Kinetics and Mechanism of the Homogeneous Oxidation of Quinaldine Red by Hydrogen Peroxide
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Ibrahim A. Salem
The kinetics of the oxidation of quinaldine red, a cationic dye, using hydrogen peroxide has been studied in aqueous solution. The rate of reaction was found to be first order in [quinaldine red] whereas in hydrogen peroxide it varies from one to zero with increasing [H2O2]. The rate of reaction increases with increasing pH as well as with the addition of sodium carbonate. The reaction rate attains a limiting value at higher carbonate concentrations which is attributed to the maximum formation of peroxide anions. The rate of hydrogen peroxide decomposition in the presence of sodium carbonate is much greater than that of bleaching of the dye under the same conditions. Moreover, the rate of reaction decreases with increasing ionic strength suggesting an interaction between two singly oppositely charged ions in the activated complex. A plausible reaction mechanism is proposed with a rate equation that is in agreement with the experimental data.
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Artikel in diesem Heft
- Determination of the Branching Ratios of CaBr(A2Π1/2,3/2, B2Σ+) Resulting from the Reaction of Ca[4s4p (3PJ)] with CH3Br by Time-Resolved Atomic Emission and Molecular Chemiluminescence Following Pulsed Dye-Laser Excitation of Atomic Calcium
- Densities, Apparent Molar Volumes, and Interaction Parameters for the Monosaccharide (D-Xylose, D-Arabinose, D-Glucose, D-Galactose)–NaBr–Water Systems at 298.15 K
- Oscillatory Reaction of Bromate-Gallic acid. A Calorimetric and Electrometric Study in Aquo-Organic Solvent Media
- Adsorption Properties of Silica towards Poly(Ethylene Oxide) as a Function of pH Studied by Spin-Labelling
- Thermodynamic of Transfer and Preferential Solvation of Antibiotic Cephradine in 1,4-Dioxane-Water Mixtures
- Kinetics and Mechanism of the Homogeneous Oxidation of Quinaldine Red by Hydrogen Peroxide
- Interactions in Sphere Packings
- Book Reviews
