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介绍了具有合成H2 O2 和光催化性能的双功能新型复合电极 .双功能复合电极是将TiO2 /C光催化剂负载在具有合成H2 O2 性能的新型载体上形成的 .在光反应器中 ,复合电极作阴极 ,钌 -钛不溶性电极作阳极 ,低压汞灯作光源 ,实现了光化学氧化与光催化氧化在同一电极 /溶液界面上的联合作用 .当反应器工作时 ,复合电极中的TiO2 /C光催化层表面进行着光催化反应 ,在载体的三相界面上进行着O2 的 2电子还原生成H2 O2 的电化学反应 ,电流效率达 82 %(J =15mA/cm2 ) ,为·OH自由基的生成提供了物质源 ,而且氧的 2电子还原反应电位使其表面的TiO2 获得相对于平带电位约 +0 .5V的阳极偏压 ,改善了TiO2 的光催化活性 .实验结果表明 ,复合电极对提高偶氮染料分子活性艳红 (K 2BP)的氧化降解速度起了重要作用 .实验发现偶氮染料分子在复合电极表面的吸附量与反应速度密切相关 .文中讨论了复合电极的作用原理及偶氮染料分子的氧化降解过程 .
A new dual-function composite electrode with H2O2 and photocatalytic properties was introduced. The bifunctional composite electrode was formed by loading TiO2 / C photocatalyst on a novel carrier with H2O2 performance. In the photoreactor, Cathode, ruthenium-titanium insoluble electrode as anode and low-pressure mercury lamp as light source, the combined effect of photochemical oxidation and photocatalytic oxidation on the same electrode / solution interface was achieved.When the reactor operated, the photocatalytic activity of TiO2 / C in the composite electrode The photocatalytic reaction was carried out on the surface of the layer, and the electrochemical reaction of 2-electron reduction of O2 to H2O2 was carried out on the three-phase interface of the carrier. The current efficiency was 82% (J = 15mA / cm2) Provided the material source, and the 2-electron reduction reaction potential of oxygen provided an anode bias of about +0.5 V with respect to the flat band potential to improve the photocatalytic activity of TiO2. The experimental results show that the composite electrode pair is improved The oxidative degradation of azo dye molecules reactive brilliant red (K 2BP) played an important role.It is found that the adsorption amount of azo dye molecules on the surface of the composite electrode is closely related to the reaction rate. The theory and discussed in the oxidative degradation of the composite electrode of azo dye molecules.