吸附式纳米TiO2电极光电催化氧化罗丹明B研究

Study on Photoelectrocatalytic Oxidation of Rhodamine B with Adsorption Loaded Nano-TiO2 Electrode

关键词:  光电催化  吸附式负载  罗丹明B  多孔状金属

Key Words:photoelectrocatalytic  adsorption load  rhodamine B  porous metal

摘要:利用多孔金属基材料吸附式负载纳米TiO2作为光电阳极,与纳米TiO2胶体本身形成的多相光催化体系复合,进行光电催化与多相光催化复合氧化降解罗丹明B（一种人工合成有机染料）。使用分光光度计测定罗丹明B溶液的吸光度表征罗丹明B的降解率,证实吸附式纳米TiO2光电极催化氧化的光电协同作用。研究了偏电压、电解质、曝气速度、供氧方式等因素对光电催化氧化过程的影响。结果表明,光电催化延缓了光生电子和空穴的复合,提高了光催化效率,验证了光电协同作用；在偏电压为0.8 V、无水硫酸钠电解质为0.5 g/L、H2O2为2 mL/L供氧的条件下,光电催化氧化降解罗丹明B的效果最好,紫外灯照射15 min,罗丹明B的降解率达到97.4%。

Abstract:Using porous metal adsorption loaded nano-TiO2 as photoelectric anode in combination with nano-TiO2 colloid to create heterogeneous photocatalytic system and use for the oxidation degradation of rhodamine B. The degradation rate of rhodamine B was characterized with absorbance measured by spectrophotometer. The catalytic oxidation photoelectric synergy effect of the adsorption loaded nano-TiO2 photoelectrode was confirmed with the experimental results. The influence of bias voltage, electrolyte, the aeration speed and the way of oxygen supply on the process of photoelectrocatalytic oxidation was studied. The results indicated that the photocatalytic efficiency was improved by photoelectrocatalytic, and verified the photoelectric synergy effect, the reason of which was probably that the combination of electrons and holes was delayed, under the condition of the bias voltage was 0.8 V, 0.5 g/L anhydrous sodium sulfate was used as the electrolyte, and 2 mL/L H2O2 was used as oxygen source, the efficiency of photoelectrocatalytic oxidation degradation of rhodamine B was the best, UV light irradiation 15 min, the degradation rate of rhodamine B was 97.4%. This adsorption loading could also be applied to other porous metal material. The synergy mechanism of the adsorbed loaded photoelectrocatalytic and heterogeneous photocatalytic oxidation was also discussed.