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Poly(vinyl alcohol)/Carboxyl Graphene Membranes for Ethanol Dehydration by Pervaporation
Author(s) -
Han Guanglu,
Chen Zhe,
Cai Lifang,
Zhang Yonghui,
Tian Junfeng,
Ma Huanhuan,
Fang Shaoming
Publication year - 2020
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201900149
Subject(s) - pervaporation , membrane , vinyl alcohol , permeation , crystallinity , chemical engineering , dehydration , thermal stability , materials science , swelling , ethanol , graphene , polymer chemistry , chemistry , organic chemistry , polymer , composite material , engineering , biochemistry
Carboxyl graphene (CG) with two functions of hybridization and crosslinking was incorporated into poly(vinyl alcohol) (PVA) matrix to form PVA/CG mixed‐matrix membranes (MMMs). The membranes demonstrated excellent mechanical properties and thermal stability. The improved hydrophilicity and formed crosslinking structure led to moderate swelling. The membrane crystallinity decreased and the free volume was promoted with increasing CG loading amount. The pervaporation (PV) separation performance for ethanol dehydration indicated that both permeation flux and separation factor were enhanced simultaneously at the optimum CG loading. Subsequently, the permeation flux continued to increase while the separation factor declined at higher CG loadings.