Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 48, Pages 58076-58084Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c14967
Keywords
two-dimensional membrane; WS2; TiO2; self-cleaning; water filtration
Funding
- Natural Science Foundation of Shanghai [18ZR1427800]
- National Natural Science Foundation of China [22005191, 21676291]
- 111 Innovation and Talent Recruitment Base on Photochemical and Energy Materials [D18020]
- Shanghai Engineering Research Center of Green Energy Chemical Engineering [18DZ2254200]
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A strategy utilizing nanoparticle bridges based on amorphous TiO2 is developed to link adjacent WS2 nanosheets on a WS2 membrane surface, resulting in a strong membrane with excellent stability. Additionally, the amorphous TiO2 bridges form a TiO2/WS2 heterojunction on the membrane surface, showcasing impressive self-cleaning performance through photocatalysis-driven pollutant degradation.
Two-dimensional (2D) membranes as a new type of water filtration membrane have shown great potential in water separation and purification. However, their long-term stability under cross-flow conditions and their antifouling property are two main concerns for practical separation and purification processes. In this work, a strategy of nanoparticle bridges based on amorphous TiO2 is developed to link adjacent WS2 nanosheets on a WS, membrane surface, leading to a strong membrane surface with excellent stability during 204 h of continuous cross-flow filtration. Moreover, the amorphous TiO2 bridges also form a TiO2/WS2 heterojunction on the WS2 membrane surface, exhibiting an impressive photocatalysis-driving self-cleaning property by pollutant photodegradation. And the flux recovery ratio (FRR) exceeds 95% after three cycles of separation experiments. The excellent long-term stability and photocatalysis-driving self-cleaning property of the WS2/TiO2 membrane provide a new approach to construct robust 2D membranes.
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