期刊
NANO LETTERS
卷 17, 期 2, 页码 728-732出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b03837
关键词
Graphene oxide membranes; ionic permeability; surface charges; ion exchange; ionic sieving
类别
资金
- National Research Foundation, Prime Minister's Office, Singapore, under the NRF Fellowship Program [NRF-NRFF2012-09]
- National Research Foundation, Prime Minister's Office, Singapore, under the Competitive Research Program [NRF-CRP13-2014-03]
- Brazilian agency FAPESP [2013/21190-2]
Nanostructured graphene-oxide (GO) laminate membranes, exhibiting ultrahigh water flux, are excellent candidates for next generation nanofiltration and desalination membranes, provided the ionic rejection could be further increased without compromising the water flux. Using microscopic drift diffusion experiments, we demonstrated the ultrahigh charge selectivity for GO membranes, with more than order of magnitude difference in the permeabilities of cationic and anionic species of equivalent hydration radii. Measuring diffusion of a wide range of ions of different size and charge, we were able to clearly disentangle different physical mechanisms contributing to the ionic sieving in GO membranes: electrostatic repulsion between ions and charged chemical groups; and the compression of the ionic hydration shell within the membrane's nanochannels, following the activated behavior. The charge-selectivity allows us to rationally design membranes with increased ionic rejection and opens up the field of ion exchange and electrodialysis to the GO membranes.
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