膜科学与技术

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Hydrophilic modification of electrospun polyvinylidene fluoride membranes and the oil/water separation performance driven by self-weight

Authors： Lv Yishu, Meng Jiao, Zhang Xuan, Chen Yan, Lang Wanzhong

Units： The Education Ministry Key Lab of Resource Chemistry, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China

KeyWords： polyvinylidene fluoride membrane；electrospinning; micro-filtration membranes; oil-in-water emulsion separation

ClassificationCode：TQ31

year,volume(issue):pagination： 2022,42(4):105-111

Abstract：

In order to improve the oil-water separation performance of polyvinylidene fluoride (PVDF) membrane, the CaAlg-PDA/PVDF composite membranes were prepared by depositing polydopamine (PDA) and hydrogel calcium alginate (CaAlg) on the surface of electrospun PVDF base membrane successively. The strong adhesion of PDA and the affinity between CaAlg and PDA were used to enhance the performance stability of CaAlg-PDA/PVDF membranes. The results showed that the pore size of PVDF membrane didn’t change much after self-polymerization in 2 mg·mL-1 dopamine solution. The water wettability of CaAlg-PDA/PVDF composite membrane was significantly improved after further hydrogel modification, and the average pore size and porosity of PVDF composite membrane were significantly decreased. The CaAlg-PDA/PVDF composite membranes have the highest rejection of 99.9% for petroleum ether emulsion oil, and the water permeance is higher than 2.0×104 L/(m2·h·MPa). For emulsified n-hexane solution, the highest rejection also can achieve 99.9%, and the water permeance is higher than 3.2×104 L/(m2·h·MPa). Compared with the CaAlg/PVDF membranes, the CaAlg-PDA/PVDF composite membranes show better performance stability.

Funds：

上海市地方能力建设项目（14520502900）；上海绿色能源化工工程技术研究中心(18DZ2254200)；国家自然科学基金 (22005191)。

AuthorIntro：

吕艺舒（2001-），女，山西运城人，本科生，主要从事膜分离技术研究

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