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Shielding effect enables fast ion transfer through nanoporous membrane for highly energy-efficient electrodialysis

journal contribution
posted on 2024-01-30, 04:49 authored by Jiuyang Lin, Wenyuan Ye, Shuangling Xie, Jiale Du, Riri Liu, Dong Zou, Xiangyu Chen, Zijian Yu, Shengqiong Fang, Elisa Yun Mei Ang, William Toh, Dan Dan Han, Teng Yong Ng, Dong Han Seo, Shuaifei ZhaoShuaifei Zhao, Bart Van der Bruggen, Ming Xie, Young Moo Lee
AbstractA key to sustainable management of saline organic-rich wastewaters is to precisely fractionate organic components and inorganic salts (NaCl) as individual resources. Conventional nanofiltration and electrodialysis processes suffer from membrane fouling and compromise the fractionation efficacy. Here we develop a thin-film composite nanoporous membrane via co-deposition of dopamine and polyethyleneimine as a highly anion-conducting membrane. Experimental results and molecular dynamics simulations show that co-deposition of dopamine and polyethyleneimine effectively tailors the membrane surface properties, intensifying the charge shielding effect and enabling fast anion transfer for highly efficient electrodialysis. The resulting nanoporous membrane exhibits unprecedented electrodialytic fractionation of organics and NaCl with negligible membrane fouling, dramatically outperforming state-of-the-art anion exchange membranes. Our study sheds light on facile design of high-performance anion-conducting membranes and associated new mass transport mechanisms in electrodialytic separation, paving the way for sustainable management of complex waste streams.

History

Journal

Nature Water

Volume

1

Pagination

725-735

Location

Berlin, Germany

ISSN

2731-6084

eISSN

2731-6084

Language

en

Issue

8

Publisher

Springer Science and Business Media LLC

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