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

86 Citations (Scopus)

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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