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Oxidative Decolorization of Brilliant Cresyl Blue Dye by Persulfate in the Presence of Cobalt(II) As a Catalyst in Aqueous and Micellar Media: A Kinetic Study

  • CHEMICAL KINETICS AND CATALYSIS
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Abstract

The kinetics of oxidative decolorization of brilliant cresyl blue dye (BCB)+ by persulfate in the presence of cobalt(II) as a catalyst were investigated in aqueous acidic medium. The effects of different parameters like [H+], [BCB+], [\({{\operatorname{S} }_{2}}\text{O}_{8}^{{2 - }}\)], [Co(II)], [organic ligands], [micelles], and temperatures were studied. The reaction between [BCB]+ and persulfate was studied under pseudo-first-order kinetics by using a large excess of [\({{\operatorname{S} }_{2}}\text{O}_{8}^{{2 - }}\)] over [BCB+]. The effect of cobalt(II) as catalyst on the rate of reaction at different temperatures was investigated. A plausible mechanism for the cobalt(II) enhanced decolorization of [BCB]+ by persulfate is suggested. The surfactant sodium dodecyl sulfate was found to inhibate the reaction rate, whereas Triton X-100 had no effect. The effect of organic ligands like malonic acid, 1,10-phenanthroline, oxalic acid and EDTA was investigated and it was found that these compounds enhanced the reaction rate. An outer-sphere electron transfer process is the proposed mechanism for this reaction.

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ACKNOWLEDGMENTS

This Project was funded by the Deanship of Scientific Research (DSR) at King Abdulaziz University, Jeddah, under grant no. G: 212-247-1439. The authors, therefore, acknowledge with thanks DSR for technical and financial support.

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  1. Chemistry Department, Faculty of Science, King Abdulaziz University, P.O Box 80203, 21589, Jeddah, Saudi Arabia

    A. S. Basaleh & H. A. Ewais

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  1. A. S. Basaleh
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  2. H. A. Ewais
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Correspondence to H. A. Ewais.

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Basaleh, A.S., Ewais, H.A. Oxidative Decolorization of Brilliant Cresyl Blue Dye by Persulfate in the Presence of Cobalt(II) As a Catalyst in Aqueous and Micellar Media: A Kinetic Study. Russ. J. Phys. Chem. 95 (Suppl 2), S222–S229 (2021). https://doi.org/10.1134/S0036024421150048

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