Comparative Studies on Degradation of Phenol by Ti /BDD Electrode and Ti /IrO₂- RuO₂ Electrode

The performance of two electrodes-a titanium- based oxide electrode(DSA) and a boron- doped diamond electrode(BDD) was investigated by comparing the degradation ability of two electrodes on recalcitrant pollutants- phenol in electrolytic sewage system. The electrochemical behaviors of the electrodes were investigated by cyclic voltammetry. Making methylene blue as an oxide trapping agent, in the same experimental conditions, the speed that the DSA electrodes produce ClO^- is much larger than the speed BDD electrode produce ·OH. Phenol solution was electrochemical oxidation gradated for 48 hours with two electrodes respectively; the result shows that the removal rate of phenol is almost 100% by BDD electrode while it is only 35. 61% by IrO₂- RuO₂ electrode. The removal rate of COD in wastewater is 27. 83% by IrO₂- RuO₂ electrode and 95. 35% by BDD electrode in which intermediate products is not easy to be accumulate. The BDD electrode exhibits good application prospect in environmental protection.