ag with 3 vol% optimal amount, the relative permittivity ( ε r ) at 100 Hz of 50 vol% Ag@TiO 2 /PVDF composites was 61, and the dielectric loss can be suppressed to 0.04, almost 96.4% lower than that of unmodified composites, and a higher frequency stability of both ε r and loss has also been found. The underlying mechanism of the reduced loss was attributed to Maxwell-Wagner polarization and the Coulomb blockade effect caused by the introduction of a small amount of nano-Ag, which will block the movement of electrons between metal nanoparticles and composites. The space charge polarization and conductance loss are weakened at lower and higher Ag@TiO 2 filling ratios, respectively, thus leading to a very low loss of the composites.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 30
·期 2
·351-359
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IF 2.137
Jinying Du,Yu Tian,Ning Li,Jun Zhang,Wei Zuo
In order to improve the antifouling performance of PVDF membrane, a novel zinc sulfide/graphene oxide/polyvinylidene fluoride (ZnS/GO/PVDF) composite membrane was prepared by immersed phase inversion method. The surface morphology, crystal structure, photocatalytic activity, and antifouling property of the as-prepared membranes were systematically studied. Results showed that the ZnS/GO/PVDF hybrid membranes were successfully fabricated with uniform surface. The hybrid membrane surface possessed higher hydrophilicity with water contact angle decreasing from 77.1° to 62.2°. The permeability of the hybrid membrane was therefore enhanced from 222.9 to 326.1 L/(m 2 hour). Moreover, bovine serum albumin (BSA) retention experiment showed that the hybrid membrane separation was also promoted by 7.2%. The blending of ZnS and GO enhanced the hydrophilic and photocatalytic performances of PVDF membrane, which mitigated the membrane fouling effectively. This novel hybrid membrane could accelerate the practical application of photocatalytic technology in membrane separation process.
研究领域:
材料科学
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环境工程
·
膜技术
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DOI
高影响因子
Water
·
2016
·Vol. 8
·期 4
·134
·
IF 1.687
Mingquan Wang,Fangshu Qu,Ruibao Jia,Shaohua Sun,Guibai Li,Heng Liang
Steroidal estrogens are a representative type of endocrine-disrupting chemical contaminant that has been detected in surface water. In this paper, modified polyvinylidene fluoride (PVDF) membranes were prepared by adding different amounts of polyvinyl pyrrolidone (PVP) and nano-TiO2particles. PVDF-PVP membrane adsorption, UV photolysis and PVDF-PVP-TiO2membrane photocatalysis performance were investigated by considering the rejection of estrone (E1) and 17β-estradiol (E2) in the cross-flow filtration experiments. The mechanism of photocatalytic degradation on TiO2-doped PVDF membranes was also evaluated. The results from the study indicated that adding PVP and nano-TiO2appropriately in PVDF membranes could be an effective method for better E1and E2 rejection due to adsorption and photocatalytic degradation.Keywords:steroidal estrogens;estrone;17β-estradiol;PVDF-PVP-TiO2ultrafiltration membrane;photocatalysis;water
研究领域:
环境科学
·
生物学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wen Li,Yongrun Dong,Ting Xie,Tongzhou Li,Chuang Ning,Tao Huang,Zequan Li,Wei Gao,Bingsuo Zou
Lead-free double perovskites (DPs) have superior phase stability and optical properties, which make them competitive for future applications in illumination and displays. However, the preparation of DPs was mainly based on high-temperature heating and hydrochloric acid as a solvent to form powders, which increased the risk and cost of the preparation process and limited its further application. In this study, the growth of Cs2NaInCl6: Sb3+ DPs in polyvinylidene difluoride (PVDF) films was achieved using an in situ fabrication strategy with DMSO as the solvent. The prepared Cs2NaInCl6: Sb3+@PVDF composite films (CFs) can achieve a bright blue emission under 302 nm irradiation. To achieve the optimal luminescent performance of CFs, the photoluminescence (PL) intensity of Cs2NaInCl6: Sb3+@PVDF CFs under various in situ preparation conditions was compared. In addition, the photoluminescence quantum yield (PLQY) of CFs was increased from 0.72% to 83.77% by adjusting the doping amount of Sb3+, and the fluorescence lifetimes t1 and t2 were 131.08 and 1048.52 ns, respectively. Temperature-dependent PL spectroscopy and density functional theory (DFT) calculations indicate that these excellent optical properties are derived from the self-trapped excitons (STEs) at the [SbCl6]3– octahedron and [InCl6]3– octahedron connected via Cl–Na–Cl. The CFs also demonstrated excellent environmental stability, maintaining a relatively stable PL intensity even under conditions of water immersion, high temperatures, and ultraviolet (UV) radiation. Finally, we used the CFs to assemble a blue light-emitting device (LED), which showed good and stable blue emission performance at different currents. This work can provide a new idea for preparing DPs, which is conducive to promoting their commercial application in high-performance optoelectronic devices.
