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Vol.1 , No. 4, Publication Date: Jan. 4, 2017, Page: 20-26
 Oxidation of Cadaverine in Different Acidic Media: A Comparative Kinetic Study&description=Kinetics of oxidation of cadaverine by chromium(VI) in aqueous perchloric and sulfuric acids media has been investigated spectrophotometrically at fixed ionic strength and temperature. In both acids the reactions showed a first order dependence on [Cr(VI)], less than unit order dependence with respect to cadaverine concentration. The effect of hydrogen ion concentration on the oxidation rates showed that the oxidation reactions in both acids were acid-catalyzed with fractional-second order dependences with respect to [H<sup>+</sup>]. The oxidation rates were not affected significantly by variation of ionic strength or dielectric constant of the reactions media. Addition of Mn(II) was found to decrease the oxidation rates. In both acids, the final oxidation products of cadaverine were identified as 5-aminopentanal and ammonia. Under comparable experimental conditions, the oxidation rate of cadaverine in sulfuric acid was found to be higher than that in perchloric acid. The plausible oxidation mechanism were proposed and the rate-law expression was derived. The activation parameters with respect to the second order rate constants were evaluated.&picture=http://www.aascit.org/aascit/decorators/img/journal/832.jpg)
| [1] | Fawzy A., Chemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia; Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt. |
| [2] | Zaafarany I. A., Chemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia. |
| [3] | Abdallah M., Chemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia; Chemistry Department, Faculty of Science, Benha University, Benha, Egypt. |
| [4] | Bawazeer T. M., Chemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia. |
| [5] | Jassas R. S., Chemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia. |
| [6] | Obaid R. J., Chemistry Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia. |
Kinetics of oxidation of cadaverine by chromium(VI) in aqueous perchloric and sulfuric acids media has been investigated spectrophotometrically at fixed ionic strength and temperature. In both acids the reactions showed a first order dependence on [Cr(VI)], less than unit order dependence with respect to cadaverine concentration. The effect of hydrogen ion concentration on the oxidation rates showed that the oxidation reactions in both acids were acid-catalyzed with fractional-second order dependences with respect to [H+]. The oxidation rates were not affected significantly by variation of ionic strength or dielectric constant of the reactions media. Addition of Mn(II) was found to decrease the oxidation rates. In both acids, the final oxidation products of cadaverine were identified as 5-aminopentanal and ammonia. Under comparable experimental conditions, the oxidation rate of cadaverine in sulfuric acid was found to be higher than that in perchloric acid. The plausible oxidation mechanism were proposed and the rate-law expression was derived. The activation parameters with respect to the second order rate constants were evaluated.
Keywords
Cadaverine, Chromium(VI), Oxidation, Kinetics, Mechanism
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