SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Changqing Miao,Yujia Tong,Fiona Hammond Quarcoo,Xiaohui Ju,Weixing Li
Mussels in nature can adhere to the surface of hydrophobic substances by secreting adhesive substances, which has attracted wide attention by coating method for membrane modification. However, complicated processing procedures remain major problems. Here, we proposed a simple, mild and fast surface coating method. Proanthocyanidins (PC) react with 3-aminopropyl triethoxysilane (KH550) under the accelerated action of the oxidant ammonium persulfate (APS) at room temperature to form a polyphenol network. The hydrophilic network coating was constructed on PVDF membrane by surface co-deposition method for 1 h, which could effectively separate different emulsions. The water permeability of modified membrane was 18,271 L∙m −2 ∙h −1 ∙bar −1 . The permeability for separating isooctane-in-water emulsion arrived at 14,223 L∙m −2 ∙h −1 ∙bar −1 and the oil rejection rate was 99.6 %. After ten cycles, the separation flux was 10,836 L∙m −2 ∙h −1 ∙bar −1 with the rejection rate of 98.8 %. Modified membranes were soaked in acid and alkali salt solutions of different pH values for 30 days, and maintained good underwater oleophobic performance (>156°). The developed membrane showed excellent separation performance, oleophobic property and acid-base stability. The proposed membrane modification strategy was prospective for efficient separation of oily wastewater.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
Environmental Science-Water Research & Technology
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2025
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IF 3.1
Zhongsen Yan,Zihan Tang,Yongyuan Wang,Yuling Jiang,Juxiang Jin,Haiqing Chang,Yujia Peng,Fangshu Qu
Landfill leachate contains high concentrations of hazardous pollutants that require effective treatment before discharge. Membrane distillation (MD) has emerged as a promising approach for leachate treatment, but membrane fouling remains a major challenge for its practical application. This study introduces an innovative in-situ catalytic MD membrane to improve antifouling performance. The MnO₂-doped polyvinylidene fluoride (M-PVDF) membrane was prepared via electrospinning, incorporating an optimized amount of MnO₂ and fluoroalkyl modifier. The M-PVDF membrane demonstrated excellent retention of landfill leachate pollutants across all test cycles, achieving retention rates above 99.23% for non-ammonia foulants. No membrane wetting was observed in M-PVDF during the cyclic tests, whereas conventional PVDF membranes exhibited wetting in the third cycle. The fouled M-PVDF membrane was effectively restored after cleaning with H₂O₂, regaining its original flux and demonstrating robust self-cleaning capabilities. This performance is attributed to the synergistic effects of micro-nano bubbles and MnO₂-catalyzed H₂O₂ free radicals. The proposed in-situ catalytic self-cleaning strategy significantly enhances the antifouling properties of MD, providing a sustainable solution for high-salinity wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Coatings
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2025
·Vol. 15
·期 8
·965
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IF 2.8
Wei Zhang,Xuran Zhu,Baoan Li,Boyang Hu,Leyu Shen,Yanzong Meng,Haifeng Gao
Commercial hydrophobic membranes encounter severe problems such as membrane wetting and membrane fouling under extreme conditions, which affect membrane separation performance. To enhance the anti-fouling abilities of hydrophobic membranes, a composite membrane with omniphobic characteristics was fabricated successfully in this paper. Titanium dioxide (TiO2) nanoparticles were in-situ grown via the hydrothermal synthesis method, and then fluorosilane with low surface energy was grafted on polyvinylidene fluoride (PVDF) membranes. Subsequently, the morphologies, chemical compositions, wetting properties and structural parameters of composite membranes were characterized systematically. Various contaminants were added to the feed to investigate the anti-fouling and anti-wetting performances of the composite membrane in membrane distillation tests. The results showed that butyl titanate was first hydrolyzed to form titanium hydroxide (Ti(OH)4) and then it was dehydrated to form TiO2in the hydrothermal environment. TiO2crystals continued to grow and formed rough morphology with micro-nano synergistic distribution, which is similar to a “sunflower” disk composed of cubic clusters and nanopillars. Meanwhile, fluorosilane successfully was grafted onto TiO2. The contact angles of deionized water, 0.4 mM sodium dodecyl sulfate (SDS) solution and 0.2%v/vmineral oil emulsion on the composite membrane surface were 167.3°, 162.0° and 158.5°, respectively, endowing the composite membrane with excellent omniphobic features. In direct contact membrane distillation (DCMD) tests, the composite membrane exhibited a relatively stable membrane permeate flux, and the salt rejection rate almost reached 100%. The mixture, consisting of inorganic salts, organic substances, surfactants and oil emulsions, was used as feed. In contrast, the commercial PVDF membrane flux decreased drastically and even dropped to 0 due to the membrane fouling and wetting. As for the pristine PVDF membrane, the membrane surface was covered with pollutants and membrane pores were blocked. Therefore, it was proved that the omniphobic composite membrane possesses outstanding anti-fouling and anti-wetting performance.
