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AbstractPhotocatalytic degradation of oxytetracycline hydrochloride (OTC‐HCl) in marine aquaculture wastewater and therefore the effects of factors on the effectiveness of photocatalysts are studied in this paper using Zn0.75Mn0.75Fe1.5O4/ZnFe2O4/ZnO under visible light and changing the molar ratio of Zn2+:Fe3+:Mn2+, calcination temperature of catalysts, hydrogen peroxide concentration, dose of catalysts, illumination time of photocatalytic and initial concentration of OTC‐HCl. The degradation of OTC‐HCl in marine aquaculture wastewater was optimized by orthogonal experiment. The best effect exists when the molar ratio of Zn2+:Fe3+:Mn2+ was 10:1:3, the calcination temperature of photocatalyst was 400°C, the concentration of hydrogen peroxide was 0.5 g/L, the dose of catalysts was 0.6 g/L, the illumination time was 2.5 h and the initial concentration of OTC‐HCl was 0.010 g/L. The degradation rate of OTC‐HCl can reach 80.18%. Zn0.75Mn0.75Fe1.5O4/ZnFe2O4/ZnO can effectively degrade the OTC‐HCl in marine aquaculture wastewater under visible light.

AbstractIn this study, TiO2/Carbon fibre (CF) composite photocatalyst was prepared by sol‐gel method, and its characterization was analysed by SEM and XRD. Under the ultraviolet light, the effects of various single factors on the removal of ammonia nitrogen from aquaculture wastewater by TiO2/CF were discussed. Orthogonal experiments were performed to determine the most beneficial conditions for ammonia nitrogen removal. When the dosage of TiO2/CF was 2.0 g/L, the initial concentration of ammonia nitrogen was 30 mg/L, the calcination temperature was 600°C, the concentration of H2O2was 0.8 g/L, the illumination time was 1 hr, TiO2/CF had excellent performance of remove ammonia nitrogen. The results show that compared with the treatment of ammonia nitrogen by CF or TiO2, TiO2/CF was more effective in the removal of ammonia nitrogen. TiO2/CF composite material was applied to the treatment of ammonia nitrogen in marine aquaculture wastewater for the first time, which provides a scientific and effective treatment method for photocatalytic technology in later industrial treatment process.