Photoelectro-synergistic catalysis at Ti/TiO₂/PbO₂ electrode and its application on determination of chemical oxygen demand

In this paper, photoelectro-synergistic catalysis oxidation of organics in water on Ti/TiO₂/PbO₂ electrode was investigated by the method of electrochemistry. Furthermore, the results were compared with those obtained from photocatalysis and electrocatalysis. The method proposed was applied to determine the chemical oxygen demand (COD) value, Ti/TiO ₂/PbO₂ electrode functioning as the work electrode during the process. It was shown that the method of photoelectro-synergistic catalysis had lower detection limit and wider linear range than the methods of electroassisted photocatalysis and electrocatalysis. The results obtained by the proposed method and conventional one were compared by carrying out the experiment on 8 wastewater samples. The correlation of the results using different methods was satisfactory and the relative bias was below ±6.0%.