研究领域:
膜科学
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材料工程
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表面化学
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环境工程
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产品关联
DOI
高影响因子
Materials Today Communications
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2024
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IF 3.7
Kunyi Ma,Lin Liu,Yanan Wang,Di Wu,Qingyu Zhao,Jinjuan Xing
In this work, a new polyvinylidene fluoride nano-ultrafiltration membrane modified by graphene oxide/ titanium dioxide doped with cerium composite materials (GO/Ce-TiO 2 -PVDF) was prepared by phase inversion method. The water contact angle, porosity, pore size distribution , and photocatalytic performance of the membrane were studied. Compared with the PVDF membrane, the water contact angle of the modified membrane decreased to 36.5°, the pure water flux improved to 119.64 L·m -2 ·h -1 , and the retention rate of bovine serum albumin (BSA) was 95.3%. The synergistic effect of GO and Ce-TiO 2 could improve the photocatalytic activity of the composite membrane , and the degradation rate of BSA was 97.4%. The flux recovery rate (FRR) of the modified membrane was 82.38%, which was 22.24% higher than that of the PVDF membrane (67.39%). The FRR of the modified membrane increased to 91.54% under water cleaning and UV irradiation. Five cycle experiments showed that the permeate flux of the polluted membrane was further restored from 78.45 L·m -2 ·h -1 to 76.95 L·m -2 ·h -1 after UV irradiation, and the retention rate of BSA was maintained at about 95%. Therefore, as predicted, the GO/Ce-TiO 2 -PVDF membrane could be widely applied in the water treatment industry due to its high anti-fouling and self-cleaning performances.
研究领域:
材料科学
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环境工程
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Huiyan Wei,Xinyi Liu,Yuan Cui,Leijiao Li,Yuming Liu,Yuqin Ma,Hongji Li,Qingming Xu
Au BPs/MXene mixtures were composited with PVDF membranes by vacuum filtration, which enabled the sensitive detection. It combined electromagnetic mechanism and chemical mechanism to achieve a synergistic enhancement of the detection, resulting in a good stability of the SERS substrate. With fluorescent dyes including rhodamine 6G and methylene blue as templates for the SERS sensor, the SERS substrate possessed high sensitivity and reproducibility on account of the strong interactions between the dye molecules and the Au BPs/MXene. In addition, the photochemical performance of the composite membrane material for rhodamine 6G and methylene blue was investigated, which demonstrated the potential of AuBPs/MXene@PVDF membrane for photochemical applications. The study of the SERS detection and photochemical degradation performance of the composite membrane material in different water sources demonstrated that the excellent testing capability of the AuBPs/MXene@PVDF membrane material can be used for reliable and highly sensitive monitoring and application in water environment analysis.
研究领域:
材料科学
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环境分析
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光谱学
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产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Lingming La,Chenyu Den,Yuanbin Mo,Yanyue Lu
Nano-silica (nSiO 2 ) was synthesized in-situ by sol–gel method, then a (polyvinylidene fluoride) PVDF-nSiO 2 hydrophobic microporous composite membrane was prepared by mixing nSiO 2 sol into casting solution using non-solvent phase inversion. The effect of nSiO 2 sol addition on the surface and cross-sectional structure of the membrane, porosity, average pore size, pure water flux, membrane flux, and hydrophobic properties was investigated. Compared with the microporous membrane without nSiO 2 sol, the cross-sectional structure of the PVDF-nSiO 2 composite membrane is fully developed, the porosity is higher, the average pore diameter is larger, and the hydrophobicity is stronger. The direct contact membrane distillation (DCMD) experiment was carried out using the prepared composite membrane to simulate seawater desalination with a 30 g/L sodium chloride solution as feed solution. Compared with the microporous membrane without nSiO 2 sol added, the membrane flux was greatly improved to 31.02 kg m –2 h –1 , and the porosity of the membrane was 75%. On the previous basis, the double coagulation bath method was employed to further improve the film-forming process. The properties and structure of the composite membrane were optimized. The membrane flux was 42.7 kg m –2 h –1 , the porosity was 78.7%, and the contact angle was 127.3°. The performance of composite membrane was greatly improved.
