物理化学学报 >> 1994, Vol. 10 >> Issue (07): 597-603.doi: 10.3866/PKU.WHXB19940705

研究论文 上一篇    下一篇

苯酚类化合物在超微粒表面光解自由基的研究

王海, 陈德文, 徐广智   

  1. 中国科学院化学研究所,分子动态及稳态结构国家重点实验室,北京 100080
  • 收稿日期:1992-12-12 修回日期:1993-05-22 发布日期:1994-07-15
  • 通讯作者: 陈德文

ESR Studies of Active Free Radicals Produced in the Degradation Processes of Phenol Derivatives on the Surface of Superfine Colloid Particles

Wang Hai, Chen De-Wen, Xu Guang-Zhi   

  1. The State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Academia Sinica, Beijing 100080
  • Received:1992-12-12 Revised:1993-05-22 Published:1994-07-15
  • Contact: Chen De-Wen

摘要:

研究了苯酚及其衍生物在超细微粒二氧化钛表面的光诱导电子转移和光化学反应过程,结果表明,在碱性条件下,苯酚类化合物较易于光降解,所生成的主要自由基为氢原子和苯氧基,体系中的羟基来源于超氧负离子基,而并非经由氢氧根HO~-失去电子后转变为HO~·,文中对于光诱导电子转移及有关光反应机理进行了分析讨论。

关键词: 苯酚, 胶体, 光降解, 自由基, 电子自旋共振

Abstract:

The photo-induced electron transfer and photochemical of processes phenol and its derivatives on the surface of superfine titanium dioxide colloid particles were studied. It was demonstrated that phenol was more ready to degradate on colloid surface in basic solution. The main degradation products are hydrogen atom and benzene-oxyl radical. The hydroxyl radical of the system was formed from superoxide radical, and not from hydroxide anion. The mechanisms of the photo-induced electron transfer and photochemical reactions were discussed.

Key words: Phenol, Colloid, Photodegradation, ESR, Free radical