Colloidal silica/PDMS pervaporation membranes for pervaporative separation of n-butanol from aqueous solution

doi:10.16085/j.issn.1000-6613.2015.10.028

Abstract

Abstract: Based on the emulsion film forming technology, colloidal silica/PDMS hybrid membranes were prepared with colloidal silica as filler, and used for the pervaporative separation of n-butanol from aqueous solution. The membranes were analyzed by FI-IR, and characterized with morphology, thermal stability, contact angle, and mechanical property. The effect of colloidal silica content on membrane pervaporative performance was studied. The results showed that the incorporation of colloidal silica improved the pervaporative performance obviously; colloidal silica combined with PDMS substrates very well, and there was no obvious phase interface. At 40℃, feed concentration of 1%, with an increase of colloidal silica content, both n-butanol/water selectivity and permeability for n-butanol increased first and then decreased. When the colloidal silica content is 3.75%, the selectivity was the highest, and reached 9.03; while permeability for n-butanol reached the highest, 2.9×10⁶Barrer, when the content is 7.5%.

Key words: membranes, colloidal silica, emulsions, hyperbranched polysiloxane, pervaporation

摘要： 基于乳液成膜技术,以硅溶胶为填充剂,制备了硅溶胶聚二甲基硅氧烷/PDMS杂化膜,用于分离水中正丁醇。对膜进行了FI-IR分析及形貌、热稳定性、接触角和力学性能表征;研究了硅溶胶的加入对膜渗透汽化性能的影响。结果表明,硅溶胶与PDMS基质结合良好,没有明显相界面,膜的渗透汽化性能明显提高。在料液质量分数为1%、操作温度为40℃时,随着膜中硅溶胶含量的增加,膜的分离选择性和对丁醇的渗透性均呈现先升高后下降的趋势;在硅溶胶含量为3.75%时,分离选择性高达9.03;在硅溶胶含量为7.5%时,膜对丁醇的渗透性高达2.9×10⁶Barrer。

关键词: 膜, 硅溶胶, 乳液, 超支化聚硅氧烷, 渗透汽化

CLC Number:

TQ028.8

TANG Jun, CHEN Deqiang, ZHANG Chunfang, BAI Yunxiang, GU Jin, SUN Yuping. Colloidal silica/PDMS pervaporation membranes for pervaporative separation of n-butanol from aqueous solution[J]. Chemical Industry and Engineering Progree, 2015, 34(10): 3700-3705.

唐郡, 陈德强, 张春芳, 白云翔, 顾瑾, 孙余凭. 硅溶胶/PDMS渗透汽化膜的制备及分离水中正丁醇[J]. 化工进展, 2015, 34(10): 3700-3705.

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