Poly(vinyl alcohol)/Carboxyl Graphene Membranes for Ethanol Dehydration by Pervaporation. Issue 3 (23rd January 2020)

• Record Type: Journal Article
• Authors: Han, Guanglu; Chen, Zhe; Cai, Lifang; Zhang, Yonghui; Tian, Junfeng; Ma, Huanhuan; Fang, Shaoming
• Is Part Of: Chemical engineering & technology. Volume 43:Issue 3(2020)
• Page Start: 574
• Page End: 581
• Publication Date: 2020-01-23
• Subjects: Carboxyl graphene -- Ethanol dehydration -- Mixed‐matrix membrane -- Pervaporation -- Poly(vinyl alcohol); Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.201900149
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: 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. Abstract : Carboxyl graphene with crosslinking and hybridization functions was incorporated into poly(vinyl alcohol) to form novel high‐performance water‐selective mixed‐matrix membranes. The hydrophilicity and crossliking structure of the membranes led to moderate swelling. The membrane crystallinity and the free volume could be tuned effectively, thus promoting long‐term stability and enhanced separation.