Kinetic and thermodynamic studies of fenton oxidative decolorization of methylene blue

Abdur Rahim A. Giwa, Isah A. Bello, Abdullahi B. Olabintan, Olugbenga S. Bello, Tawfik A. Saleh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

The need for light intensity has made dye degradation very costly for industry. In this work, Fenton reagent was used for the efficient degradation of an aqueous solution of dye without the need for a light source. The influences of the pH of the media, the initial concentrations of Fe2+, H2O2, and methylene blue (MB) dye; in addition to temperature on the oxidation of MB dye were studied. The optimum amounts of the Fenton reagent were 4mM of Fe2+ and 70mM of H2O2 at 20 mg/L of dye. The optimum ratio of 0.05 of Fe2+/H2O2 was found to give the best result for the decolorization of dye. The Fenton process was effective at pH 3 with a maximum dye decolorization efficiency of 98.8% within 30 min of reaction, corresponding to a COD removal of 85%. The decolorization process was thermodynamically feasible, spontaneous, and endothermic. The activation energy (Ea) was 33.6 kJ/mol suggesting that the degradation reaction proceeded with a low energy barrier.

Original languageEnglish
Article numbere04454
JournalHeliyon
Volume6
Issue number8
DOIs
StatePublished - Aug 2020

Bibliographical note

Publisher Copyright:
© 2020

Keywords

  • Dye
  • Fenton's reagent
  • Interactions
  • Kinetics
  • Physical chemistry
  • Thermodynamic

ASJC Scopus subject areas

  • General

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