Copperoxidemodified TiO₂-based Tin Antimony Electrode For Catalytic Degradation Of Cephalosporins Antibioticsin Water

Pharmaceutical and personal care products(PPCPs)are emerging POPs that have received widespread attention around the word in recent years.Electrochemical advanced oxidation technology is often used to degrade such pollutants.Due to the low electrocatalytic activity and poor stability of traditional DSA electrodes,a novel Ti/TiO2/SnO2-Sb-Cu anode was developed and utilized to removel typical PPCPs,ceftazidime and cefepime in aqueous environment.Degradation efficiency and mechanisms were thoroughly investigated,the main results were as follows:1.Ti/SnO2-Sb,Ti/TiO2/SnO2-Sb,Ti/SnO2-Sb-Cu,and Ti/TiO2/SnO2-Sb-Cu were prepared by anodic oxidation and sol-gel method.SEM results showed that the addition of TiO2 interlayer and copper oxide modification contributed to the formation of a "dendritic" structure on the surface of the electrode.XRD and XPS showed that the grain size decreased from 66.94 nm to 41.97 nm and the adsorption oxygen concentration increased by 13.77%.The electrochemical performance test found that the oxidation peak response current increased 0.97 times,and the oxygen evolution potential increased from 2.1 V to 2.7 V.The electron transfer resistance decreased from 96.67 ?to 86.42 ?,which indicated that the electrode oxidation capacity was significantly improved,and the corrosion resistance and stability were significantly enhanced2.Ti/TiO2/SnO2-Sb-Cu electrode as the anode,the effects of different parameters on the degradation of 5 mg·L-1 ceftazidime and cefepime were investigated,andthe optimum reaction conditions were determined.The degradation rates of the two antibiotics were 97.65%and 99.76%,the mineralization rate could reach 39.27%and 41.09%,and the electrode process kinetics under different reaction parameters were studied.20 cycles of recycling showed that the prepared electrode had good stability.3.FTIR,UV spectra and HPLC-MS was used to analysis the degradation intermediates,and the degradation process of ceftazidime and cefepime in the reaction system was speculated.