alexa Kinetics and Mechanism of Oxidation of Vanillin by Chro
ISSN: 2329-6798

Modern Chemistry & Applications
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Research Article

Kinetics and Mechanism of Oxidation of Vanillin by Chromium(VI) in Sulfuric Acid Medium

Ahmed Fawzy1,2*, Ishaq Zaafarany1, Khalid Khairou1, Ismail Althagafi1 and Jabir Alfahemi1

1Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, 21955 Makkah, Saudi Arabia

2Chemistry Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt

Corresponding Author:
Ahmed Fawzy
Associate Professor, Chemistry Department
Faculty of Applied Science, Umm Al-Qura
University, 21955 Makkah, Saudi Arabia
Tel: 966-590-994-316
Fax: 006-991-255-511-07

Received date: March 30, 2016; Accepted date: April 29, 2016; Published date: May 04, 2016

Citation: Fawzy A, Zaafarany I, Khairou K, Althagafi I, Alfahemi J (2016) Kinetics and Mechanism of Oxidation of Vanillin by Chromium(VI) in Sulfuric Acid Medium. Mod Chem appl 4:179. doi:10.4172/2329-6798.1000179

Copyright: © 2016 Fawzy A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.



The kinetics of oxidation of vanillin (VAN) by chromium(VI) in sulfuric acid medium was studied by a spectrophotometric technique. The reaction exhibited a first order dependence with respect to [Cr(VI)] and fractionalfirst orders with respect to [VAN] and [H+]. Varying ionic strength or dielectric constant of the reaction medium had no significant effect on the oxidation rate. The proposed mechanism includes an intermediate complex formation between vanillin and chromium(VI) before the rate-determining step. The final oxidation product of vanillin was identified by both spectral and chemical analysis as vanillic acid. The suitable rate law has been deduced. The reaction constants included in the various steps of the suggested mechanism have been evaluated. The activation parameters of the rate constant of the rate-determining step of the mechanism and the thermodynamic quantities of the equilibrium constant have been evaluated and discussed.


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