摘要：

用泡沫镍负载TiO₂制作的电极作为工作电极，铂电极为对电极，饱和甘汞电极为参比电极，建立三电极的光电催化体系，以酸性红B（ARB）为研究对象，考察了该光电催化体系对有机物的降解性能。实验结果表明，在室温（29℃）条件下，外加电压0.05 V、溶液pH=4.0时，紫外光照120 min降解率可达85.5%；动力学研究表明，该反应为一级反应，其活化能为32.75 KJ/mol；降解前后溶液的紫外-可见吸收光谱表明，ARB得到了破坏，基本分解成小分子物质。

关键词: 光电催化, 酸性红B, TiO2, 降解

Abstract:

Using the immobilized TiO₂ thin film electrode deposited on porous nickel as working electrode,Pt as the counter electrode and saturated calomel electrode as the reference electrode,the photoelectroeatalytic(PEC) system has been built.The system is used for degrading acidic red B(ARB)in aqueous solution.The results show that under the conditions of external bias potential 0.05 V,pH=4.0 and 120 min ultraviolet irradiation at room temperature(29℃),the degradation efficiency of ARB reaches 85.5%.The kinetic study shows that the apparent rate constant of degradation reaction is the first grade reaction and its activation energy is 32.75 kJ/mol. UV-vis spectra analysis of the aqueous solution in the process of degradation show that the ARB has been demolished and degraded into substances with small molecules.

Key words: photoelectrocatalysis , acidic red B , TiO₂ , degradation

中图分类号: 

• X703.1