Bioinspired Graphene Oxide Membranes with pH-Responsive Nanochannels for High-Performance Nanofiltration

被引：161

作者：

Zhang, Zhijie ^{[1
]}

Xiao, Xiao ^{[2
]}

Zhou, Yihao ^{[2
]}

Huang, Linjun ^{[1
]}

Wang, Yanxin ^{[1
]}

Rong, Qinglin ^{[1
]}

Han, Zhenyang ^{[1
]}

Qu, Huaijiao ^{[1
]}

Zhu, Zhijun ^{[1
]}

Xu, Shumao ^{[2
]}

Tang, Jianguo ^{[1
]}

Chen, Jun ^{[2
]}

机构：

[1] Qingdao Univ, Coll Mat Sci & Engn, Natl Ctr Int Res Hybrid Mat Technol, Inst Hybrid Mat,Natl Base Int Sci & Technol Coope, Qingdao 266071, Peoples R China

[2] Univ Calif Los Angeles, Dept Bioengn, Los Angeles, CA 90095 USA

来源：

ACS NANO | 2021年 / 15卷 / 08期

关键词：

graphene oxide membrane; pH-responsive; gating regularity; nanofiltration; molecular separation; WATER PERMEATION; HIGH-FLUX; SEPARATION; STABILITY; COMPOSITE; CHEMISTRY;

D O I：

10.1021/acsnano.1c02719

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Tunable gating graphene oxide (GO) membranes with high water permeance and precise molecular separation remain highly desired in smart nanofiltration devices. Herein, bioinspired by the filtration function of the renal glomerulus, we report a smart and high-performance graphene oxide membrane constructed via introducing positively charged polyethylenimine-grafted GO (GO-PEI) to negatively charged GO nanosheets. It was found that the additional GO-PEI component changed the surface charge, improved the hydrophilicity, and enlarged the nanochannels. The glomerulus-inspired graphene oxide membrane (G-GOM) shows a water permeance up to 88.57 L m(-2) h(-1) bar(-1), corresponding to a 4 times enhancement compared with that of a conventional GO membrane due to the enlarged confined nanochannels. Meanwhile, owing to the electrostatic interaction, it can selectively remove positively charged methylene blue at pH 12 and negatively charged methyl orange at pH 2, with a removal rate of over 96%. The high and cyclic water permeance and highly selective organic removal performance can be attributed to the synergic effect of controlled nanochannel size and tunable electrostatic interaction in responding to the environmental pH. This strategy provides insight into designing pH-responsive gating membranes with tunable selectivity, representing a great advancement in smart nanofiltration with a wide range of applications.

引用

页码：13178 / 13187

页数：10

共 51 条

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