Enhanced desalination performance of carboxyl functionalized graphene oxide nanofiltration membranes

被引：172

作者：

Yuan, Yiqing ^{[1
,2
]}

Gao, Xueli ^{[1
,2
]}

Wei, Yi ^{[1
,2
]}

Wang, Xinyan ^{[4
]}

Wang, Jian ^{[3
]}

Zhang, Yushan ^{[3
]}

Gao, Congjie ^{[2
]}

机构：

[1] Ocean Univ China, Minist Educ, Key Lab Marine Chem Theory & Technol, Qingdao 266100, Shandong, Peoples R China

[2] Ocean Univ China, Coll Chem & Chem Engn, Qingdao 266100, Peoples R China

[3] SOA, Inst Tianjin Seawater Desalinat & Multipurpose Ut, Tianjin 300192, Peoples R China

[4] Shandong Zhaojin Motian Co Ltd, Zhaoyuan 265400, Shandong, Peoples R China

来源：

DESALINATION | 2017年 / 405卷

关键词：

Carboxyl-functionalized grapheme oxide; Pressure-assisted self-assembly; Nanofiltration; Desalination; NANOCOMPOSITE MEMBRANES; COMPOSITE MEMBRANES; GRAPHITE OXIDE; WATER; FABRICATION; SEPARATION; TRANSPORT; NANOSHEETS; REMOVAL; CHARGE;

D O I：

10.1016/j.desal.2016.11.024

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The desalting performance of graphene oxide (GO) membranes was further optimized using one-step carboxylation via nucleophilic substitution reactions between epoxy groups of graphene oxide (GO) and amino groups of glycine. GO and GO-COOH membranes with highly ordered structure were preparedby pressure-assisted self-assembly technique. The performance of GO and GO-COOH membranes was investigated and compared. The results showed that GO-COOH membranes exhibited not only higher permeability but also better salt rejections compared with pristine GO membranes. The surface physicochemical properties of GO-COOH membrane including negativity and hydrophilicity were improved as well. The transport mechanism revealed that the improvement of desalting properties was attributed to enhanced electrostatic repulsion by inducing effective negative charge. The higher permeability of GO-COOH membranes resulted from increased water nanochannels and improved surface hydrophilicity. Overall, GO-COOH membranes show great potential in the separation field due to prominent permeation performance and desirable separation property. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：29 / 39

页数：11

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