Cation-diffusion controlled formation of thin graphene oxide composite membranes for efficient ethanol dehydration

作     者：Kecheng Guan Quan Liu Guanyu Zhou Guozhen Liu Yufan Ji Gongping Liu Wanqin Jin 管科成;刘泉;周冠宇;刘国振;季雨凡;刘公平;金万勤

作者机构：State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2019年第62卷第7期

页      面：925-935页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：financially supported by the National Natural Science Foundation of China (21476107, 21490585, 21776125 and 51861135203) the Innovative Research Team Program by the Ministry of Education of China (IRT17R54) the Topnotch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP) 

主　　题：graphene oxides cation diffusion composite membranes pervaporation 

摘      要：Structural manipulation of graphene oxide (GO) building blocks has been widely researched. Concerning GO membranes for separation applications, the validity and maintenance of their microscopic structures in the chemical environment are pivotal for effective separation at the molecular scale. Cationic interactions with both aromatic rings and oxygenated functional groups of GO make metal ions intriguing for physically and chemically structural reinforcement. By filtrating GO suspension through the substrate loaded with cations, stacking o f GO nanosheets and diffusion of cations steadily evolve simultaneously in an aqueous environment without flocculation. Thus, thin and homogeneous GO membrane is obtained. Divalent and monovalent cations were studied regarding their interactions with GO, and the performance of correspondingly functionalized membranes was evaluated. The divalent cation-stabilized membranes have favorable stability in the separation of water/ethanol. This facile fabrication and functionalization method may also be applicable for structure construction of other two-dimensional materials.