Desalination and Nanofiltration through Functionalized Laminar MoS2 Membranes

Hirunpinyopas, Wisit, Prestat, Eric, Worrall, Stephen D, Haigh, Sarah, Dryfe, |R and Bissett, Mark (2017). Desalination and Nanofiltration through Functionalized Laminar MoS2 Membranes. ACS Nano, 11 (11), pp. 11082-11090.

Abstract

Laminar membranes of two-dimensional materials are excellent candidates for applications in water filtration due to the formation of nanocapillaries between individual crystals that can exhibit a molecular and ionic sieving effect, while allowing high water flux. This approach has been exemplified previously with graphene oxide, however these membranes suffer from swelling when exposed to liquid water, leading to low salt rejection and reducing their applicability for desalination applications. Here, we demonstrate that by producing thin (~5 µm) laminar membranes of exfoliated molybdenum disulfide (MoS2) in a straightforward and scalable process, followed by a simple chemical functionalization step, we can efficiently reject (~99%) of the ions commonly found in sea water, while maintaining water fluxes significantly higher (~5 times) than those reported for graphene oxide membranes. These functionalized MoS2 membranes exhibit excellent long-term stability with no swelling, and consequent decrease in ion rejection, when immersed in water for periods exceeding 6 months. Similar stability is observed when exposed to organic solvents, indicating that they are ideal for a variety of technologically important filtration applications.

Publication DOI: https://doi.org/10.1021/acsnano.7b05124
Divisions: Engineering & Applied Sciences > Chemical Engineering & Applied Chemistry
Engineering & Applied Sciences
Additional Information: This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited
Full Text Link:
Related URLs: https://pubs.ac ... acsnano.7b05124 (Publisher URL)
Published Date: 2017-11-28
Authors: Hirunpinyopas, Wisit
Prestat, Eric
Worrall, Stephen D ( 0000-0003-1969-3671)
Haigh, Sarah
Dryfe, |R
Bissett, Mark

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