Journal
DESALINATION
Volume 480, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.desal.2020.114328
Keywords
Molybdenum disulfide; Graphene oxide membrane; Water-stability; Water treatment
Categories
Funding
- National Natural Science Foundation of China [51774245]
- Applied Basic Research Program of Science and Technology Department of Sichuan Province [2018JY0517]
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation [PLN161]
- Research Center of Energy Polymer Materials (Southwest Petroleum University)
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Robust stable filtration membranes based on graphene oxide (GO), with fast and efficient capacity to separate dyes or salts from water, are highly necessary to maintain fresh water resources, but still a challenge to achieve. Herein, an easy and effective route has been demonstrated to address this challenge by intercalating GO with molybdenum disulfide (MoS2) nanosheets. Prompted by the strong van der Waals interactions between GO and MoS2 and the weak interaction between MoS2 and H2O molecules, the interlayer stabilizing force within the MoS2/GO filtration membrane has been greatly enhanced. Therefore, robust stability against harsh conditions (pH values from 3 to 11) without any additional cross-linkers can be realized. Additionally, compared with pure GO membrane, our MoS2/GO membrane exhibits both enhanced pure water flux (from 8.83 L.m(-2).h(-1) to 48.27 L.m(-2).h(-1)) and improved salts removal capacity (i.e., K3Fe(CN)(6) (from 54.32% to 96.85%)), without deteriorating its dyes rejection ratio (i.e., methylene blue (more than 99.50%)). Meanwhile, the membrane also has outstanding cycling stability. For the ubiquitous van der Waals forces between two-dimensional materials, our method can be easily extended to construct other stable and highly efficient filtration membranes.
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