JOURNAL OF MEMBRANE SCIENCE
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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
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Dawu Lv,Wenfeng Shen,Weigang Chen,Ruiqin Tan,Lei Xu,Weijie Song
Improved ammonia (NH 3 ) sensor is proposed based on polyaniline (PANI) with poly(styrene sulfonic acid) (PSS) as an additive, which was produced by in-suit polymerization of aniline on flexible porous polyvinylidene-fluoride (PVDF) membranes and then treated with PSS aqueous solution. The whole film sensor fabrication process was low-cost and convenient in operation, suitable for large-scale commercial production. The results demonstrated that the appropriate addition of PSS could significantly improve the sensor response to NH 3 . The PSS-PANI/PVDF film sensor response was improved to approximately 70%, which was 2.8 times higher than that of the pure PANI/PVDF film with 25% response towards 1 ppm NH 3 at room temperature. Furthermore, it still showed an excellent response of 9.4% for 0.1 ppm NH 3 . The fabricated film sensor showed remarkable long-term stability with response decreases less than 5% after 30 days, and excellent flexibility under 10,000 repeated bending times with a response value degradation of only 15.1% towards 1 ppm NH 3 . The flexible PSS-PANI/PVDF film offers potential applications in smart wearable devices for detecting sub-ppm NH 3 under ambient conditions.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Zhenghua Guo,Yi Yang,Shang Xiang,Xi Du,Zhenyu Cui,Benqiao He,Hong Wang,Jianxin Li,Tao Jiang
In this work, poly(vinylidene fluoride) (PVDF) flat membrane was prepared via “In-situ template-TIPS” technology using poly(vinylpyrrolidone) (PVP) as template. The membrane formation mechanism and microstructure evolution of this method were expounded for the first time. The effect of PVP content on the crystallization behavior of the dope, the microstructure, the crystallization behavior and the permeability of the membrane was investigated in detail. Interestingly, the solidification of PVP from the diluent via air-cooling at room temperature not only hindered the PVDF crystallization, but also the growth of PVP led to the formation of porous surface and eliminated the thick and dense skin layer, and thus formed the inter-connected structure and higher porosity (The maximum porosity is 88.9%). The maximum pure water flux reached as high as 3420 L m −2 h −1 . The membrane also indicated an excellent performance in rejection of bacteria and separation of “petroleum ether/water” emulsion (nearly 100%). The α crystal phase was formed for the membrane by air-cooling at room temperature. The non-isothermal crystallization kinetics revealed that PVP can act as a heterogeneous nucleating agent for PVDF crystallization and hindered the growth of PVDF crystal in three-dimension. The research presented a novel and simple idea for tailoring the microstructure of membrane via TIPS process.
研究领域:
材料科学
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膜技术
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DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 29
·17505-17515
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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
APPLIED SURFACE SCIENCE
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2017
·
IF 3.387
Fengtao Chen,Xingxing Shi,Xiaobing Chen,Wenxing Chen
A facile strategy to improve the hydrophilicity and the antifouling properties of poly(vinylidene fluoride) (PVDF) membranes, a functional monomer of 4-methacrylamidobenzenesulfonic acid (MABS), was designed and synthesized through the amidation reaction between 2-methylacryloyl chloride and sulfanilic acid. Utilizing PVDF and the obtained MABS as reaction monomers, a novel amphiphilic copolymer was firstly prepared by radical polymerization method. The resulting PVDF-g-PMABS was used as a hydrophilic additive in the fabrication of PVDF porous membranes via immersion precipitation process. The surface chemical compositions and structure morphologies of as-prepared blend membranes (PVDF-g-PMABS/PVDF) were characterized by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), respectively. Contact angle measurement and cross-flow permeation test were employed to evaluate the hydrophilicity and antifouling properties of the membranes. It was found that the blend membrane with 4 wt.% PVDF-g-PMABS exhibited a noticeable pure water flux (136.34 L m −2 h −1 ) and a remarkable flux recovery ratio (FRR) of 98.60% in comparison with the pristine PVDF membrane (63.37 L m −2 h −1 and 38.67%, respectively). The enhanced performance was attributed to the synergetic effects of the strong hydrogen bonding force and the electrostatic repulsion of sulfonic groups against the protein foulants.
