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.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2005年第1期39-43,共5页
Acta Energiae Solaris Sinica
关键词
TIO2
光催化
紫外光
可见光
染料污染物
Decomposition
Environmental engineering
Light
Oxidation
Photocatalysis
Photodegradation
Titanium dioxide
Ultraviolet radiation
Wastewater disposal
