钒酸铋/氧化铜异质结的可控构筑及其光催化降解四环素性能研究OA

[Objective]To address the high carrier recombination rate and low degradation efficiency of traditional single-component photocatalysts,this study aims to construct efficient bismuth vanadate-copper oxide(BiVO4-CuO)heterojunction photocatalysts and investigate their performance in tetracycline degradation.[Methods]BiVO4-CuO heterojunction photocatalysts with different component ratios were prepared via a hydrothermal method and characterized using various analytical techniques to analyze their structural properties.The photocatalytic performance was evaluated using tetracycline as the target pollutant under visible light irradiation(λ>420 nm).The degradation mechanism was elucidated through kinetic analysis,active species trapping experiments,and electrochemical measurements.The effects of reaction temperature,pH,catalyst dosage,and initial tetracycline concentration on degradation efficiency were systematically investigated.[Results]The experimental results showed that 1)X-ray diffraction and high-resolution transmission electron microscopy confirmed the successful construction of a heterojunction structure with intimate contact between BiVO4(121)and CuO(-111)facets;2)under optimal conditions(catalyst dosage of 0.5 g/L;tetracycline concentration of 20 mg/L;pH 7.0),the BC-1 sample achieved an apparent rate constant of 0.021 6 min-1,with 90.3%degradation and 85.6%mineralization rates within 120 min;3)Mott-Schottky and X-ray photoelectron spectroscopy analyses verified the formation of a Z-scheme band structure favorable for carrier migration,extending the carrier lifetime to 15.6 ns;4)electron spin resonance and electrochemical tests revealed·O2-and·OH as the primary active species,achieving degradation through C—N and amide bond cleavage;5)after five cycles,the catalyst maintained 91.8%of its initial activity.[Conclusions]Through facet control and interface engineering,an efficient BiVO4-CuO heterojunction photocatalyst was successfully constructed.The Z-scheme band structure significantly enhanced the separation efficiency of photogenerated carriers,achieving effective degradation and mineralization of tetracycline.This work provides valuable insights for the development of high-performance composite photocatalytic materials.