Study on the Degradation of Chlortetracycline Hydrochloride in Mariculture Wastewater by Zn_(0.75)Mn_(0.75)Fe_(1.5)O_4/ZnFe_2O_4/ZnO Photocatalyst

摘要

The method of preparing Zn0.75Mn0.75Fe1.5O4/ZnFe2O4/ZnO photocatalyst was the precipitation grinding. This photocatalyst was characterized by UV-Vis, PL, EDS, SEM, and XRD. The results indicated the Zn0.75Mn0.75Fe1.5O4/ZnFe2O4/ZnO photocatalyst was highly active under the visible light. The photocatalytic degradation efficiency of chlortetracycline hydrochloride was analyzed in mariculture wastewater by various experimental parameters, namely calcination temperature, dosage of Zn0.75Mn0.75Fe1.5O4/ZnFe2O4/ZnO, Zn2+/Fe3+/Mn2+ molar ratio, H2O2 mass concentration, chlortetracycline hydrochloride initial concentration, and illumination time. The degradation of chlortetracycline hydrochloride in mariculture wastewater was optimized by orthogonal experiments. When the H2O2 mass concentration was 0.3 g/L, calcination temperature was 500 degrees C, Zn2+/Fe3+/Mn2+ molar ratio was 10:1:4, dosage of Zn0.75Mn0.75Fe1.5O4/ZnFe2O4/ZnO was 0.7 g/L, illumination time was 4.0 h, chlortetracycline hydrochloride initial concentration was 0.01 g/L, and the degradation rate of chlortetracycline hydrochloride reached 73.04% by Zn0.75Mn0.75Fe1.5O4/ZnFe2O4/ZnO photocatalyst. The degradation rate of chlortetracycline hydrochloride was 52.86% by ZnFe2O4/ZnO photocatalyst. The results indicated that the Zn0.75Mn0.75Fe1.5O4/ZnFe2O4/ZnO photocatalyst obviously enhanced the degradation rate of chlortetracycline hydrochloride, compared with pure ZnO and ZnFe2O4/ZnO photocatalyst.