A Novel Modified PbO2 Electrode for Chlorphenol Oxidation in Water

Different metal (Bi, Ni, La, Ce and Er) doped PbO₂ electrodes were successfully prepared by electro-deposition method, and their electrocatalytic degradation capacity for 2, 4-dichlorphenol (2, 4-DCP) in water was compared in a batch experiment. The electrodes were characterized by scanning electron microscope (SEM). The morphology and component analysis showed that metal (Bi, Ni, La, Ce and Er) was scattered between PbO₂ crystals and thus enlarged the effective area and decreased the internal stress in the PbO₂ film, which was beneficial to 2, 4-DCP degradation. 2,4-DCP degradation using different metal (Bi, Ni, La, Ce and Er) doped PbO₂ electrodes as anode was in good agreement with the pseudo-first-order model. After 60 min electrolysis, the removal rate for 2,4-DCP and COD on Er-PbO₂ electrode was 92.9% after 60 min and 65.8% after 360 min, respectively, and the voltage and its change amount is relatively lower, indicating that Er-PbO₂ electrode exhibited higher capacity for 2,4-DCP degradation and better stability (the constant current density: 5mA/cm²; the initial concentration of 2, 4-DCP is 94.1 mg/L; Volume: 100mL).