Abstract:In this paper, through sol-gel combustion method, CeFe0.8Co0.2O3(CFCO) nano-particle catalyst was prepared by incorporated Co into CeFeO3(CFO) perovskite lattice. The catalyst was characterized by XPS, XRD, SEM, TEM and other characterization techniques and the result shows that surface oxygen vacancies (VO) were formed on CFCO. It was also investigated the effects of potassium peroxymonosulfate dosage and pH on the degradation of CTD by CFCO. The use of 0.6g?L-1 CFCO and 0.8mmol?L-1 PMS led to complete degradation of 20mg?L-1 clothianidin (CTD) in pH=7 within 30min. And the degradation rate of clothianidin still reached 91.2% after four times of recycling. the highly efficient activation of CFCO for PMS was mainly attributed to the potential difference created by the lattice defects driving the rapid directional conduction of free electrons down the oxygen vacancies to the PMS. Meanwhile, in order to simulate the removal of CTD by CFCO photocatalytic activation of PMS in natural water environment. We perform comparative experiments with anionic and organic acids. The influence of different environmental factors on the degradation of clothianidin by catalyst was analyzed. In addition, through radical quenching experiment and ESR detection, it was determined that the active oxygen free radicals that played the main role in the experiment of degrading clothianidin by photocatalytic activation of PMS were 1O2 and ?OH, and the mechanism of free radicals generation was analyzed and speculated. The possible metabolites in the degradation of CTD were analyzed by high performance liquid chromatography-mass spectrometry (LC-MS), and three degradation paths were summarized.