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

Sriskandakumar  T; Opembe  N; Chen  CHMorey  AKingondu  CSuib  SL

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

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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.

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《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |2009年第8期|1523-1530|共8页
作者
Sriskandakumar T; Opembe N; Chen CHMorey AKingondu CSuib SL;
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作者单位

[Sriskandakumar, T;

Opembe, N;

Chen, CHMorey, AKing'ondu, CSuib, SL] Univ Connecticut, Dept Chem, Storrs, CT 06269 USA;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
关键词
METHYLENE-BLUE; CATIONIC DYES; OXIDATION; CRYPTOMELANE; NANOMATERIALS; ADSORPTION; MECHANISM; KINETICS; WATER; H2O2;

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

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