文献类型：期刊文献

英文题名：Controllable preparation of SiO2-PDMS-PVDF/PTFE membrane for low-concentration alcohol-water solution pervaporation

作者：Sun, Zi-Qi[1];Xu, Zhen-Liang[1,3];Su, Ye-Hen[1];Xu, Jian-Xiong[1];Xu, Sun-Jie[1,2,3]

机构：[1]East China Univ Sci & Technol, Chem Engn Res Ctr, State Key Lab Chem Engn, Membrane Sci & Engn R&D Lab,Sch Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Elect Chem Innovat Inst, Shanghai 200237, Peoples R China

年份：2026

卷号：88

外文期刊名：JOURNAL OF WATER PROCESS ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001778984400001)】；

基金：The authors gratefully acknowledge the financial support received from National Natural Science Foundation of China (22078092, 22208101 and 21176067) and 2025 Basic Research Plan of Science and Technology Commission of Shanghai Municipality (25JD1404900).

语种：英文

外文关键词：Polydimethylsiloxane; Electrospinning; Pervaporation; IPA/water separation

摘要：Bio-alcohol fuels serve as renewable alternatives to fossil fuels. However, alcohol-water mixtures obtained from fermentation are typically dilute (5-10 wt%), and their efficient separation remains a major technical challenge that limits the economic viability of biorefinery processes. Polydimethylsiloxane (PDMS) has attracted considerable attention as a potential membrane material for alcohol dehydration due to its strong hydrophobic nature and high permeability toward organic species. In this study, a hydrophobic silica (SiO2)-modified PDMS/PVDF composite membrane was fabricated via electrospinning on a Polytetrafluroethylene (PTFE) woven tube for the pervaporation separation of low-concentration alcohol-water solutions. The incorporation of SiO2 enhanced membrane hydrophobicity, tailored surface roughness, and effectively suppressed swelling. The influence of SiO2 content and operating temperature on membrane performance was systematically examined, along with an evaluation of long-term stability. Experimental results showed that the addition of 1.5% SiO2 significantly improved the separation performance for a 5 wt% ethanol-water mixture, increasing the separation factor from 6.47 to 9.95. Higher temperatures led to increased flux while selectivity remained relatively stable within a certain range. The optimized membrane exhibited excellent long-term stability and was also evaluated for 5 wt% isopropanol-water separation for comparison to understand the influence of alcohol hydrophobicity.