Preparation, characterization of P(VDF-HFP)/[bmim]BF₄ ionic liquids hybrid membranes and their pervaporation performance for ethyl acetate recovery from water

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• 作者：Dong Yongquan ; ^{dongyongquan@gmail.com} ; Wang Ming ; Chen Lin ; Li Mingjun
• 关键词：P(VDF-HFP) ; [bmim]BF4 ionic liquids ; Hybrid membrane ; Pervaporation ; Ethyl acetate
• 刊名：Desalination
• 出版年：2012
• 期刊代码：24_00119164
• 类别：ce
• 出版时间：1 June, 2012
• 卷：295
• 期：Complete
• 页码：53-60
• 文件大小：1925 K

摘要

Poly(vinylidene-fluoride-hexafluoropropene)/1-butyl-3-methyl-imidazolium-tetrafluoroborate (P(VDF-HFP)/[bmim]BF₄) hybrid membranes were prepared by solvent evaporation methods using P(VDF-HFP) as membrane matrix and acetone-[bmim]BF₄ mixtures as solvent. The surface and cross-sectional morphology of the membranes were characterized by using Scanning Electro Micrograph (SEM), and swelling behavior and pervaporation performance were investigated for separating ethyl acetate/water. The SEM results showed that [bmim]BF₄ was successfully embedded in the P(VDF-HFP) matrix. Inclusion of [bmim]BF₄ in the P(VDF-HFP) matrix enhanced diffusion coefficient of EtAc. As [bmim]BF₄ content increased from 0 to 5 wt.%, the total permeation flux of the membrane increased from 433.21 to 655.85 g.m^鈭?#xA0;2.h^鈭?#xA0;1 and the separation factor increased from 75.75 to 143.88 for 4 wt.%EtAc/water at 45 掳C. The TGA and stability experiments further demonstrated that hybrid membranes had good thermal stability during separation process.