过渡金属离子调变对光催化氧化反应的影响

The Effect of Transition Metal Ions on Photocatalytic Oxidation in Aqueous Titanium Dioxide Suspensions

摘要: 考察过渡金属离子对TiO₂光催化活性的影响，并对过渡金属离子对催化剂TiO₂的光催化调变作用机理进行了初步探讨。结果表明，加入Cu(Ⅱ)可以大大提高TiO₂的光催化活性，反应75 min，可使活性艳蓝X-BR的COD_Cr的去除率达75%以上，对于活性艳红X-3B和活性艳黄X-6G的COD_Cr的去除率达到90%以上。过渡金属离子的调变作用是由于低价的金属离子与H₂O₂作用生成*OH自由基所致。

Abstract: This study focused on the effect of the dissolved transition metal ions on the photocatalytic oxidation in aqueous titanium dioxide suspensions and discussed the mechanism.The results indicated that the adding of a little amount of Cu(Ⅱ) can raise the photocatalytic oxidation efficiency,and the CODCr degradation of reactive red X-3B and reactive yellow X-6G is up to 90% and that of reactive blue X-BR is up to 75%,after reaction time of 75min.The improvement of the transition metal ions is due to product of *OH free radical from reaction of transition metals and H₂O₂.