对位取代苯磺酸钠在溶液及界面的光反应研究

The Study on the Photochemical Degradation of p-Substituted Sodium Phenylsulphonate

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SO，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。

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 SO , 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 form while pH<4.