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Xia Fu,Liping Zhu,Songmiao Liang,Yan Jin,Shuguang Yang
While polyvinylidene fluoride (PVDF) is widely used as a commercial UF membrane material, PVDF membrane often encounters fouling problems which significantly reduce the separation performance and service life of membrane. In this work, a special fluoro-contained polymer, sulfonated poly(α,β,β-trifluorostyrene) (SPTFS), is used to improve the hydrophilicity of PVDF membrane, thus to enhance the water flux and antifouling property of the membrane. PVDF membranes with different doping amount of SPTFS are prepared through conventional non-solvent induced phase separation method. Effects of doping SPTFS on the surface morphology , porosity, water contact angle and zeta potential of the prepared membranes are investigated. Compared with the pristine PVDF membrane, the SPTFS-doped membranes show improved hydrophilic property with enlarged finger-like pore structure , decreased water contact angle and higher negative surface charge density, as well as the increased filtration water flux. The enhanced anti-fouling property of the membrane is demonstrated by the cyclic filtration test and the in-situ monitoring of the adsorption and desorption of pollutants using a quartz crystal microbalance.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 29
·17505-17515
·
IF 10.733
Tiantian Li,Qile Fang,Haibo Lin,Fu Liu
Solar steam generation has recently attracted intense attention due to its high solar energy efficiency. However, the state-of-the-art solar distillators are usually composed of solar absorption, water supply and thermal insulation accessories separately, which complicate the fabrication and utilization of the device. Here, a thin polymeric membrane with an asymmetric structure and asymmetric wettability is fabricated for simplifying the vapour generation device. The simplified membrane can integrate enhanced solar harvesting, insulating, water drawing, steam transpiration and self-floating properties in a piece of a polyvinylidene fluoride (PVDF) membrane. The top hydrophilic layer loaded with gold nanoparticles (AuNPs) or carbon black (CB) exhibits enhanced broadband light absorption due to the synergistic effect of AuNPs (or CB) and water. The bottom hydrophobic layer facilitated the heat confinement via reducing the heat conduction and minimizing the water pathway through a round edge. This integrative PVDF membrane shows superior performances compared with traditional complex solar steam generation devices. The simplified thin-film distillator allows us to reclaim purified water without recourse to any other accessories, e.g. insulating foam, water path paper or support.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2014
·Vol. 3
·期 6
·1250-1260
·
IF 0
Y. Feng,W. L. Li,Y. F. Hou,Y. Yu,W. P. Cao,T. D. Zhang,W. D. Fei
Polymer based composites with high dielectric constant were successfully fabricated using BaTiO3 nanowires with high aspect ratio as inorganic filler and PVDF-HFP as polymer matrix. PVDF-HFP/BaTiO3 nanoparticles composites were also prepared as a contrast. The BaTiO3 nanowires were synthesized via one-step hydrothermal method. The BaTiO3 nanowires and its two types of composites were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. For the composites, breakdown strength measurements, tensile tests and broadband dielectric spectroscopy analyses were also carried out. The results show that the two types of fillers are homogeneously dispersed in the matrix. The dielectric constant of composites filled by BaTiO3 nanowires is larger than that filled by BaTiO3 nanoparticles at the same content. Stronger interfacial polarization was found in PVDF-HFP/BaTiO3 nanowire composites. Two theoretical models were employed to predict the dielectric constants of composites, and the experimental data were consistent with the estimated trend. The enhanced dielectric properties of PVDF-HFP/BaTiO3 nanowire composites are attributed to the superior interfacial polarization and high aspect ratio of BaTiO3 nanowires.
研究领域:
材料科学
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电气工程
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产品关联
DOI
危险品化学品经营许可证（带存储）