物理化学学报 >> 2007, Vol. 23 >> Issue (10): 1531-1536.doi: 10.1016/S1872-1508(07)60078-3

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苯并[a]蒽在TiO2颗粒表面的多相光化学反应

沈建东; 张士成; 连进军; 孔令东; 陈建民   

  1. 复旦大学环境科学与工程系, 上海 200433
  • 收稿日期:2007-05-31 修回日期:2007-06-22 发布日期:2007-10-01
  • 通讯作者: 张士成; 陈建民 E-mail:zhangsc@fudan.edu.cn, jmchen@fudan.edu.cn

Benz[a]anthracene Heterogeneous Photochemical Reaction on the Surface of TiO2 Particles

SHEN Jian-Dong; ZHANG Shi-Cheng; LIAN Jin-Jun; KONG Ling-Dong; CHEN Jian-Min   

  1. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, P. R. China
  • Received:2007-05-31 Revised:2007-06-22 Published:2007-10-01
  • Contact: ZHANG Shi-Cheng; CHEN Jian-Min E-mail:zhangsc@fudan.edu.cn, jmchen@fudan.edu.cn

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摘要： 利用原位漫反射红外光谱(DRIFTS)并结合气相色谱-质谱(GC-MS)分析研究了苯并[a]蒽(B[a]A)在TiO2颗粒气固界面的光化学反应过程. 结果表明, 在氙灯照射下, 苯并[a]蒽在TiO2颗粒气固界面发生光催化反应, 表面羟基和表面氧参与了光催化反应, 主要产物为苯并[a]蒽-7,12-二醌, 根据分析结果给出了苯并[a]蒽在TiO2颗粒表面的光化学反应机理模型. 在模拟太阳光(22 mW·cm-2)照射下, 苯并[a]蒽在TiO2颗粒表面的光降解过程符合指数衰减方程, 半衰期为6.8 min.

关键词: 苯并[a]蒽, TiO2, 光化学反应, DRIFTS

Abstract: The photochemical reaction of benz[a]anthracene (B[a]A) on TiO2 particles was investigated by using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and gas chromatography-mass spectrometry (GC-MS). It was confirmed that photocatalytic oxidation of benz[a]anthracene occured on the surface of TiO2 particles, and the surface hydroxyl and oxygen participated in the reactions. The main photochemical product of benz [a] anthracene was benz [a] anthracene-7,12-dione. Possible photochemical mechanism of benz[a]anthracene was also proposed. Under the simulated sun light irradiation (22 mW·cm-2), the process of benz[a]anthracene photodegration on TiO2 particles matches the exponential decay equation, and the half-life time is 6.8 min.

Key words: Benz[a]anthracene, TiO2, Photochemical reaction, DRIFTS