期刊
NANO LETTERS
卷 17, 期 5, 页码 2928-2933出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00148
关键词
Graphene oxide; membrane; self-assembly; interlayer nanostructure; water purification
类别
资金
- National Science Foundation (NSF) [1451887]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1451887] Funding Source: National Science Foundation
Single-layer graphene oxide (SLGO) is emerging as a new-generation membrane material for high-flux, high-selectivity water purification, owing to its favorable two-dimensional morphology that allows facile fabrication of ultrathin membranes with subnanometer interlayer channels. However, reliable and precise molecular sieving performance still necessarily depends on thick graphene oxide (GO) deposition that usually leads to low water flux. This trade-off between selectivity and flux significantly impedes the development of ultrathin GO membranes. In this work, we demonstrate that the selectivity/flux trade-off can be broken by self-assembly of SLGO via simple deposition rate control. We find GO membranes, prepared by slow deposition of SLGO flakes, exhibit considerably improved salt rejection, while counterintuitively having 2.5-4 times higher water flux than that-Of membranes prepared by fast deposition. This finding has extensive implications of deigning/tuning interlayer nanostructure of ultrathin GO membranes by simply controlling SLGO deposition rate and thus may greatly facilitate their development for high flux, high selectivity water purification.
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