Enhancing Structural Stability and Pervaporation Performance of Composite Membranes by Coating Gelatin onto Hydrophilically Modified Support Layer

doi:10.1016/S1004-9541(14)60015-X

Chinese Journal of Chemical Engineering ›› 2014, Vol. 22 ›› Issue (1): 19-27.DOI: 10.1016/S1004-9541(14)60015-X

Enhancing Structural Stability and Pervaporation Performance of Composite Membranes by Coating Gelatin onto Hydrophilically Modified Support Layer

吴洪^1,2,3, 芦霞¹, 李宪实¹, 李奕帆¹, 赵翠红¹, 姜忠义^1,2

1 Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Synergetic Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China;
3 Tianjin Key Laboratory of Membrane Science & Desalination Technology, Tianjin 300072, China

收稿日期:2013-09-01 修回日期:2013-10-31 出版日期:2014-01-05 发布日期:2014-01-04
通讯作者: JIANG Zhongyi
基金资助:
Supported by the New Century Excellent Talents in University (NCET-10-0623), National Natural Science Foundation for Distinguished Young Scholars (21125627), National Basic Research Program of China (2009CB623404), and State Key Laboratory for Modification of Chemical Fibers and Polymer Materials (Dong Hua University).

Enhancing Structural Stability and Pervaporation Performance of Composite Membranes by Coating Gelatin onto Hydrophilically Modified Support Layer

WU Hong^1,2,3, LU Xia¹, LI Xianshi¹, LI Yifan¹, ZHAO Cuihong¹, JIANG Zhongyi^1,2

1 Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Synergetic Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China;
3 Tianjin Key Laboratory of Membrane Science & Desalination Technology, Tianjin 300072, China

Received:2013-09-01 Revised:2013-10-31 Online:2014-01-05 Published:2014-01-04
Contact: JIANG Zhongyi
Supported by:
Supported by the New Century Excellent Talents in University (NCET-10-0623), National Natural Science Foundation for Distinguished Young Scholars (21125627), National Basic Research Program of China (2009CB623404), and State Key Laboratory for Modification of Chemical Fibers and Polymer Materials (Dong Hua University).

摘要/Abstract

摘要： The interfacial compatibility of composite membrane is an important factor to its structural stability and separation performance. In this study, poly (ether sulfone) (PES) support layer was first hydrophilically modified with poly(vinyl alcohol) (PVA) via surface segregation during the phase inversion process. Gelatin (GE) was then cast on the PVA-modified PES support layer as the active layer followed by crosslinking to fabricate composite membranes for ethanol dehydration. The enrichment of PVA on the surface of support layer improved interfacial compatibility of the as-prepared GE/PVA-PES composite membrane. The water contact angle measurement and X-ray photoelectron spectroscopy (XPS) data confirmed the surface segregation of PVA with a surface coverage density of ~80%. T-peel test showed that the maximal force to separate the support layer and the active layer was enhanced by 3 times compared with the GE/PES membrane. The effects of PVA content in the support layer, crosslinking of GE active layer and operating parameters on the pervaporative dehydration performance were investigated. The operational stability of the composite membrane was tested by immersing the membrane in ethanol aqueous solution for a period of time. Stable pervaporation performance for dehydration of 90% ethanol solution was obtained for GE/PVA-PES membrane with a separation factor of ~60 and a permeation flux of ~1910 g·m^-2·h^-1 without peeling over 28 days immersion.

关键词: surface segregation, composite membrane, interfacial stability, pervaporation, ethanol dehydration

Abstract: The interfacial compatibility of composite membrane is an important factor to its structural stability and separation performance. In this study, poly (ether sulfone) (PES) support layer was first hydrophilically modified with poly(vinyl alcohol) (PVA) via surface segregation during the phase inversion process. Gelatin (GE) was then cast on the PVA-modified PES support layer as the active layer followed by crosslinking to fabricate composite membranes for ethanol dehydration. The enrichment of PVA on the surface of support layer improved interfacial compatibility of the as-prepared GE/PVA-PES composite membrane. The water contact angle measurement and X-ray photoelectron spectroscopy (XPS) data confirmed the surface segregation of PVA with a surface coverage density of ~80%. T-peel test showed that the maximal force to separate the support layer and the active layer was enhanced by 3 times compared with the GE/PES membrane. The effects of PVA content in the support layer, crosslinking of GE active layer and operating parameters on the pervaporative dehydration performance were investigated. The operational stability of the composite membrane was tested by immersing the membrane in ethanol aqueous solution for a period of time. Stable pervaporation performance for dehydration of 90% ethanol solution was obtained for GE/PVA-PES membrane with a separation factor of ~60 and a permeation flux of ~1910 g·m^-2·h^-1 without peeling over 28 days immersion.

Key words: surface segregation, composite membrane, interfacial stability, pervaporation, ethanol dehydration

吴洪, 芦霞, 李宪实, 李奕帆, 赵翠红, 姜忠义. Enhancing Structural Stability and Pervaporation Performance of Composite Membranes by Coating Gelatin onto Hydrophilically Modified Support Layer[J]. Chinese Journal of Chemical Engineering, 2014, 22(1): 19-27.

WU Hong, LU Xia, LI Xianshi, LI Yifan, ZHAO Cuihong, JIANG Zhongyi. Enhancing Structural Stability and Pervaporation Performance of Composite Membranes by Coating Gelatin onto Hydrophilically Modified Support Layer[J]. Chin.J.Chem.Eng., 2014, 22(1): 19-27.

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Enhancing Structural Stability and Pervaporation Performance of Composite Membranes by Coating Gelatin onto Hydrophilically Modified Support Layer

Enhancing Structural Stability and Pervaporation Performance of Composite Membranes by Coating Gelatin onto Hydrophilically Modified Support Layer

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