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/cm(2); the initial concentration of 2, 4-DCP is 94.1 mg/L; Volume: 100mL).