Green Decomposition of Organic Dyes Using Octahedral Molecular Sieve Manganese Oxide Catalysts

Thamayanthy Sriskandakumar, Naftali N. Opembe, Chun-Hu Chen, Aimee Morey, Cecil K. King'ondu, Steven L. Suib

Research output: Contribution to journalArticle

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Abstract

The catalytic degradation of organic dye (methylene blue, MB) has been studied using green oxidation methods (tertiary-butyl hydrogen peroxide, TBHP, as the oxidant with several doped mixed-valent and regular manganese oxide catalysts in water) at room and higher temperatures. These catalysts belong to a class of porous manganese oxides known as octahedral molecular sieves (OMS). The most active catalysts were those of Mo6+- and V5+-doped OMS. Rates of reaction were found to be first-order with respect to the dye. TBHP has been found to enhance the MB decomposition, whereas H2O2 does not. Reactions were studied at pH 3−11. The optimum pH for these reactions was pH 3. Dye-decomposing activity was proportional to the amount of catalyst used, and a significant increase in catalytic activity was observed with increasing temperature. X-ray diffraction (XRD), energy dispersive spectroscopy (EDX), and thermogravimetric analysis (TGA) studies showed that no changes in the catalyst structure occurred after the dye-degradation reaction. The products as analyzed by electrospray ionization mass spectrometry (ESI-MS) showed that MB was successively decomposed through different intermediate species.
Original languageEnglish
Pages (from-to)1523-1530
JournalJournal of Physical Chemistry A
Volume113
DOIs
Publication statusPublished - 2009

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manganese oxides
Molecular sieves
absorbents
Coloring Agents
dyes
Methylene Blue
Decomposition
methylene blue
decomposition
catalysts
Catalysts
Energy dispersive spectroscopy
degradation
Degradation
Electrospray ionization
hydrogen peroxide
Oxidants
Hydrogen Peroxide
Mass spectrometry
Thermogravimetric analysis

Cite this

Sriskandakumar, Thamayanthy ; Opembe, Naftali N. ; Chen, Chun-Hu ; Morey, Aimee ; King'ondu, Cecil K. ; Suib, Steven L. / Green Decomposition of Organic Dyes Using Octahedral Molecular Sieve Manganese Oxide Catalysts. In: Journal of Physical Chemistry A. 2009 ; Vol. 113. pp. 1523-1530.
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Green Decomposition of Organic Dyes Using Octahedral Molecular Sieve Manganese Oxide Catalysts. / Sriskandakumar, Thamayanthy; Opembe, Naftali N.; Chen, Chun-Hu; Morey, Aimee; King'ondu, Cecil K.; Suib, Steven L.

In: Journal of Physical Chemistry A, Vol. 113, 2009, p. 1523-1530.

Research output: Contribution to journalArticle

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