研究领域:
材料科学
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化学工程
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环境工程
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DOI
高影响因子
iScience
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2023
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IF 5.8
Caiyun Hou,Lei Du,Yao Li,Meiwei Guo,Jiti Zhou,Sen Qiao
With growing demand for freshwater resources, membrane distillation (MD) attracts intensive attention owing to the possibility of reclaiming almost 100% freshwater with superhydrophobic membranes as the pivotal separation units. Current superhydrophobic membrane still suffers relatively complex preparation process and limited membrane flux. Herein, we developed a promising route to fabricate a high-flux superhydrophobic poly(vinylidene fluoride) (PVDF) membrane by a simple solute and solvent co-crystallization (SSCC) method, which endowed the membrane ultra-high porosity and flux. We also found that the pore size of superhydrophobic membrane can be adjusted by controlling the crystallization process of DMSO, which gave rise to membrane higher flexibility. The membrane exhibited the outperforming desalination performance even in multiple harsh environments including different temperature, salty concentration, and pH, with/without humic acid. The membrane also displayed distinguished anti-fouling performance and long-term stability, which is quite significant for practical application.
研究领域:
环境科学
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材料科学
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水处理
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2019
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IF 1.911
Ruyi Cao,Juanjuan Zhou,Weiwei Chen
Membrane fouling is a major problem in membrane bioreactors (MBRs). In this study, membrane fouling caused by membrane rejection and adsorption was study. Filtration tests indicated that membrane rejected SMP, causing membrane pore blockage and then forming a gel layer. Batch adsorption experiments showed that adsorption of SMP onto PVDF membrane was a spontaneous physical adsorption process. Meanwhile, the absolute value Δ G of adsorption of SMP onto D3520 was higher than that of adsorption of SMP onto PVDF membrane, so SMP preferentially adsorbed onto D3520 rather than PVDF membrane. Thus, the effect of ARs on reducing the SMP concentration was investigated. It was found that, 6 g of D3520 was suitable for adsorption of SMP. This physical adsorption involved external film diffusion, intra-particle diffusion, and surface adsorption. The Redlich–Peterson isotherm model performed best in terms of describing this equilibrium data. The mechanism of membrane fouling mitigation was verified by MBR simulation system. A case study of AR–MBR system was conducted. The results showed that addition of D3520 can effectively alleviate the development of membrane fouling.
研究领域:
环境工程
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水处理
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膜技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2025
·
IF 6.9
Jiankang Wang,Yajing Wang,Yuan Peng,Zhongping Yao,Peng Zhang,Taiping Xie
The limited mass transfer and sluggish reaction kinetics of traditional powder catalysts, as well as the trade-off between permeate flux and the removal efficiency of confined membranes, have significantly hindered practical application in wastewater treatment. In this work, a Co 2 CO 3 (OH) 2 /polyvinylidene fluoride (Co 2 CO 3 (OH) 2 /PVDF) confined catalytic membrane was constructed via a one-step hydrothermal method and used as a peroxymonosulfate (PMS) activator for tetracycline (TC) degradation. Surprisingly, Co 2 CO 3 (OH) 2 /PVDF achieved 99.67 % TC removal under continuous flow-through mode with an extremely short hydraulic retention time of 5.4 ms and a high permeate flux of 7085.5 L m −2 h −1 bar −1 . Furthermore, the reaction kinetic constant was five orders of magnitude higher than that under batch mode (1.07 ms −1 vs 0.37 min −1 ), demonstrating the superiority of membrane-confined catalysis in enhancing TC removal. Reactive oxygen species (ROS) scavenging experiments, electron paramagnetic resonance (EPR) spectra and electrochemical measurement revealed that the oxidative degradation of TC was dependent on cooperative attack of radicals (SO 4 • − , •OH and O 2 • − ) and non-radicals ( 1 O 2 ). Subsequently, three possible degradation pathways were proposed. This study highlighted the significance of confined effect and Co(Ⅱ) catalysis in synergistically promoting PMS activation for ultrafast TC removal, demonstrating the potential application of membrane-confined catalysis in industrial wastewater treatment.
