Mechanism for Oxidative Decomposition of Anthraquinone Dye with Hydrogen Peroxide

Autor:	Yoji Kinoshita, Takayasu Kubozono, Nobuyuki Yamamoto
Rok vydání:	2001
Předmět:	General Chemical Engineering General Medicine General Chemistry Oxidative phosphorylation Photochemistry Decomposition chemistry.chemical_compound Electron transfer Phthalic acid chemistry Elementary reaction Oxidizing agent Hydrogen peroxide Chemical decomposition
Zdroj:	Journal of Oleo Science. 50:507-513
ISSN:	1347-3352 1345-8957
Popis:	Hydrogen peroxide has been used in detergent products as a bleaching agent for many years owing to its oxidizing capacity. In bleaching, decoloration occurs through oxidative decomposition of colored stain with hydrogen peroxide. The mechanism for this process has been extensively studied but detailed aspects remain unclarified. This study was conducted to provide further clairfication of this mechanism using the anthraquinone dye, Alizarin Red S (ARS), as a model of colored stain. ESR was carried out for analysis of decomposition reactions of ARS. Four radical intermediates were noted to be formed through three elementary reactions. The first intermediate was to be a semiquione radical of ARS, suggesting oxidative decomposition initiated by one-electron transfer from the dye to hydrogen peroxide. This intermediate induced the second decomposition by attacking hydrogen peroxide anions to afford two second intermediates, is followed by formation of phthalic acid as the final product. Kinetic study indicated the formation of the first intermediate, i.e., electron transfer from hydrogen peroxide to the dye, to be the rate-determining step of oxidative decomposition.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1df33d72b48554627d7c4e24f00ae9d2 https://doi.org/10.5650/jos.50.507 Zobrazit plný text záznamu