Hong, Seunghyun; Constans, Charlotte; Martins, Marcos Vinicius Surmani; Seow, Yong Chin; Carrio, Juan Alfredo Guevara; Garaj, Slaven Scalable Graphene-Based Membranes for Ionic Sieving with Ultrahigh Charge Selectivity Journal Article 186 NANO LETTERS, 17 (2), pp. 728-732, 2017, ISSN: 1530-6984. Abstract | Links | BibTeX @article{ISI:000393848800019,
title = {Scalable Graphene-Based Membranes for Ionic Sieving with Ultrahigh Charge Selectivity},
author = {Seunghyun Hong and Charlotte Constans and Marcos Vinicius Surmani Martins and Yong Chin Seow and Juan Alfredo Guevara Carrio and Slaven Garaj},
doi = {10.1021/acs.nanolett.6b03837},
times_cited = {186},
issn = {1530-6984},
year = {2017},
date = {2017-02-01},
journal = {NANO LETTERS},
volume = {17},
number = {2},
pages = {728-732},
publisher = {AMER CHEMICAL SOC},
address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA},
abstract = {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.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
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. |
