Effect of electrolyte types on electro-catalytic degradation of phenol
电解质种类对电催化氧化降解苯酚的影响

In order to investigate the effect of different electrolytes on electro-catalytic oxidation activity, Ti/SnO2+Sb2O3 anode, characterized by SEM and XRD, was prepared by thermal oxidation method. The removal rate of phenol model organic compound was investigated in NaCl, Na2SO4 and NaNO3 electrolytes, respectively. Cyclic voltammetry was used to study the electro-chemical behavior of phenol in three different electrolytes. The oxidation product in different electrolytes was determinated by iodometric titration method. The results indicated that the Ti substrate was covered orderly and completely by an active layer which contained high content of SnO2 and low content of Sb2O3. The removal rate of phenol was higher in NaCl electrolyte than that of Na2SO4 or NaNO3 electrolyte. The degradation of phenol was prominently in-direct oxidation of HClO and/or ClO- which was electro-generated on the electrode surface in NaCl electrolyte. When Na2SO4 electrolyte was used, it was benefit for decreasing and stabilizing the cell voltage. In addition, the degradation of phenol all followed the first-order kinetics in three different electrolytes. The concentration of oxidants in NaCl solution was the highest in three electrolytes, and the concentration increased with the degradation time.