Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 595, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2019.117586
Keywords
Graphene oxide; Nanofiltration; Cation-GO interaction; Contra-diffusion; Salt rejection
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Funding
- National Natural Science Foundation of China [21534009]
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Membranes based on graphene or graphene oxide (GO) have received intensive studies recently for various separation processes. However, a great challenge lies in fast and facile fabrication of GO membranes with high salt rejection. Here we report for the first time that ultra-thin GO films with a good salt rejection can be fabricated via contra-diffusion-induced crosslinking based on cation-pi and electrostatic interactions between cations and GO flakes. It only takes down to 5 min to construct a defect-free GO film. Various cations, including Na+, K+, Mg2+, Ca2+ and Fe3+, can be used as crosslinkers to endow the as-prepared GO membranes with highly tunable separation performance. The optimized GO membranes exhibit over 90% rejection of Na2SO4 with filtrate permeance of 4.3 L m-2 h(-1) bar(-1) during the nanofiltration process, which reaches to the performance upper limit of previously reported graphene-based membranes. Such a high performance should be attributed to the unique packing structures of the GO flakes crosslinked by cations and the thin and uniform GO selective layers.
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