The decomposition of H2O2 at the Ti-based oxide electrode coated with IrO2,RuO2 and TiO2 (Ti/ IrO2/RuO2/TiO2) prepared by thermal decomposition,was investigated in the electrolysis system of constant potential and the...The decomposition of H2O2 at the Ti-based oxide electrode coated with IrO2,RuO2 and TiO2 (Ti/ IrO2/RuO2/TiO2) prepared by thermal decomposition,was investigated in the electrolysis system of constant potential and the non-electrolysis system respectively.Additionally,the influence of the decomposition of H2O2 caused by Ti-based oxide electrode on the oxidation of aniline was also investigated.The results showed that both higher loading of oxides and higher pH were able to accelerate the decomposition of H2O2 in the non-electrolysis system and in this case the decay of H2O2 was mainly caused by the catalytic action of the oxides coating.In the electrolysis system with Ti-based oxides electrode as anode,the decay rate of H2O2 increased with increasing anodic potential.In this case,the decay of H2O2 involved two mechanisms: catalytic decomposition and electrochemical oxidation.It was also found that the catalytic decomposition of H2O2 at the oxides electrode was useless to the oxidation of aniline while the electrochemical oxidation of H2O2 was only slightly helpful to the oxidation of aniline.This work suggested that using the appropriate anodes of less H2O2 decomposition as well as reasonable potential in the electro-Fenton process could achieve high chemical efficiency of H2O2.展开更多
文摘The decomposition of H2O2 at the Ti-based oxide electrode coated with IrO2,RuO2 and TiO2 (Ti/ IrO2/RuO2/TiO2) prepared by thermal decomposition,was investigated in the electrolysis system of constant potential and the non-electrolysis system respectively.Additionally,the influence of the decomposition of H2O2 caused by Ti-based oxide electrode on the oxidation of aniline was also investigated.The results showed that both higher loading of oxides and higher pH were able to accelerate the decomposition of H2O2 in the non-electrolysis system and in this case the decay of H2O2 was mainly caused by the catalytic action of the oxides coating.In the electrolysis system with Ti-based oxides electrode as anode,the decay rate of H2O2 increased with increasing anodic potential.In this case,the decay of H2O2 involved two mechanisms: catalytic decomposition and electrochemical oxidation.It was also found that the catalytic decomposition of H2O2 at the oxides electrode was useless to the oxidation of aniline while the electrochemical oxidation of H2O2 was only slightly helpful to the oxidation of aniline.This work suggested that using the appropriate anodes of less H2O2 decomposition as well as reasonable potential in the electro-Fenton process could achieve high chemical efficiency of H2O2.
