Cations Block Hydrogen-Bonding-Driven Ethanol Permeation through Disordered Drop-Cast Graphene Oxide Membranes

被引：9

作者：

Church, Richard B. ^{[1
]}

Hu, Kaiwen ^{[1
]}

Magnacca, Giuliana ^{[2
,3
]}

Cerruti, Marta ^{[1
]}

机构：

[1] McGill Univ, Dept Min & Mat Engn, Montreal, PQ H3A 0E8, Canada

[2] Univ Turin, Dept Chem, I-10125 Turin, Italy

[3] Univ Turin, NIS Interdept Ctr, I-10125 Turin, Italy

来源：

ACS APPLIED NANO MATERIALS | 2019年 / 2卷 / 09期

基金：

加拿大自然科学与工程研究理事会;

关键词：

graphene oxide membranes; molecular separation; intercalated species; in situ characterization; ethanol dehydration; INFRARED-SPECTRA; WATER; DEHYDRATION; SEPARATION; PRECISE; ORIGIN; IONS;

D O I：

10.1021/acsanm.9b00873

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Graphene oxide (GO) membranes are an ideal candidate for ethanol (EtOH) dehydration. EtOH rejection is typically obtained by controlling the GO's structural order, sometimes in combination with large concentrations of ions, but the mechanisms responsible for EtOH rejection are poorly understood. Here we show that GO membranes drop-cast from suspensions containing a small concentration of ions are impermeable to EtOH vapor. Backed by in situ experimental evidence, acid-base titrations and calculations based on percolation theory matching the results obtained at different ionic concentrations, we propose that the ions prevent hydrogen-bonding-driven intercalation by screening the GO's oxygen-containing groups, a more effective mechanism than the one previously based on in silico simulations.

引用

页码：5389 / 5398

页数：19

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