高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (10): 1539.

• 论文 • 上一篇    下一篇

苯乙酮的TiO2光催化降解及其影响因素

许宜铭   

  1. 浙江大学化学系, 硅材料科学国家重点实验室, 杭州 310027
  • 收稿日期:1999-08-18 出版日期:2000-10-24 发布日期:2000-10-24
  • 通讯作者: 许宜铭(1961年出生),男,博士,副教授,从事金属氧化物和配合物的光催化与光化学研究.

Photocatalytic Degradation of Acetophenone Mediated by TiO2 Under Different Experimental Conditions

XU Yi-Ming    

  1. State Key Laboratory of Silicon Material Science, Department of Chemistry, Zhejiang University, Hangzhou 310027, China
  • Received:1999-08-18 Online:2000-10-24 Published:2000-10-24

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摘要： 在TiO2(DegussaP25)和波长大于350nm的光作用下,水中苯乙酮(1×10-5～1×10-4mol/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4.2～6.4kJ/mol.

关键词: 苯乙酮, 二氧化钛, 光催化, 影响因素

Abstract: The photocatalytic degradation of acetophenone in TiO2 aqueous suspension has been studied with the light irradiation of wavelength λ ≥350 nm under different conditions of light intensity, initial concentration, pHand 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.

Key words: Acetophenone, Titanium dioxide, Photocatalysis, Influence factors

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