Photoelectrocatalytic oxidation of rose bengal in aqueous solution using a Ti/TiO2 mesh electrode

To further improve the photooxidation techniques for water and wastewater purification, a new type of photoelectrode, Ti/TiO2 mesh electrode,was Successfully prepared by anodizing Ti mesh in 0.5 WI H2SO4 solution. The structural and surface morphology of the Ti/TiO2 electrode was examined by Raman spectroscopy and scanning electronic microscopy (SEM), respectively. The examination results indicated that its structure and properties were affected by its growth rate in the anodization process, and anatase TiOP was dominant in its composition. The photo catalytic (PC) oxidation a nd photo electrocatalytic (PEC) oxidation of rose Bengal (RB) in aqueous solution using the Ti/TiO2 electrode were investigated and compared. The experimental results demonstrated that the PEC oxidation by applying an electrical bias between the TV TiO2 electrode and Pt electrode could significantly enhance the degradation rate of RE compared with the PC oxidation. It was found that the best performance of PEC oxidation was achieved by applying an electrical bias of 0.6 V. The efficiency of PEC oxidation was also compared with that of conventional PC oxidation in TiO2 suspension. The kinetic coefficient k for the PEC oxidation was determined to be between that of conventional PC oxidation in 0.3% and 1% TiO2 suspensions.