研究领域:
材料科学
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环境工程
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生物医学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
·
IF 3.927
Yicheng Zhang,Weiming Yu,Renjie Li,Yanchao Xu,Liguo Shen,Hongjun Lin,Bao-Qiang Liao,Guosheng Wu
The permeability-selectivity trade-off remains the major drawback limiting application of membrane technology. This study provided a new strategy to break through this trade-off. A novel conductive membrane prepared by electroless Ni plating of the polyvinylidene fluoride (PVDF) membrane was used for dyeing wastewater treatment by applying an electric field. Series analyses demonstrated success of immobilizing a Ni/NiO layer on the pristine PVDF membrane. The conductive membrane possessed improved hydrophilicity indicated by the water contact angle decrease from 75.5° to 45.0°. Moreover, the conductive PVDF membrane integrating electric field voltage of 20 V simultaneously possessed high selectivity (97.93% rejection) and extremely high permeability (202.51 ± 9.63 L m −2 h −1 at 0.1 MPa) for filtration of Congo red (CR) solution, significantly breaking through the permeability-selectivity trade-off. The filtration performance was quite stable even after 6 filtration cycles, indicating the feasibility of the conductive membrane for long-term treatment of CR wastewater. In addition, the conductive membrane showed high antifouling ability to methylene blue (MB), rhodamine B (RB), CR and microorganisms. The conductive membranes, together with the new strategy, offered in-depth insights into membrane fabrication.
研究领域:
环境科学
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材料科学
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污水处理
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2017
·
IF 3.359
Ji-Hao Zuo,Peng Cheng,Xing-Fan Chen,Xi Yan,Ya-Jun Guo,Wan-Zhong Lang
Poly(vinylidene fluoride) (PVDF) membranes are prepared via thermally induced phase separation (TIPS) method with cold air as quenching air (PVDF T-air ), and surface-modified by polydopamine. The morphologies, surface chemistry, pore size, porosity, mechanical properties, separation performance in oil/water emulsion separation and antifouling ability of the prepared PVDF membranes were studied in detail. Compared with the PVDF membranes prepared by traditional TIPS method with cold water as quenching bath (PVDF T-water ), the PVDF T-air membranes are not only more environmental friendly and energy saving, but also show ultrahigh permeation flux without sacrificing oil rejections and improve mechanical strength. After being modified by polydopamine, the rich hydrophilic groups in dopamine endow the PVDF T-air membranes with excellent hydrophilic and underwater oleophobicity. The optimal membrane sample (M-3) shows a permeation flux of 3855.6 L·m −2 ·h −1 ·bar −1 for pure water and the ones above 2600 L·m −2 ·h −1 ·bar −1 for oil/water emulsions accompanied with above 98.5% oil rejections for three oil/water emulsions (n-hexane, toluene and petroleum ether). The results demonstrate that novel PVDF microfiltration membranes with ultrahigh permeation flux and oil rejection are prepared for oil/water emulsion separations.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2017
·
IF 6.035
Kang Gao,Yanlei Su,Linjie Zhou,Mingrui He,Runnan Zhang,Yanan Liu,Zhongyi Jiang
Antifouling mechanisms are critical to membrane structure-property relationship. Currently, most researches focus on either passive fouling-resistant, fouling-release mechanisms or active antibacterial mechanism, the integration of active and passive antifouling mechanisms is much less explored. In this study, a novel modifier bearing three functional segments was designed and utilized for antifouling and antibacterial membrane surface construction. In detail, a block-like copolymer comprising low surface energy poly(hexafluorobutyl methacrylate) (PHFBM), hydrophilic poly(poly(ethylene glycol) methyl ether methacrylate) (PEGMA) and antibacterial poly[2-(methacryloyoxy)ethyl trimethylammonium chloride] (PMTAC) quaternary ammonium salt segments was prepared via free radical polymerization . The copolymer was employed for fabricating PVDF membranes by non-solvent induced phase separation method. The surface enrichment of copolymer was confirmed by XPS analysis . The PHFBM and PEGMA segments created passive fouling-release, fouling-resistant mechanisms whereas the PMTAC segments created active antibacterial mechanism on PVDF membrane surfaces. When utilized for oil/water emulsion filtration, the total flux decline ratio of PVDF/PHFBM-PEGMA-PMTAC membrane was as low as 6.3% and the flux recovery ratio reached nearly 100%. Besides, the antibacterial activity against E. coli and S. aureus was higher than 99%. Hopefully, the strategy of active-passive integrated mechanisms in this study can be applicable to construct diverse antifouling surfaces for water treatment related applications.
