Study on the performance of vanadium doped NaNbO3 photocatalyst degradation antibiotics

In this paper, by adjusting the mass ratio of Nb2O5, NaOH and V2O5, the hydrothermal synthesis method was used to successfully dope vanadium into NaNbO3 to prepare Vanadium-doped NaNbO3 powder. The modified constitution and structure of Vanadium-doped NaNbO3 are characterized through X-ray Diffraction, Scanning Electron Microscope and Energy Spectrum, and Ultraviolet–Visible Diffuse Reflection Spectrum representation. The results show that doping with V2O5 can reduce the band gap of NaNbO3 and increase its utilization of visible light. Under light radiation, Vanadium-doped NaNbO3 exhibits excellent photocatalytic degradation activity for the degradation of tetracycline, ciprofloxacin and enrofloxacin. The degradation rate of modified NaNbO3 with the most applicable quantity of V2O5 on Tetracycline within 90 min can reach 61%, the degradation rate on Ciprofloxacin within 150 min can reach 76%, and the degradation rate on Enrofloxacin within 150 min can reach 64.6%. Through cycled degradation experiment, we find that Vanadium-doped NaNbO3 Photocatalyst has good photocatalytic stability. This paper also uses high performance liquid chromatography-tandem mass spectrometer to analyze the tetracycline solution under different light time, and speculates the molecular formula and structural formula of the intermediate product that may be produced by the tetracycline molecule in the photocatalytic degradation process. In addition, the photocatalytic degradation mechanism and possible degradation pathways of tetracycline were also discussed. This article can provide a reference for the actual antibiotic wastewater treatment.