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A kinetic approach for the mechanism of malachite green‐peroxydisulphate reaction in aqueous solution
Author(s) -
Mushinga T.,
Jonnalagadda S. B.
Publication year - 1992
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550240106
Subject(s) - chemistry , malachite green , aqueous solution , kinetic energy , mechanism (biology) , reaction mechanism , photochemistry , inorganic chemistry , catalysis , organic chemistry , adsorption , physics , quantum mechanics , philosophy , epistemology
The oxidation kinetics of malachite green (MG) with peroxydisulphate ion (PDS) were investigated by monitoring the absorbance change at 618 nm, in aqueous solutions under buffered and unbuffered conditions. Under both conditions, the reaction had first order dependence on reductant and a fractional order (one half) dependence on the oxidant. The stoichiometric ratio between MG and PDS was 1:2. The reaction had a negative salt effect. Reaction rates were enhanced under both high or low pH relative to neutral conditions. A plausible mechanism is proposed.