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Acid blue 92 photocatalytic degradation in the presence of scavengers by two types photocatalyst

Elahifard, M. R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/ep.10558
  3. Abstract:
  4. Two types of nanosized photocatalyst, TiO 2 P-25 and ap/Ag/AgBr/TiO 2, were used for decolorization of Acid Blue 92 (AB92) in dark, visible light (V-L), and UV media. Under UV and V-L, the effect of three possible photodegradation processes of AB92 including photocatalytic degradation, self-photosensitization, and direct photolysis were studied. Results showed that in UV/photocatalysts, photocatalytic degradation is the major process for photodecolorization. However, in the presence of TiO 2, self-photosensitization has the major role under V-L. Because of the presence of AgBr as photoactive center in ap/Ag/AgBr/TiO 2, the main process is the photocatalytic degradation in V-L. By using isopropanol and catalase as •OH and H 2O 2 scavenger, the results showed that in ap/Ag/AgBr/TiO 2, •OH and hole act as AB92 oxidizer, respectively, while in TiO 2, •OH, hole, and also H 2O 2 play that role. Meanwhile, AB92 showed a different regular behavior with KI in photodegradation processes. This phenomena is assisted by the formation of I 2 in photocatalytic process. By direct oxidation, I 2 increases the reaction rate and shifts the maximum wavelength absorption of AB92
  5. Keywords:
  6. Acid Blue 92 ; Photocatalytic degradation ; Scavenger ; Self-photosensitization ; Ap/Ag/AgBr/TiO 2 ; Direct oxidation ; Direct photolysis ; Iso-propanols ; Main process ; Nano-sized photocatalyst ; Photo catalytic degradation ; Photodecolorization ; TiO ; UV- and visible light ; Visible light ; Photolysis ; Potassium iodide ; Reaction rates ; Silver halides ; Titanium dioxide ; Photodegradation
  7. Source: Environmental Progress and Sustainable Energy ; Volume 31, Issue 3 , 2012 , Pages 371-378 ; 19447442 (ISSN)
  8. URL: http://onlinelibrary.wiley.com/doi/10.1002/ep.10558/abstract