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Acid blue 92 photocatalytic degradation in the presence of scavengers by two types photocatalyst
Author(s) -
Elahifard Mohammad Reza,
Gholami Mohammad Reza
Publication year - 2012
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.10558
Subject(s) - photocatalysis , photodegradation , photochemistry , degradation (telecommunications) , visible spectrum , photodissociation , scavenger , chemistry , nuclear chemistry , catalysis , materials science , radical , organic chemistry , telecommunications , optoelectronics , computer science
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 2 O 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 2 O 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. © 2011 American Institute of Chemical Engineers Environ Prog, 2011