High permeability sub-nanometre sieve composite MoS2 membranes

Two-dimensional membranes have gained enormous interest due to their potential to deliver precision filtration of species with performance that can challenge current desalination membrane platforms. Molybdenum disulfide (MoS 2 ) laminar membranes have recently demonstrated superior stability in aque...

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Bibliographic Details
Published in:Nature communications 2020-06, Vol.11 (1), p.2747-2747, Article 2747
Main Authors: Sapkota, Bedanga, Liang, Wentao, VahidMohammadi, Armin, Karnik, Rohit, Noy, Aleksandr, Wanunu, Meni
Format: Article
Language:English
Subjects:
639/301/357/1018
639/925/350/1058
Aqueous environments
Desalination
Dyes
ENGINEERING
Filtration
Graphene
Humanities and Social Sciences
Interlayers
MATERIALS SCIENCE
Membrane permeability
Membranes
Molybdenum
Molybdenum disulfide
multidisciplinary
Multilayers
Nanopores
NANOSCIENCE AND NANOTECHNOLOGY
Pore size
Porosity
Reverse osmosis
Salts
Science
Science (multidisciplinary)
Stability
Surface charge
Two dimensional composites
Two-dimensional materials
Water purification
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Summary:Two-dimensional membranes have gained enormous interest due to their potential to deliver precision filtration of species with performance that can challenge current desalination membrane platforms. Molybdenum disulfide (MoS 2 ) laminar membranes have recently demonstrated superior stability in aqueous environment to their extensively-studied analogs graphene-based membranes; however, challenges such as low ion rejection for high salinity water, low water flux, and low stability over time delay their potential adoption as a viable technology. Here, we report composite laminate multilayer MoS 2 membranes with stacked heterodimensional one- to two-layer-thick porous nanosheets and nanodisks. These membranes have a multimodal porous network structure with tunable surface charge, pore size, and interlayer spacing. In forward osmosis, our membranes reject more than 99% of salts at high salinities and, in reverse osmosis, small-molecule organic dyes and salts are efficiently filtered. Finally, our membranes stably operate for over a month, implying their potential for use in commercial water purification applications. Molybdenum disulfide membranes are attractive for filtration of nanoscale species but should be optimized for application. Here, the authors report composite membranes with tunable surface charge, pore size and interlayer spacing, achieving efficient filtration of small-molecule dyes and osmosis.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-16577-y