Poly(vinyl alcohol)/Carboxyl Graphene Membranes for Ethanol Dehydration by Pervaporation
Poly(vinyl alcohol)/Carboxyl Graphene Membranes for Ethanol Dehydration by Pervaporation
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用于乙醇渗透蒸发脱水的聚乙烯醇/羧基石墨烯膜
DOI：
10.1002/ceat.201900149
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发表时间：
2020-01-23
影响因子：
2.1
通讯作者：
Fang, Shaoming
中科院分区：
文献类型：
--
作者：
Han, Guanglu;Chen, Zhe;Fang, Shaoming
将具有杂化和交联双重功能的羧基石墨烯(CG)引入聚乙烯醇(PVA)中，形成PVA/CG混合基质膜(MMM)。该膜具有优异的力学性能和热稳定性。亲水性的提高和形成的交联结构导致了适度的溶胀。随着CG负载量的增加，膜的结晶度降低，自由体积增大。乙醇脱水的渗透汽化(PV)分离性能表明，在最佳的CG负载量下，渗透通量和分离因子同时得到提高。随后，在较高的CG负荷下，渗透通量继续增加，而分离因子下降。
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.