Silver(I) Catalyzed Photochemical Oxidation of Methylene Blue and Safranine-O by Peroxydisulphate: A Green Chemical Approach

Chhajed, Ravisha; Sharma, Smriti; Ameta, Rakshit; Punjabi, Pinki B.

doi:10.1155/2014/232475

Cited by 4 publications

(1 citation statement)

References 23 publications

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“…The kinetics of the oxidation of [MB] + (this work), tartrazine 12 and, safranin‐O 24 by persulfate in the presence of Ag + as a catalyst under the same conditions have now been studied. These reactions are enhanced in the acid medium and the electron transfer process takes place via a one‐electron radical mechanism through an outer‐sphere mechanism.…”

Section: Resultsmentioning

confidence: 99%

Kinetic studies on the persulfate oxidation of methylene blue in the absence and presence of silver(I) as a catalyst in aqueous and micellar media

Ewais

Angari

2023

Int J of Chemical Kinetics

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The kinetics and mechanism of the oxidative decolorization of methylene blue (MB + ) as a cationic dye by persulfate using silver(I) catalyst in aqueous acidic medium were studied. The effects of different parameters like [H + ], [Ag + ], reactant concentration, micelles, and temperatures were investigated. The kinetic data showed that the oxidative decolorization of [MB] + by persulfate obeyed pseudo-first-order kinetics by taking a large excess of [S 2 O 8 2− ] over [MB + ]. The observed rate constant increases with increasing of [H + ]. A plausible mechanism for the silver(I) enhanced decolorization of [MB] + by persulfate is suggested which is consistent with the experimental rate law. The effect of micelles such as SDS and Triton X-100 on the reaction rate is investigated. The rate of reaction decreases with increasing [SDS] but is not affected by Triton X-100. The mechanism of the electron transfer process between [MB] + and S 2 O 8 2proceeds through an outer-sphere mechanism. Thermodynamic activation parameters ΔH* and ΔS* were calculated. The experimental data may be useful for the layout of wastewater treatment containing various types of dyes.

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Section: Resultsmentioning

confidence: 99%