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Green Decomposition of Organic Dyes Using Octahedral Molecular Sieve Manganese Oxide Catalysts.
- Source :
-
Journal of Physical Chemistry A . Feb2009, Vol. 113 Issue 8, p1523-1530. 8p. - Publication Year :
- 2009
-
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 H2O2does 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10895639
- Volume :
- 113
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Journal of Physical Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 36625220
- Full Text :
- https://doi.org/10.1021/jp807631w