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

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

doi:10.1007/s11243-006-0120-3

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

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

Pure And Applied Chemistry

Research output: Contribution to journal › Article › peer-review

22 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 language	English
Pages (from-to)	31-37
Number of pages	6
Journal	Transition Metal Chemistry
Volume	32
Issue number	1
DOIs	https://doi.org/10.1007/s11243-006-0120-3
Publication status	Published - Feb 2007

Keywords

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

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10.1007/s11243-006-0120-3

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title = "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.",

keywords = "methylene blue oxidation, cerium, protolytic equilibria, protolytic equilibrium, electron transfer, redox reactions, oxidation",

author = "A. Katafias and P. Kita and G. Wrzeszcz and A. Mills",

year = "2007",

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doi = "10.1007/s11243-006-0120-3",

language = "English",

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T1 - Kinetics of the methylene blue oxidation by cerium(iv) in sulphuric acid solutions

AU - Katafias, A.

AU - Kita, P.

AU - Wrzeszcz, G.

AU - Mills, A.

PY - 2007/2

Y1 - 2007/2

N2 - 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.

AB - 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.

KW - methylene blue oxidation

KW - cerium

KW - protolytic equilibria

KW - protolytic equilibrium

KW - electron transfer

KW - redox reactions

KW - oxidation

UR - http://dx.doi.org/10.1007/s11243-006-0120-3

U2 - 10.1007/s11243-006-0120-3

DO - 10.1007/s11243-006-0120-3

M3 - Article

SN - 0340-4285

VL - 32

SP - 31

EP - 37

JO - Transition Metal Chemistry

JF - Transition Metal Chemistry

IS - 1

ER -

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

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Keywords

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