Study on Cationic Red X-GRL Removal with Ce Doped Electrode

Abstract This work investigated the degradation of cationic red X-GRL by electrochemical oxidation on a novel PbO2 anode modified by Ce. The optimized molar ratio of Pb: Ce was 200 mol: 4 mol for the X-GRL and TOC removals. The results showed a high current efficiency for effective X-GRL treatment. Under the optimal condition of current density 50 mA/cm2, Na2SO4 0.2 mol/L, initial quality concentration of X-GRL 100 mg/L, after 2h degradation, the X-GRL and TOC removals reached 93.45% and 48.23%, respectively. Based on the degradation intermediates identification, a simplified degradation pathway of cationic red X-GRL was proposed. Based on the analysis of scanning environmental microscopy (SEM), the surface of electrode had a dense structure and the preferred crystalline orientation, which was helpful to improve the catalytic activity of electrode and finally enhance the mineralization of X-GRL.