Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (04): 315-319.doi: 10.3866/PKU.WHXB19960406

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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

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