CAJ | 학술논문

The decomposition of H_2O_2 at the Ti-based oxide electrode coated with IrO_2, RuO_2 and TiO_2 (Ti/ IrO_2/RuO_2/TiO_2) 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 H_2O_2 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 H_2O_2 in the non-electrolysis system and in this case the decay of H_2O_2 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 H_2O_2 increased with increasing anodic potential.In this case, the decay of H_2O_2 involved two mechanisms: catalytic decomposition and electrochemical oxidation.It was also found that the catalytic decomposition of H_2O_2 at the oxides electrode was useless to the oxidation of aniline while the electrochemical oxidation of H_2O_2 was only slightly helpful to the oxidation of aniline.This work suggested that using the appropriate anodes of less H_2O_2 decomposition as well as reasonable potential in the electro-Fenton process could achieve high chemical efficiency of H_2O_2.