TiO2／Ti电极上外加阳极偏压对亚甲基蓝光催化降解的影响

主要研究了在纳米多孔TiO2／Ti电极上外加阳极偏压对亚甲基蓝光催化降解的影响。另外还讨论了在TiO2／Ti中掺杂过渡族金属离子对亚甲基蓝降解情况的影响。降解程度通过亚甲基蓝的褪色情况来表征。实验结果表明，降解效率随着所加阳极偏压的增大而增大，直到阳极偏压达到3．5V，增大速率开始减小。掺杂Mn^2＋和Cr^3＋可以促进光电催化效率，而掺杂Ni^2＋却会降低光电催化效率。离子半径和各离子的功函数可以解释这种现象。

Effect of Applied Anodic Potential Bias on TiO2 Electrode upon Photocatalytic Degradation of Methylene Blue

The effect of applied anodic bias upon the photoelectrocatalytic degradation of methylene blue under ultraviolet illumination on nanoporous undoped TiO2/Ti electrode was studied in the present paper. The influence of doping different transition metal ions in TiO2/Ti on the degradation of methylene blue was also investigated.. The degradation degree was characterized with decolorization of methlylene blue. The results indicate that the degradation efficiency increases with increasing of the applied anodic bias up to 3.5 V, then decreases gradually. Doping TiO2 with Mn2+ and Cr3+ will enhance the efficiency of photoelectrocatalytic, while depositing Ni2+ on the TiO2 film shows a decrease of photoelectrocatalytic efficiency. The above metioned phenomena are attributed to ionic radii and the electron work functions values of the differently doped ions.