Kinetics and mechanism of the uncatalyzed and Ag(I)-catalyzed oxidative decolorization of Sunset Yellow and Ponceau 4R with peroxydisulphate

被引：27

作者：

Gemeay, Ali H. ^{[1
]}

Habib, Abdel-Fattah M. ^{[1
]}

El-Din, Mostafa A. Borhan ^{[1
]}

机构：

[1] Tanta Univ, Fac Sci, Dept Chem, Tanta, Egypt

来源：

DYES AND PIGMENTS | 2007年 / 74卷 / 02期

关键词：

Sunset Yellow; Ponceau; 4R; peroxydisulphate; catalysis; kinetics;

D O I：

10.1016/j.dyepig.2006.03.006

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The kinetics and mechanism of the oxidation of Sunset Yellow (E-110, C.I. 15985), SY, and Ponceau 4R (E-124, C.I. 16255), PR, monoazo dyes with peroxydisulphate have been investigated. The oxidation reaction of SY and PR was very slow and followed a zero-order kinetics for 02-j [dye] and a first-order kinetics for [S2O82-]. The reaction showed an activation energy of 102.3 kJ/mol and 96.2 kJ/mol for SY and PR, respectively. The rate of the Ag(I)-catalyzed oxidation reaction was higher with an activation energy of 46 kJ/mol and 45 kJ/mol for SY and PR, respectively. The activation parameters, Delta H#, Delta G# and Delta S# were also deduced. A reaction mechanism was proposed for the oxidation reaction of SY and PR in the absence and in the presence of Ag(l). (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：458 / 463

页数：6

共 17 条

[1] Simultaneous determination of the colorants tartrazine, ponceau 4R and sunset yellow FCF in foodstuffs by solid phase spectrophotometry using partial least squares multivariate calibration [J].