Electron Spin Resonance Spin-Trapping Detection of Radical Intermediates in N-Doped TiO2-Assisted Photodegradation of 4-Chlorophenol

2006 ◽  
Vol 110 (7) ◽  
pp. 3061-3065 ◽  
Author(s):  
Hongbo Fu ◽  
Liwu Zhang ◽  
Shicheng Zhang ◽  
Yongfa Zhu ◽  
Jincai Zhao
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Spin Trapping ◽  
Doped Tio2 ◽  
Radical Intermediates ◽  
Spin Resonance ◽  
Resonance Spin

An electron spin resonance spin trapping investigation of azide oxidation on TiO2 powder suspensions

1988 ◽  
Vol 66 (1) ◽  
pp. 76-80 ◽  
Author(s):  
Andrea Maldotti ◽  
Rossano Amadelli ◽  
Vittorio Carassiti
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Spin Trapping ◽  
Tio2 Powder ◽  
Aqueous Alkaline Medium ◽  
Esr Spin Trapping ◽  
Spin Resonance ◽  
High Production ◽  
Resonance Spin ◽  
Spin Trapping Technique

The oxidation of azide has been studied on TiO2 powder suspensions in water, methanol, and mixtures of the two solvents. The esr spin trapping technique has been employed to provide evidence for the formation of azidyl radicals [Formula: see text]. The results show that an aqueous alkaline medium is necessary to obtain a high production of [Formula: see text] radicals. A mechanism is proposed whereby the oxidation of [Formula: see text] is mainly due to reaction with OH• radicals which are in turn generated upon capture of holes by OH− groups adsorbed on TiO2. Azidyl anions adsorb weakly on TiO2 and do not displace adsorbed OH− from the surface.

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