物理化学学报 >> 1996, Vol. 12 >> Issue (04): 315-319.doi: 10.3866/PKU.WHXB19960406

研究论文 上一篇    下一篇

对位取代苯磺酸钠在溶液及界面的光反应研究

王素华,陈德文   

  1. 中国科学院化学研究所,北京 100080
  • 收稿日期:1995-07-06 修回日期:1995-10-06 发布日期:1996-04-15
  • 通讯作者: 陈德文

The Study on the Photochemical Degradation of ρ-Substituted Sdium Phenylsulphonate

Wang Su-Hua,Chen De-Wen   

  1. Institute of Chemistry,Academia Sinica,Beijing 100080
  • Received:1995-07-06 Revised:1995-10-06 Published:1996-04-15
  • Contact: Chen De-Wen

摘要:

用自旋捕捉-ESR方法研究了对位取代苯磺酸钠在水溶液中的光化学行为,结果表明pH的改变及半导体胶体的存在都能影响其光解过程,使产生的中间体发生变化,发现光解过程中产生的中间体之一是硫中心自由基SO3-,在一定的pH范围还有C中心自由基和氢自由基生成,在较低pH范围,初始反应速率与pH值呈指数关系。

关键词: 自旋捕捉-ESR, 磺酸盐, 光解, CdS胶体, 自由基

Abstract:

The photoreaction behaviour of p-substituted sodium phenylsulphonate in aqueous solution and colloidal system has been studied by means of spin trapping-ESR method. The results indicated that the reaction processes and the intermediate free radicals formed were dependent of the pH values as well as the existence of colloid. The sulfur-centered radicals SO3- , which were the main product were observed, and the carboncentered radicals and hydrogen radicals were also detected in a certain range of pH values. It was discovered that the primary rate of free radical generation changed with the pH values in an exponential from while pH<4.

Key words: ESR-spin traping, Sodium sulfanilate, Photolysis, CdS colloid, Radical intermediate