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Oxidative decolorization of Mordant Black 17 by peroxydisulfate facilitated by Fe2+

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Title Oxidative decolorization of Mordant Black 17 by peroxydisulfate facilitated by Fe2+
 
Creator Srivastava, Abhishek
Srivastava, Neetu
Singh, Ruchi
 
Subject Peroxydisulfate
Mordant Black17
Decolorization
Kinetics
Activation parameters
 
Description 325-331
The present study focuses on investigating the decolorization of Mordant Black17 (MB17) in aqueous solutions using
peroxydisulfate. The impact of the initial dye concentration, as well as the concentrations of peroxydisulfate and Fe2+,
temperature, and pH on the decolorization of MB17 has been investigated. The experimental data have been examined
employing kinetics of both first and second order. The decolorization kinetics of MB17 in the peroxydisulfate process
adhered to the principles of second-order reaction kinetics, with a rate constant of 2.75×10-4 M-1 min-1 at 3.0 mM S2O8
2-
concentration. Decolorization efficiency above 93% has been achieved in 120 minutes under optimal reaction conditions.
The rate constants pertaining to the second-order chemical process demonstrate a positive association with both S2O8
2–
concentration and temperature. Fe2+ activates S2O8
2– to generate sulfate radical ion, amplifying MB17 decolorization. At
higher pH, sulfate-free radical production decreases, limiting MB17 decolorization. Peroxydisulfate decolorized MB17 with
a low activation energy of 45.36 kJ mol–1 at 3.0 mM starting concentration. The positive ΔG value indicates the nonspontaneity
of the decolorization process.
 
Date 2024-03-19T11:03:49Z
2024-03-19T11:03:49Z
2024-03
 
Type Article
 
Identifier 2583-1321 (Online); 0019-5103 (Print)
http://nopr.niscpr.res.in/handle/123456789/63588
https://doi.org/10.56042/ijc.v63i3.6996
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJC Vol.63(03) [March 2024]