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

A. Katafias, P. Kita, G. Wrzeszcz, A. Mills

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10 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)31-37
Number of pages6
JournalTransition Metal Chemistry
Volume32
Issue number1
DOIs
Publication statusPublished - Feb 2007

Keywords

  • methylene blue oxidation
  • cerium
  • protolytic equilibria
  • protolytic equilibrium
  • electron transfer
  • redox reactions
  • oxidation

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