期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 62, 期 23, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202302931
关键词
Graphene; Membranes; Positively Charged Surface; Posterior Interfacial Polymerization; Water Treatment
A new posterior interfacial polymerization (p-IP) strategy is reported, in which a tailor-made polyamide (PA) network is constructed in situ in a two-dimensional graphene oxide (GO) membrane to enhance size exclusion and repel metal ions. This strategy addresses global water scarcity by achieving superior metal ion rejection and high permeance.
Two-dimensional graphene oxide (GO) membranes are gaining popularity as a promising means to address global water scarcity. However, current GO membranes fail to sufficiently exclude angstrom-sized ions from solution. Herein, a de novo posterior interfacial polymerization (p-IP) strategy is reported to construct a tailor-made polyamide (PA) network in situ in an ultrathin GO membrane to strengthen size exclusion while imparting a positively charged membrane surface to repel metal ions. The electrostatic repulsion toward metal ions, coupled with the reinforced size exclusion, synergistically drives the high-efficiency metal ion separation through the synthesized positively charged GO framework (PC-GOF) membrane. This dual-mechanism-driven PC-GOF membrane exhibits superior metal ion rejection, anti-fouling ability, good operational stability, and ultra-high permeance (five times that of pristine GO membranes), enabling a sound step towards a sustainable water-energy-food nexus.
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