Abstract
The oxidation of methylene blue (MB+) by cerium(IV) was studied in 0.1–5 M H2SO4. The reaction proceeds via MB radical (MB2+•) formed by one electron transfer to the oxidant. The radical is observed spectrophotometrically by a very intense absorbance at λmax = 526 nm and by the e.p.r signal at g = 2.000. The kinetics of the fast radical formation are two orders of magnitude slower than its decomposition, which were examined using a stopped-flow method at 298 K under pseudo-first order conditions. The rate laws for the both steps were determined and a likely mechanism reported.
Similar content being viewed by others
References
Quintăo A.D., Coutinho K. and Canuto S. (2002). Int. J. Quantum Chem 90: 634 and references therein
Gabrielli D., Belisle E., Severino D., Kowaltowski A.J. and Baptista M.S. (2004). Photochem. Photobiol. 79: 227
Wainwright M. (2003). Int. J. Antimicrob. Agents 21: 510
Floyd R.A., Schneider J.E. and Dittmer D.P. (2004). Antivir. Res. 61: 141
Celikoz B., Deveci M. and Nisanci A. (1999). Ann. Burns Fire Disasters 12: 217
LeClaire A.C., Mullett T.W., Jahania M.S. and Flynn J.D. (2005). Ann. Pharmacother. 39: 373
R.T. Parry, Principles and Applications of Modified Atmosphere Packaging of Foods, Blackie Academic Press, R.T. Parry (ed.), London, 1993.
H.E. Smolander and R. Ahvenainen, Trends Food Sci. Technol., 101 (1997).
Bauldreay J.M. and Archer M.D. (1983). Electrochim. Acta 28: 1515
Takizawa T., Watanabe T. and Honda K. (1978). J. Phys. Chem. 82: 1391
Kamat P.V. and Lichtin N.N. (1982). J. Photochem. 18: 197
Mills A. and Wang J. (1999). J. Photochem. Photobiol. A: Chem 127: 123 and the references therein
Katafias A. (2006). Transition Met. Chem 31: 907
Pietkiewicz-Graczyk A., Impert O., Katafias A. and Kita P. (2003). Polish J. Chem. 77: 475
Lewis G.N. and Bigeleisen J. (1943). J. Am. Chem. Soc. 65: 1144
Paul M.A. and Long F.A. (1957). Chem. Rev. 57: 1
Spencer W. and Sutter J.R. (1979). J. Phys. Chem. 83: 1573
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Katafias, A., Kita, P., Wrzeszcz, G. et al. Kinetics of the methylene blue oxidation by cerium(IV) in sulphuric acid solutions. Transition Met Chem 32, 31–37 (2007). https://doi.org/10.1007/s11243-006-0120-3
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11243-006-0120-3