Superhydrophobic modification of ceramic membranes for vacuum membrane distillation

doi:10.1016/j.cjche.2017.05.003

›› 2017, Vol. 25 ›› Issue (10): 1395-1401.DOI: 10.1016/j.cjche.2017.05.003

• Separation Science and Engineering • 上一篇下一篇

Superhydrophobic modification of ceramic membranes for vacuum membrane distillation

Yanhui Yang, Qianqian Liu, Haizhi Wang, Fusheng Ding, Guoshan Jin, Chunxi Li, Hong Meng

College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

收稿日期:2016-12-27 修回日期:2017-05-16 出版日期:2017-10-28 发布日期:2017-07-01
通讯作者: Hong Meng,E-mail address:menghong@mail.buct.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (51473013).

Superhydrophobic modification of ceramic membranes for vacuum membrane distillation

Yanhui Yang, Qianqian Liu, Haizhi Wang, Fusheng Ding, Guoshan Jin, Chunxi Li, Hong Meng

College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Received:2016-12-27 Revised:2017-05-16 Online:2017-10-28 Published:2017-07-01
Supported by:
Supported by the National Natural Science Foundation of China (51473013).

摘要/Abstract

摘要： The hydrophobically modified ceramic membranes have great potential for energy-efficient membrane distillation. In this work, flat-sheet ceramic membranes with a superhydrophobic surface were fabricated by grafting 1H,1H,2H,2H-perfluorooctyltrichlorosilane or 1H,1H,2H,2H-perfluorodecyltriethoxysilane and followed by ultraviolet irradiation. The surface water contact angle was improved from 46° of original ceramic membrane to 159°, which exhibited a stable and excellent superhydrophobic effect. The modified membranes showed a high flux of 27.28 kg·m^-2·h^-1 and simultaneously maintained an excellent retention rate of 99.99%, when used in vacuum membrane distillation process for treatment of a 1 wt% NaCl (75℃) aqueous solution. These results suggested that superhydrophobic modification of ceramic surface is a facile and cost-effective way to achieve higher membrane distillation performance. The superhydrophobically-modified ceramic membrane with an excellent desalination capacity would show considerable potential in practical membrane distillation utilizations.

关键词: Superhydrophobic modification, Fluoroalkylsilane, Ultraviolet irradiation, Ceramic membrane, Vacuum membrane distillation

Abstract: The hydrophobically modified ceramic membranes have great potential for energy-efficient membrane distillation. In this work, flat-sheet ceramic membranes with a superhydrophobic surface were fabricated by grafting 1H,1H,2H,2H-perfluorooctyltrichlorosilane or 1H,1H,2H,2H-perfluorodecyltriethoxysilane and followed by ultraviolet irradiation. The surface water contact angle was improved from 46° of original ceramic membrane to 159°, which exhibited a stable and excellent superhydrophobic effect. The modified membranes showed a high flux of 27.28 kg·m^-2·h^-1 and simultaneously maintained an excellent retention rate of 99.99%, when used in vacuum membrane distillation process for treatment of a 1 wt% NaCl (75℃) aqueous solution. These results suggested that superhydrophobic modification of ceramic surface is a facile and cost-effective way to achieve higher membrane distillation performance. The superhydrophobically-modified ceramic membrane with an excellent desalination capacity would show considerable potential in practical membrane distillation utilizations.

Key words: Superhydrophobic modification, Fluoroalkylsilane, Ultraviolet irradiation, Ceramic membrane, Vacuum membrane distillation

Yanhui Yang, Qianqian Liu, Haizhi Wang, Fusheng Ding, Guoshan Jin, Chunxi Li, Hong Meng. Superhydrophobic modification of ceramic membranes for vacuum membrane distillation[J]. , 2017, 25(10): 1395-1401.

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Superhydrophobic modification of ceramic membranes for vacuum membrane distillation

Superhydrophobic modification of ceramic membranes for vacuum membrane distillation

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