TiO_2/γ-Al_2O_3与铁屑三维电极光电催化研究

Study on Photoelectrocatalytic of Three-dimensional Electrode Using TiO_2 /γ-Al_2O_3 and Scrap Iron

以微弧氧化法制备的钛基TiO2/Ti膜为阳极,以钛片为阴极,TiO2/γ-Al2O3与铁屑粒子组合作粒子电极,以Na2SO4为支持电解质,以亚甲基蓝为处理目标物,结合20W紫外灯和稳压电源组成三维电极光电催化体系,研究三维电极体系对光电催化的影响。实验结果表明:粒子电极5g铁屑和2g三层膜球状TiO2/γ-Al2O3粒子,亚甲基蓝溶液初始浓度为3mg/L,电源电压6V,Na2SO4电解质溶液浓度0.02mol/L,电极间距为4.5cm。三维电极光电催化3h的降解效率比传统二维电极光电催化的降解率提高了25%。

Titanium oxide film （TiO2/Ti） was formed on the titanium surface by micro-arc oxidation （MAO） in Na3 PO4 solution. And using the TiO2/Ti as anod electrode, the titani- um as counter electrode in the system of three-dimensional electrode. Coatedγ-A1203 （ TiO2/γ-Al203 ） that prepared by sol-gel dipcoating method, and scrap iron mixture as particle e- lectrode, combining with the UV lamp and regulated power supply make up the three-di- mensional electrode photoelectrocatalytic technology system. The photoelectrocatalytic abili- ty was evaluated by degradation of Methylene blue aqueous solution. When the Methylene blue concentration of 3mg/L, cell voltage of 6V, Na2SO4 aqueous solution concentration of 0.02M. Compared with traditional two-dimensional plate electrodes, the photoelectrocatalyt- ic technology of three-dimensional electrode degradation of Methylene blue increases 〉 25 % after 3 hours photoelectrocatalysis.