SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2014, Vol. 22 ›› Issue (1): 19-27.DOI: 10.1016/S1004-9541(14)60015-X

Previous Articles     Next Articles

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

WU Hong1,2,3, LU Xia1, LI Xianshi1, LI Yifan1, ZHAO Cuihong1, JIANG Zhongyi1,2   

  1. 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:2014-01-04 Published:2014-01-05
  • 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).

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. 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
  • 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).

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

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