不同光源对TiO_2光催化降解染料污染物的影响  

PHOTODEGRADATION OF DYE POLLUTANTS OVER TiO_2 PARTICLES UNDER UV-Vis LIGHT IRRADIATION

作　　者：王侃[1] 陈英旭[1] 叶芬霞[2] 

机构地区：[1]浙江大学环境工程系,杭州310029 [2]宁波高等专科学校化工系,宁波315016

出　　处：《太阳能学报》2005年第1期39-43,共5页Acta Energiae Solaris Sinica

摘　　要：考察了在紫外光和可见光作为光源时,TiO_2光催化降解偶氮染料酸性橙7(AO7)的差异。实验结果表明,在两种不同的光源下,AO7都能够被有效地降解,而且AO7降解都是以C-N化学键的断裂开始的。以可见光作为光源时,AO7分子结构中的苯环较难开环,AO7的矿化率比较低;而以紫外光作为光源时,AO7能够被彻底矿化。另外,以可见光作为光源时,AO7的降解反应主要发生在催化剂的表面,而以紫外光作为光源时, AO7的降解反应主要发生在溶液中。The photodegradation of an azo-dye acid orange 7 (AO7) in water was investigated over TiO2 particles under UV-Vis light irradiation. Under UV-Vis light irradiation, AO7 can be easily decomposed in the presence of TiO2 particles and the initial step of the degradation was the break of the single bond of C-N from azo group connecting with benzene ring. The mineralization rate of AO7 on TiO2 particles under UV light irradiation was much high than that under visible light irradiation. Moreover, the degradation of AO7 under visible light irradiation occurs at the TiO2 particles surface and not in the solution. In contrast, under UV light irradiation, the degradation takes place in the solution.

关 键 词：TIO2 光催化 紫外光 可见光 染料污染物 

分 类 号：TK519[动力工程及工程热物理—热能工程]