Photocatalytic degradation of tetracycline through PMS-assisted Ce-modified BiOBr under visible light
The Ce(Ⅲ)modified BiOBr catalyst(Ce/Bi molar ratio 0.1%～2%)was prepared by solvothermal synthesis method,and its structure was characterized by XRD,SEM-mapping,XPS and UV-Vis.Taking tetracycline as the target pollutant,a PMS/Ce(Ⅲ)modified BiOBr photocatalytic system was proposed for the first time to degrade tetracycline.The effects of catalyst type,catalyst dosage,molar concentration of PMS and pH on the degradation of tetracycline in the reaction system were investigated.The results showed that the isomorphic substitution of Ce(Ⅲ)and Bi(Ⅲ)made the maximum absorption wavelength of Ce(Ⅲ)modified BiOBr appear blue shift,which improved the separation efficiency of photogenerated electrons and holes.The optimal conditions for photocatalytic degradation of tetracycline by BiOBr modified by PMS and Ce(Ⅲ)were as follows:molar ratio of Ce to Bi was 1%,with a dosage of 1.0 g/L and PMS of 0.3 mmol/L,at pH=9.In the process of tetracycline degradation,the main active species in the reaction system were holes,whose contribution was much higher than that of sulfate radical and singlet oxygen.It is proved that the structure of Ce modified BiOBr material has good stability by repeated utilization experiment.
Ce/BiOBrPMSphotocatalytic degradationtetracyclineactive species
国家科技期刊平台
NSTL
万方数据
维普
