Fabrication of CdS/ZnCr-LDH heterojunctions with enhanced of tetracycline hydrochloride photocatalytic degradation under visible light
Optical Materials(2023)
Abstract
Water pollution caused by antibiotics is one of the main problems facing mankind. Photocatalytic degradation is a green, thorough and effective method to remove antibiotics from wastewater, which has broad application prospects. In this study, a Z-scheme photocatalyst constructed by cadmium sulfide (CdS) and ZnCr-layered double hydroxide (ZnCr-LDH) was prepared by hydrothermal method. The properties of the photocatalysts were fully characterized and the photocatalytic performance were evaluated via degradation tetracycline hydrochloride (TCH) under visible light irradiation. The CdS/ZnCr-LDH-5 photocatalyst was very effective for the removal of TCH (84.9%), which is 4.7 times and 2.5 times than that of its precursor ZnCr-LDH and CdS, respectively. The enhanced degradation efficiency of CdS/ZnCr-LDH-5 photocatalyst can be attributed to the high redox ability and charge separation efficiency. Finally, possible degradation pathway and a Z-scheme degradation mechanism was proposed according to the liquid chromatography-mass spectrometry (LC-MS), radial trapping experiments and band energy structure, respectively. This work provides new sights for the design heterojunctions with a Z-scheme charge transfer mechanism for effective photocatalytic degradation antibiotics.
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Key words
CdS,ZnCr-LDH,Tetracycline hydrochloride,Photocatalysis,Mechanism
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