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Kinetics of the methylene blue oxidation by cerium(IV) in sulphuric acid solutions

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.

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Correspondence to A. Katafias.

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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

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Keywords

  • Cerium
  • Methylene Blue
  • Order Rate Constant
  • Sulphuric Acid Solution
  • Encounter Complex