研究领域:
环境科学
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化学工程
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催化
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材料科学
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水处理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 3.9
Xin Luo,Zhuqing Wang,Mengxia Yan,Jianhui Xin,Yongqi Yang,Longpo Zheng,Haijun Zhang
CO 2 -responsive based separation membranes are attractive in the field of membrane separation, not only for their ability to modulate the pore size of the membrane in response to CO 2 stimulation, but also for their ability to facilitate the removal of contaminants from the membrane surface. However, the introduction of CO 2 -responsive polymers by simple blending often results in membranes that are not responsive enough to last. In this study, we synthesized a hooked triblock copolymer and used it as an additive to prepare CO 2 -responsive PVDF membranes. The modified membrane combines the advantages of the PVDF material with the CO 2 response of the triblock copolymer. It not only has good CO 2 responsiveness, but also removes organic contaminants from the membrane surface well. The water flux of the hybrid membranes is 4 to 11 times higher than that of pure PVDF membranes, indicating that the triblock copolymer also has some porogenic ability. Surprisingly, the static contact angle on the membrane surface increased from 67° to 86° with the increase of the triblock copolymer content in the PVDF membrane. This suggests that modified PVDF membranes have some potential in the field of switchable oil–water separation. Graphical
研究领域:
膜科学
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材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 5
·2631-2642
·
IF 3.288
Wei Hong,Chengcai Li,Tao Tang,Huan Xu,Yuan Yu,Guojin Liu,Feng Wang,Caihong Lei,Hailin Zhu
The immobilization of photocatalysts is considered an effective approach to solve the problem of the difficult recycling of powdered nanocatalysts after photocatalytic degradation. In this paper, tin dioxide/titanium dioxide (SnO2/TiO2) composite nanoparticles with excellent photodegradation performance and poly(vinylidene fluoride) (PVDF) resin were used as raw materials to prepare composite membranes for the catalytic degradation of rhodamine B (RhB) dye via a non-solvent-induced phase separation method. Specifically, the basic properties of SnO2/TiO2 composite nanoparticles were systematically analyzed, the photocatalytic performance of SnO2/TiO2/PVDF composite membranes was thoroughly investigated, and the photocatalytic mechanism has been revealed. Experimental results showed that the SnO2/TiO2 composite photocatalyst demonstrates a higher photocatalytic activity than the single photocatalyst with the SnO2/TiO2 composite comprising Sn/Ti in a molar ratio of 1 : 6, showing the highest photocatalytic performance. After SnO2/TiO2 composite particles were used as a kind of raw material for the production of PVDF membrane, the photocatalytic degradation rate of RhB by the SnO2/TiO2/PVDF composite membrane was as high as 91.84%. Moreover, ˙OH and h+ play a very important role in the whole photocatalytic degradation process. In summary, this paper will provide an effective guidance to improve the photocatalytic degradation of SnO2/TiO2/PVDF composite membranes, which will ultimately provide a broad potential application of photocatalysis in the field of water treatment.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Jianyu Wang,Junjie Yang,Zhenyu Cui
In this study, the flat-sheet membrane of polyvinylidene fluoride (PVDF)/polystyrene-maleic anhydride (SMA) was fabricated via the thermally induced phase separation (TIPS) technique. Subsequently, a dual-functional anti-fouling hybrid separation layer was developed by co-immobilizing zwitterionic SBMA and silver nanoparticles (AgNPs) onto the polymer membrane upper surface through Michael addition reaction and in-situ dopamine generation method. An organic-inorganic hybrid layer exhibiting dual resistance to both protein fouling and microbial fouling was constructed via the "SBMA-AgNPs" synergistic modification strategy. Furthermore, the antifouling mechanism and performance of the membrane system were systematically investigated. The results demonstrated that when BSA and Escherichia coli (E. coli) were employed as organic and microbial foulant models respectively, the membrane loaded with both zwitterionic SBMA and inorganic AgNPs achieved a flux recovery ratio (FRR) of 96.8 % and antibacterial efficiency exceeding 99.9 %, significantly outperforming membranes loaded with only either AgNPs or SBMA. Meanwhile, the irreversible resistance during operation reduced to 4.5 % and the pure water flux (PWF) decay rate reduced to 20.7 %. Finally, based on the evaluation of the long-term stability and FRR of post-backwashing, the synergistic enhancement anti-fouling mechanism of "organic-inorganic" coupling was elucidated by combining the hydration layer theory of zwitterionic SBMA and the antibacterial mechanism of AgNPs. This study offers novel insights and approaches for the future advancements of water treatment membrane technology.
研究领域:
膜技术
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水处理
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材料科学
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表面改性
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）