DESALINATION
·
2025
·
IF 9.8
Ao Ma,Yan Bai,Jie Han,Qi Qi,Chengbing Ma,Yujuan Zhang,Tao Xie,Guohui Zhang,Huiquan Li,Yunkun Wang
Municipal sewage purification is an important means to alleviate water shortage. Polyvinylidene fluoride (PVDF) is a kind of ultrafiltration membrane widely used in water treatment but easy to incur biological contamination in the membrane separation process. Herein, a sequence of PVDF-based ultrafiltration membranes grafted with varying quaternary amines were designed to obtain fabulous antibacterial performance. Firstly, the antibacterial block copolymer composed of PVDF and quaternary ammonium salts is synthesized using the atom transfer radical polymerization technique. Subsequently, the copolymer is integrated into the matrix membrane through a phase inversion method. With a gradient change of alkyl chain lengths, we further explore the relationship between substituent structure and antibacterial properties. All functionalized membranes showed exceptional antibacterial activity with the highest efficiency of 83.3 % to E. coli and 69.1 % to E. faecalis. The as-anticipated properties were ascribed to the puncture effect shared by alkyl group and protective effect imparted by hydrophilic layer. During a series of cross-flow filtration experiment lasting for 10 h, the normalized flux retention was increased by a maximum of 1.52 times compared to pristine PVDF membrane. These results further highlight that the PVDF-based membrane functionalized by quaternary ammonium salt grafting is capacity of praiseworthy antibiofouling ability. Overall, our research provides a promising strategy to fabricate fouling-resistant ultrafiltration membranes and substantiates their potential utility in the realm of wastewater treatment.
研究领域:
环境科学
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材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Junqiang Zhao,Hongrui Han,Qiqi Wang,Chengyou Yan,Dongyang Li,Jing Yang,Xia Feng,Ning Yang,Yiping Zhao,Li Chen
To fabricate hydrophilic and anti-fouling PVDF ultrafiltration membrane, a kind of tailor-made symmetrical amphiphilic triblock copolymer , polyacryloylmorpholine- b -poly (methyl methacrylate)- b -polyacryloylmorpholine (PACMO- b -PMMA- b -PACMO, termed as PAMA), was prepared via RAFT polymerization and employed as an in situ surface segregation modifier. FTIR, 1 H NMR, and GPC were used to verify the well-defined chemical structure of PAMA. The hydrophilic PACMO segments of PAMA were enriched on the surface of membrane skin and interior pores as confirmed by ATR-FTIR, XPS , EDX, and water contact angle tests, endowing the blend membranes with outstanding hydrophilicity . The different cross-sectional and surface morphologies of the PVDF/PAMA blend membranes indicated that the introduction of PAMA modifiers could manipulate membrane structure due to their strong pore-forming ability. Compared with the pure PVDF membrane, PVDF/PAMA blend membranes showed higher permeability for water (28.1 times higher), excellent rejection for bovine serum albumin (up to 98.3%), and enhanced fouling resistance with a higher flux recovery ratio (up to 98.1%). Therefore, the approach of in situ surface segregation employed the RAFT mediated well-defined amphiphilic PAMA triblock copolymer modifiers for the preparation of anti-fouling PVDF membranes showed a great potential in water purification .
