Journal
APPLIED CLAY SCIENCE
Volume 192, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.clay.2020.105627
Keywords
Z-scheme; Photocatalytic; Cr(VI) reduction; Layered double hydroxide
Funding
- Key Research and Development Program of Hunan Province [2018SK20110]
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Construction of the Z-scheme heterojunction photocatalytic system is a promising strategy for improving the catalytic activity of photocatalysts. Herein, a novel Z-scheme AgBr@Ag/CoAl layered double hydroxide (LDH) photocatalyst was successfully prepared. The AgBr@Ag/LDH composites displayed superior performance for Cr (VI) reduction under visible light. The optimal composite with a 10 wtWo silver content showed the highest photocatalytic activity, which was 12.2 and 12.8 times greater than that of LDH and AgBr, respectively. Furthermore, this composite also exhibited good photocatalytic stability towards Cr(VI) reduction without an obvious decrease after 5 cycles. The formation of a Z-scheme heterojunction in the AgBr@Ag/LDH composite effectively promoted the separation of photogenerated electron-hole pairs and kept the electrons with a high reducing capability in the conduction band of LDH, thus leading to its excellent photocatalytic activity towards the reduction of Cr(VI). This study may provide an insight into the design of the LDH-based Z-scheme photocatalytic systems for Cr(VI)-containing wastewater treatment.
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