Paper Title:
Photochemical Degradation of Azo Dyes in the Presence of Hydrogen Peroxide and Hematite under Visible Light Irradiation: Surface Complex Forming and Reaction Mechanism
  Abstract

The photochemical degradation mechanisms of an azo dye Direct Red 4BS and Methyl Orange on hematite in the presence of H2O2 were investigated. The decolorization of azo dyes was attributed to the forming surface complex between specific bond of the dyes and hematite, which facilitate the electron transfer from hematite to azo bond. No mineralization of azo dyes occurred in the presence of visible irradiation, only chromogenic group destroyed in the photo-chemical reaction process. Surface complex between azo dyes and hematite will be destroyed under alkaline solution which suggested the active site or the formed surface complex had been destroyed by OH. Chemical adsorption of the azo dyes on hematite was critical factor which affect the decolorization efficiency of the photoreaction.

  Info
Periodical
Advanced Materials Research (Volumes 287-290)
Chapter
Environmental Catalysis and Environmental Friendly Materials
Edited by
Jinglong Bu, Pengcheng Wang, Liqun Ai, Xiaoming Sang, Yungang Li
Pages
1612-1619
DOI
10.4028/www.scientific.net/AMR.287-290.1612
Citation
Y. C. Tang, X. H. Huang, H. Q. Yu, W. H. Li, C. N. Wu, "Photochemical Degradation of Azo Dyes in the Presence of Hydrogen Peroxide and Hematite under Visible Light Irradiation: Surface Complex Forming and Reaction Mechanism", Advanced Materials Research, Vols. 287-290, pp. 1612-1619, 2011
Online since
July 2011
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Price
$32.00
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