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2016
·
IF 3.299
Haiye Wang,Xinzhen Zhao,Chunju He
The polydimethylsiloxane modified silica (SiO 2 -g-PDMS) nanoparticles with hydrophilic core and hydrophobic shell are employed for the hybridization modification of PVDF ultrafiltration membrane to improve the separation and antifouling performances. The results suggest the modified SiO 2 -g-PDMS nanoparticles exhibit improved dispersion and significant amphiphilic characteristics, and the wetting properties of membrane surface and mimetic matrix of hybrid PVDF membranes are distinctly different with the contact angle values at 105° and 15°, respectively. In addition, the added SiO 2 -g-PDMS nanoparticles significantly improve the fouling repulsion and fouling release properties of hybrid PVDF membranes, the anti-adsorption ability and water flux recovery ratio (FRR-W) of hybrid PVDF membranes to the two typical pollutants of bovine serum albumin (BSA) and humic acid (HA) have been significantly improved. This article aims to provide a simple way to improve the antifouling performance of PVDF ultrafiltration membrane with dual-mode multi-functional modifier.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Junwei Chen,Qianwen Yu,Mingxia Wang,Dan Liu,Linfang Dong,Zhenyu Cui,Benqiao He,Jianxin Li,Feng Yan
The treatment of various oily wastewaters generated in human production and life has been a huge challenge in recent years. Responsive materials for controlled wettability surface have a great potential for oil-water separation. Inspired by the superior pH-responsive of poly (2-( N, N′ -dimethylamino) ethyl methacrylate) (PDMAEMA), a pH-responsive self-cleaning PVDF ultrafiltration membrane containing both carboxyl and tertiary amine groups were prepared by a simple grafting and co-blending method. The membrane fabrication process consisted of introducing 3-Dimethylaminopropylamine (DMPA) into the SMA side chain, resulting in the creation of the amphiphilic polymer DMPA@SMA. This polymer was then mixed with PVDF to produce DMPA@SMA/PVDF membranes. The optimized DMPA@SMA/PVDF membranes showed excellent superhydrophilicity/underwater superhydrophobicity, with a water contact angle of 0° and an underwater oil contact angle higher than 150° for crude oil. These endowed the as prepared membrane with a high pure water flux of 852 L·m −2 ·h −1 and anti-crude-oil-adhesion property. The separation efficiency exceeded 98% for various surfactant-stabilized oil-in-water emulsions, whether it’s positively charged emulsion or negatively charged emulsion. More interestingly, the carboxyl and tertiary amine groups presented the membrane with pH responsivity, and the membrane surface can be triggered by acid or alkali with self-cleaning performance. Strategy proposed in the present work offers a convenient and effective way to prepare membranes treating oil-in-water emulsions with either negative or positive charges.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2017
·
IF 6.035
Hassan Younas,Hongwei Bai,Jiahui Shao,Qiaochu Han,Yuhan Ling,Yiliang He
The hydrophilicity of PVDF membrane is playing an enormously important role in its widespread water treatment fields considering the excellent intrinsic properties of PVDF raw materials. Rather than the conventional surface modification or hybridization, herein, we report a novel approach to prepare super-hydrophilic PVDF ultrafiltration (UF) membrane by creating a prefabricated super-hydrophilic surface of inorganic TiO 2 nanoparticles (NPs). The resultant membrane [prepared by prefabrication surface adhesion of TiO 2 NPs on PVDF-PEG-TiO 2 hybrid membrane (SaT-PPT)] has a uniform distribution of TiO 2 NPs not only on the membrane surface but also within membrane matrix, this will maximize the super-hydrophilic feature throughout the membrane: from inner porous structures to outer surfaces, and will avoid “dead-corner” to block fast water pass through. The performances of SaT-PPT membrane as compared with the control membranes (PVDF-PEG, and PVDF-PEG with TiO 2 anchored only at surface) were investigated in terms of humic acid (HA) rejection, flux and flux decline in lab-made cross flow UF experiments with and without UV irradiation. It indicated that SaT-PPT membrane exhibited the highest hydrophilicity and flux, lowest flux decline and total resistance, but still with the highest HA rejection rate. In addition, SaT-PPT membrane showed the highest flux recovery after simple physical cleaning to extend the longer life span of membrane. It is reasonable to believe that our developed SaT-PPT membranes will provide insightful engineering practices to benefit the broad water treatment applications.
研究领域:
材料科学
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环境工程
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水处理
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 9
·9503-9519
·
IF 3.056
Xie Wanying,Li Ji,Sun Feiyun,Dong Wenyi
The influence of ultrasonication on membrane performance was investigated by two ultrasonication modes, direct and indirect ultrasonication as pretreatment, and simply improved PVDF-TiO 2 membranes’ performance was systematically compared. Ultrasound intensity of 100% and ultrasonication time ranged from 1 to 2 h positively affect membrane permeability. Characterization results manifested that membrane structure was eventually optimized with an even nano-TiO 2 dispersion by direct ultrasonication. Analysis of surface roughness reflected that PVDF-TiO 2 (MS-U2) surface morphological pattern was peak-valley structure that resisted fouling greatly. A good fitting of experimental result and Tansel’s simulation illustrated that anti-fouling ability was realized direct ultrasonication modified membrane. PVDF-TiO 2 (MS-U2) membrane showing the lowest | τ | reflecting the time required to reach a certain level of the fouling degree was the lowest. Relying upon modified Hermia’s model analysis, protein blockage within the membrane pore was one major fouling mechanism; surface blockage degree of PVDF-TiO 2 (MS-U2) was relative slight. Fouling mechanism analyzed by two models reflected that PVDF-TiO 2 (MS-U2) membrane exhibited a higher anti-protein fouling ability during cross-flow filtration process.
研究领域:
材料科学
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环境工程
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膜技术
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）