Kinetic analysis of catalytic oxidation of methylene blue over γ-Al2O3 supported copper nanoparticles

Matumuene Joe Ndolomingo, Reinout Meijboom

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

The kinetics of the catalytic oxidation of methylene blue, with hydrogen peroxide was studied under mild conditions. Several copper catalysts were evaluated, with Cu/Li2O/γ-Al2O3 being the most active catalyst. Atomic absorption spectroscopy (AAS), X-ray diffraction spectroscopy (XRD), ligand based chemisorption (LBC), physisorption (BET), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were used for the characterization of the catalysts, while the oxidative degradations of methylene blue were followed by ultraviolet-visible spectroscopy (UV-vis). Different intermediate species were detected by gas chromatography-mass spectrometry (GC-MS), and the degradation pathway was proposed. The kinetic data obtained could be modeled to the Langmuir-Hinshelwood model; that is both reactants are adsorbed onto the surface of the nanoparticles. The apparent reaction rate could therefore be related to the surface S of the nanoparticles, to the constant k, related to the rate determining steps, and to the adsorption constant KMB and KH2O2 of methylene blue and hydrogen peroxide, respectively.

Original languageEnglish
Pages (from-to)33-43
Number of pages11
JournalApplied Catalysis A: General
Volume506
DOIs
Publication statusPublished - 5 Oct 2015

Keywords

  • Catalytic oxidation
  • Kinetics
  • Methylene blue
  • Nanoparticles

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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