Integral PVA-PES Composite Membranes by Surface Segregation Method for Pervaporation Dehydration of Ethanol

›› 2011, Vol. 19 ›› Issue (5): 855-862.

Integral PVA-PES Composite Membranes by Surface Segregation Method for Pervaporation Dehydration of Ethanol

吴洪^1,2, 李宪实¹, 聂明成¹, 李犇¹, 姜忠义¹

1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China

收稿日期:2011-06-10 修回日期:2011-08-25 出版日期:2011-10-28 发布日期:2011-10-28
通讯作者: JIANG Zhongyi,E-mail:zhyjiang@tju.edu.cn
基金资助:
Supported by the State Key Development Program for Basic Research of China (2009CB623404);Program for New Century Excellent Talents in University,the Programme of Introducing Talents of Discipline to Universities (B06006);State KeyLaboratory for Modification of Chemical Fibers and Polymer Materials (Dong Hua University)

Integral PVA-PES Composite Membranes by Surface Segregation Method for Pervaporation Dehydration of Ethanol

WU Hong^1,2, LI Xianshi¹, NIE Mingcheng¹, LI Ben¹, JIANG Zhongyi¹

1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China

Received:2011-06-10 Revised:2011-08-25 Online:2011-10-28 Published:2011-10-28
Supported by:
Supported by the State Key Development Program for Basic Research of China (2009CB623404);Program for New Century Excellent Talents in University,the Programme of Introducing Talents of Discipline to Universities (B06006);State KeyLaboratory for Modification of Chemical Fibers and Polymer Materials (Dong Hua University)

摘要/Abstract

摘要： A facile surface segregation method was utilized to fabricate poly(vinyl alcohol)-polyethersulfone (PVA-PES) composite membranes. PVA and PES were first dissolved in dimethyl sulfoxide (DMSO), then casted on a glass plate and immersed in a coagulation bath. During the phase inversion process in coagulation bath, PVA spontaneously segregated to the polymer solution/coagulation bath interface. The enriched PVA on the surface was further crosslinked by glutaraldehyde. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS) confirmed the integral and asymmetric membrane structure with a dense PVA-enriched surface and a porous PES-enriched support, as well as the surface enrichment of PVA. The coverage fraction of the membrane surface by PVA reached up to 86.8% when the PVA content in the membrane recipe was 16.7% (by mass). The water contact angle decreased with the increase of PVA content. The effect of coagulation bath type on membrane structure was analyzed. The membrane pervaporation performance was evaluated by varying the PVA content, the annealing temperature, feed concentration and operation temperature. The membrane exhibited a fairly good ethanol dehydration capacity and long-term operational stability.

关键词: surface segregation, phase inversion, PVA-PES composite membrane, pervaporation, ethanol

Abstract: A facile surface segregation method was utilized to fabricate poly(vinyl alcohol)-polyethersulfone (PVA-PES) composite membranes. PVA and PES were first dissolved in dimethyl sulfoxide (DMSO), then casted on a glass plate and immersed in a coagulation bath. During the phase inversion process in coagulation bath, PVA spontaneously segregated to the polymer solution/coagulation bath interface. The enriched PVA on the surface was further crosslinked by glutaraldehyde. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS) confirmed the integral and asymmetric membrane structure with a dense PVA-enriched surface and a porous PES-enriched support, as well as the surface enrichment of PVA. The coverage fraction of the membrane surface by PVA reached up to 86.8% when the PVA content in the membrane recipe was 16.7% (by mass). The water contact angle decreased with the increase of PVA content. The effect of coagulation bath type on membrane structure was analyzed. The membrane pervaporation performance was evaluated by varying the PVA content, the annealing temperature, feed concentration and operation temperature. The membrane exhibited a fairly good ethanol dehydration capacity and long-term operational stability.

Key words: surface segregation, phase inversion, PVA-PES composite membrane, pervaporation, ethanol

吴洪, 李宪实, 聂明成, 李犇, 姜忠义. Integral PVA-PES Composite Membranes by Surface Segregation Method for Pervaporation Dehydration of Ethanol[J]. , 2011, 19(5): 855-862.

WU Hong, LI Xianshi, NIE Mingcheng, LI Ben, JIANG Zhongyi. Integral PVA-PES Composite Membranes by Surface Segregation Method for Pervaporation Dehydration of Ethanol[J]. , 2011, 19(5): 855-862.

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Integral PVA-PES Composite Membranes by Surface Segregation Method for Pervaporation Dehydration of Ethanol

Integral PVA-PES Composite Membranes by Surface Segregation Method for Pervaporation Dehydration of Ethanol

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