Study On Electro-Catalytic Oxidation Of Pyridine And Naphthalene With Rare Earths Doped Lead And Stannum DSA Electrodes

Electrocatalysis oxidation has been widely studied in wastewater treatment in recent years.The quality of anode materials directly affects the current efficiency of the whole reaction,so it is necessary to prepare anode with high catalytic performance.In this study,the modify dimensionally stable anodes?DSA?is doped with antimony-tin oxide?ATO?alone and cooperated with different rare earth elements,and the effects of modification on electrocatalytic properties,the patterns how modification affects the performance of DSA electrode are investigated;the optimum process conditions and oxidation behaviors of degradation of pyridine and naphthalene by the optimal modified DSA electrode are studied.By modifying DSA electrode,it was found that the optimal of doping amount ATO is2.5g/L and ATO modification can improve the removal rate of organic matter to some extent,especially the salinity;the optimal doping amounts of Ce^?+?Nd^?+?La^?+are 50:1,100:1and 25:1,respectively,and electrocatalytic properties Nd-ATO-DSA>ATO-DSA>Ce-ATO-DSA>La-ATO-DSA in ATO co-doped with different rare earths study.Factors influencing the performance of DSA electrodes were analyzed,including electrode integrity,surface-active sites,adsorbed oxygen,valence metal ions and oxygen evolution potential etc.With Nd-ATO-DSA electrode,conditions that the electrode spacing is 2.0 cm,the electrolyte Na₂SO₄ concentration of 0.25 mol/L,and the electrolysis time of 120 min as basic electrolytic condition,the removal rate of pyridine is highest,reaching 56.8%at the initial pH of 14,the current density of 30 mA/cm² and the initial mass concentration of 1000 mg/L;while the naphthalene highest removal rate is 98.1%at initial pH of 7,the current density of30 mA/cm²,and the initial mass concentration of 40 mg/L.The degradation process of pyridine and naphthalene on the surface of Nd-ATO-DSA electrode nearly follows the first order equation of kinetics.Electrochemical oxidation of pyridine and naphthalene on the Nd-ATO-DSA electrode is an irreversible electrode reaction under controlling of surface reaction.Figure 35;Table 16;Reference 72...