摘要
在TiO2 (DegussaP2 5)和波长大于 3 50nm的光作用下 ,水中苯乙酮 ( 1× 1 0 -5～ 1× 1 0 -4 mol/L)能发生光催化降解 ,生成邻羟基苯乙酮等中间产物 .该降解过程遵循Langmuir Hinshelwood动力学方程 ,降解速率随入射光强度的增强和溶液起始 pH值的增大而增大 ,但反应温度的影响较小 ,其降解反应的表观活化能为4 2～ 6
The photocatalytic degradation of acetophenone in TiO 2 aqueous suspension has been studied with the light irradiation of wavelength λ ≥350 nm under different conditions of light intensity, initial concentration, pH and temperature. 2 Hydroxylacetophenone was identified as the main intermediate, which experienced a simultaneous photodegradation in the system. The measured pseudo first order rate constant was found to decrease gradually with the initial concentration of acetophenone, but the raw data fitted the Langmuir Hinshelwood kinetic equation very well. The degradation rate was larger in a basic medium, and got increased as well under the light irradiation of higher intensity. The apparent Arrehenius activation energy was also evaluated to be 4.2—6.4 kJ/mol. [WT5HZ]
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第10期1539-1542,共4页
Chemical Journal of Chinese Universities
关键词
苯乙酮
二氧化钛
光催化降解
催化活性
Acetophenone
Titanium dioxide
Photocatalysis
Influence factors
