The Z-scheme heterojunction WO2/Ag3VO4 composite photocatalyst was prepared by hydrothermal and ultrasonic assisted precipitation methods.Various characterization techniques were employed to analyze its crystal structure,morphology,and performance.The photocatalytic activity of the WO2/Ag3VO4 composite catalyst was evaluated using tetracycline hydrochloride(TCH)as the degradation target.The results revealed that simple orthorhombic WO2 was deposited onto the surface of monoclinic Ag3VO4,creating a Z-scheme heterojunction structure.This structure and the Ag0 generated by the photocorrosion of Ag3VO4 accelerated the recombination of ineffective electron-hole pairs,promoted the separation of effective photogenerated carriers,and enhanced the visible light catalytic activity of the WO2/Ag3VO4 composite catalyst.The degradation effect of the catalyst on TCH was noticeably superior to that of pure WO2 and Ag3VO4,with 5 wt％WO2/Ag3VO4 having the best performance,achieving a degradation rate of 85.8％for TCH under visible light for 3 hours.The degradation process conformed to the first-order kinetic reaction model.
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