研究领域:
材料科学
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环境工程
·
生物医学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Hongai Zheng,Yao Zhou,Derui Wang,Meilin Zhu,Xin Sun,Shuangyan Jiang,Yankun Fan,Daquan Zhang,Lizhi Zhang
Catalytic membrane reactors (CMR) based on the sulfate-based advanced oxidation processes (SR-AOPs) have exhibited fantastic applications prospects in water treatment. We synthesized Cu-MOF-74 by an environmentally friendly and facile method, then used it as PVDF (polyvinylidene fluoride) membrane surface modification layer. The results presented that Cu-MOF-74 can significantly improve anti-fouling ability of PVDF membrane (60.9% and 64.1% anti-adsorption of dye and protein). The modified membranes exhibited relatively low flux loss. Simultaneously the modified membrane catalyzed peroxymonosulfate (PMS) to achieve 97.1% degradation efficiency of Rhodamine B (RhB) within 60 min and 90.2% dye penetration recovery within 30 min. Cu-MOF-74 exhibited greater catalytic activity than homogeneous Cu (II) and showed a wide range of pH adaptation. Finally, XPS and ESR proved that it was the redox of Cu (II)/Cu (I) in the Cu-MOF-74 structure making PMS mainly produce SO 4 - • and •OH to oxidize pollutant molecules. The modus proposed in this study may provide a more promising strategy for the preparation of high-efficiency catalytic membranes and their practical applications in wastewater treatment processes .
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
Applied Water Science
·
2021
·Vol. 11
·期 3
·1-14
·
IF 3.874
Wen Gongpu,Chen Kun,Zhang Yanhong,Zhou Yue,Pan Jun,Wang Qian,Sun Siyuan,Wang Zhaohui
A novel strategy was proposed to fabricate alkali-resistant PVDF membrane via sodium lauryl sulfate (SDS) attached to the surface of membrane and immobilized by UV-curable polyester acrylate and tri(propylene glycol) diacrylate (TPGDA). The attached anionic surfactant, SDS, on the membrane surface can resist the alkali corrosion by NaOH, and the curing of the resin can immobilize the SDS on the membrane firmly. Due to the unique alkali resistance of SDS and resin formed, the UV-curable resin-modified PVDF membrane showed greatly enhanced alkali-resistant ability. Characterization of SEM and FTIR showed that polyester acrylate and TPGDA were cured successfully under the action of 1-hydroxycyclohexyl phenyl ketone (184) and ultraviolet light. Whiteness, differential scanning calorimeter and X-ray photoelectron spectrometer characterization showed that the modified PVDF membrane had a lower degree of dehydrofluorination than the pristine PVDF membrane after alkali treatment. Results of the detailed alkali-resistant analysis indicated that the F/C ratio of the UV-curable resin-modified PVDF membrane decreased by 2.6% after alkali treatment compared to pristine PVDF membrane decreased by 19.28%. The alkali-resistant performance was mainly attributed to the immobilized SDS. This study provided a facile and scalable method for designing alkali-resistant PVDF membrane, which shows a promising potential in the treatment of alkaline wastewater and alkaline-cleaning PVDF membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Jingxuan Zhao,Hongxu Liu,Peng Xue,Song Tian,Shulin Sun,Xue Lv
An adsorptive membrane filtration based on polyvinylidene fluoride (PVDF) with chitosan (CS) and carboxylated carbon nanotubes (CNTs-COOH) is prepared by method of phase conversion, and the PVDF-CS@CNTs-COOH membranes can effectively separate anionic and cationic dye wastewater. Compared to pure PVDF membranes, PVDF-CS@CNTs-COOH increases pure water flux from 36.39 (L·m −2 ·h −1 ) to 85.25 (L·m −2 ·h −1 ), an increase of nearly 230%. The membrane exhibits excellent rejection performance in the filtration of six types of dye wastewater. The modified membranes also performed well in terms of rejection of mixed anionic and cationic dyes and also have a high performance in recycling, with a flux of over 94% for both anionic and cationic dyes. In addition, the adsorption curve fitting results showed that the adsorption process was more consistent with the pseudo-second-order adsorption kinetic model and Langmuir mode.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Jinmin Zhao,Juanli Chen,Liting He,Youhua Cao,Chengqiang Peng,Jing Fang,Zhongyu Duan,Hao Li
Polyvinylidene fluoride membranes (PVDFMs) are frequently used in oil-water separation due to their stable properties, high porosity, and modification easily. However, the pollution, low separation efficiency, and low recovery rate of PVDFMs have limited the oil sewage treatment. This work is based on dopamine-modified PVDFMs, which prepared hydrophilic separation membranes by attaching hydroxymethylated lignin (HAL) to PVDFMs. Lignin was hydroxymethylated to improve its hydrophilicity. Additionally, HAL was assembled on the surface of PVDFMs with the effect of dopamine (DA) and 3-aminopropyltriethoxysilane (KH550). The effect of the ratio of DA and KH550 (D: K) and HAL concentration on the hydrophilic effect was explored. The modified membranes exhibited considerable separation efficiency (>99 %) for several kinds of oil-water emulsions and could be recycled multiple times. This green modification method using lignin provides an environmentally friendly solution for modifying PVDFMs.
研究领域:
环境科学
·
材料科学
✓ 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）