Electrochemical degradation of chloramphenicol using Ti-based SnO2-Sb-Ni electrode

摘要

Antibiotic residues may be very harmful in aquatic environments, because of limited treatment efficiency of traditional treatment methods. An electrochemical system with Ti-based SnO-Sb-Ni anode was developed to degrade a typical antibiotic chloramphenicol (CAP) in water. The electrode was prepared by sol-gel method. The performance of electrode materials, impact factors and dynamic characteristics were evaluated. The Ti-based SnO2-Sb-Ni electrode was compact and uniform by the characterization of SEM and XRD. The electrocatalytic oxidation of CAP was carried out in a single-chamber reactor by using Ti-based SnO-Sb-Ni electrode. For 100 mg L CAP, the CAP removal ratio of 100 and the TOC removal ratio of 60 were obtained at the current density of 20 mA cm and in neutral electrolyte at 300 min. The kinetic investigation has shown that the electro-oxidation of CAP on Ti-based SnO-Sb-Ni electrode displayed pseudo first-order kinetic model. Free radical quenching experiments presented that the oxidation of CAP on Ti-based SnO-Sb-Ni electrode resulted from the synergistic effect of direct oxidation and indirect oxidation . Doping Ni on the Ti/SnO-Sb electrode for CAP degradation was presented in this paper, showing its great application potential in the area of antibiotic and halogenated organic pollutants degradation.