Fabrication of mixed matrix membranes blending with the TiO2/Bi3O4Cl 2D/2D heterojunction for photocatalytic degradation of tetracycline
APPLIED SURFACE SCIENCE(2022)
摘要
The photocatalytic composite membranes had becoming potential functional material for wastewater treatment because of facile separation of solid liquid phases after-treatment process. In this study, the 2D/2D TiO2/Bi3O4Cl heterojunctions were designed as a functional photocatalyst to prepare a series of PVDF photocatalytic membranes through phase inversion method. This tight-contact 2D/2D heterostructure results in shorter migration distance of photo-generated carriers to the surface of the 2D/2D TiO2/Bi3O4Cl heterojunctions, so that it can faster participation in photocatalytic degradation. Moreover, the 2D/2D heterostructure can improve the pore structure of membrane, which will enhance the porosity and mean pore size, and then providing more photocatalytic active sites for degradation process. As a result, under optimal conditions, the TiO2/Bi3O4Cl/PVDF membranes exhibited a higher tetracycline (TC) degradation rate of 88.85% in comparison with pure PVDF membranes. The cyclic degradation experiment proved that the TiO2/Bi3O4Cl/PVDF membranes showed good stability after several cycles. This work highlights the construction of 2D/2D heterojunction and the improvement of the photocatalyst property by special membrane structure and their application in wastewater treatment.
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关键词
Two-dimensional,TiO2/Bi3O4Cl heterojunction,Mixed matrix membranes,Photocatalytic degradation
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