Degradation of chloramphenicol by Ti-Ag/γ-Al₂O₃ particle electrode using three-dimensional reactor

In this paper, highly efficient Ti-Ag/γ-Al₂O₃ particle electrodes were prepared for efficient degradation of chloramphenicol (CAP) by using three-dimensional electrocatalytic technology. The effects of preparation factors, such as mass ratio of Ti/Ag, loading times, and calcination temperature, on the electrocatalytic performance of Ti-Ag/γ-Al₂O₃ particle electrode were investigated. In addition, Ti-Ag/γ-Al₂O₃ particle electrodes under different conditions were characterized by SEM, EDS, XRF, and XRD. The optimal removal rate of chloramphenicol was 84.2% with initial concentration of chloramphenicol 100 mg/L, conductivity 6,000 µs cm^-1, initial pH 4.0, current intensity I = 0.2 A, and flow rate 1.0 L/min. The elimination of _•OH by addition of t-butanol reduced the chloramphenicol removal rate by 56.0% under the same working conditions, indicating that the degradation of chloramphenicol was caused by the combination of _•OH indirect oxidation and anodic indirect oxidation. Meanwhile, the degradation process of chloramphenicol was approximately in accordance with the first-order kinetic equation.