期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 24, 页码 13275-13283出版社
AMER CHEMICAL SOC
DOI: 10.1021/am404268z
关键词
gelatin/tannic acid; layer-by-layer self-assembly; hydrophobic interaction; hydrogen bond; ultrathin membranes
资金
- National Science Fund for Distinguished Young Scholars [21125627]
- National Natural Science Fundation of China [21306131]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120032120009]
- Seed Foundation of Tianjin University
- Program of Introducing Talents of Discipline to Universities [B06006]
A novel and facile layer-by-layer (LbL) self-assembly process driven by hydrophobic interaction and then reinforced by hydrogen bond was developed to prepare ultrathin membranes. Gelatin (GE) and tannic acid (TA) were alternately deposited on polyacrylonitrile (PAN) ultrafiltration. membranes to obtain GE/TA membranes. The required number of deposition cycles for acceptable permselectivity of membrane was greatly reduced compared with that of the traditional LbL self-assembly process and could be ascribed to the rapid growth of membrane thickness and the integrity of the innermost gelatin layer. Higher surface hydrophilicity and more appropriate free volume characteristics were obtained for GE/TA multilayer membranes compared with pristine gelatin membrane. Moreover, the GE/TA multilayer membrane exhibited improved stability even at high water content of 30 wt %. The membrane separation experiments with pervaporation dehydration of ethanol aqueous solution as a model system demonstrated the GE/TA multilayer membrane achieved higher water permselectivity than the pristine gelatin membrane. High operation stability was acquired in the long-term membrane separation test.
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