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

To further improve the photooxidation techniques for water and wastewater p urification, a new type of photoelectrode, Ti/TiO2 mesh electrode,was Succe ssfully prepared by anodizing Ti mesh in 0.5 WI H2SO4 solution. The structu ral and surface morphology of the Ti/TiO2 electrode was examined by Raman s pectroscopy and scanning electronic microscopy (SEM), respectively. The exa mination results indicated that its structure and properties were affected by its growth rate in the anodization process, and anatase TiOP was dominan t in its composition. The photo catalytic (PC) oxidation a nd photo electro catalytic (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 deg radation rate of RE compared with the PC oxidation. It was found that the b est performance of PEC oxidation was achieved by applying an electrical bia s 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 oxi dation in 0.3% and 1% TiO2 suspensions.