Acta Phys. -Chim. Sin. ›› 1994, Vol. 10 ›› Issue (07): 597-603.doi: 10.3866/PKU.WHXB19940705

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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


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