Abstract : Delta-MnO(2) coatings on clay substrates tend to be poorer in crystallinity as compared with their
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Abstract : Delta-MnO(2) coatings on clay substrates tend to be poorer in crystallinity as compared with their discrete counterparts which may be of environmental significance for adsorption and oxidation of contaminants. Discrete delta-MnO(2) particles and three delta-MnO(2)-coated montmorillonite complexes with varying MnO(2) loadings (4.8-34.9) were synthesized and oxidative decolorization of methylene blue (MB) by the synthetic materials was investigated in batch systems. Results showed that oxidative decolorization of MB increased with increasing loading of Mn-oxide coatings whereas oxidation capacity of the coatings on the basis of unit mass of MnO(2) tended to decrease. Initial reaction rate of MB oxidation by both delta-MnO(2) coatings and their discrete counterpart increased linearly with increasing Mn-oxide loadings but the rate of the former was higher than that of the latter. An increase in humic acid concentration displayed a progressively enhanced promotive effect on MB decolorization whereas the promotive effect was greatly suppressed at lower pH.Copyright 2010 Elsevier B.V. All rights reserved.PMID 20510506 PubMed - indexed for MEDLINEPublication Types MeSH Terms SubstancesPublication Types Research Support Non-U.S. GovtMeSH TermsAdsorptionBentonite/chemistry*ColorEnvironmental Pollution/prevention amp controlEnvironmental Remediation/methods*Humic SubstancesHydrogen-Ion ConcentrationManganese Compounds/chemistry*Methylene Blue/chemistry*Oxidation-ReductionOxides/chemistry*SubstancesHumic SubstancesManganese CompoundsOxidesBentonitemanganese dioxideMethylene BlueLinkOut - more resourcesFull Text SourcesElsevier ScienceEBSCOOhioLINK Electronic Journal CenterSwets Information ServicesMolecular Biology DatabasesMANGANOUS OXIDE - HSDBMANGANESE COMPOUNDS - HSDBMETHYLENE BLUE - HSDBBENTONITE - HSDB Supplemental Content Related citations Oxidative decolorization of methylene blue using pelagite. J Hazard Mater. 2008 Oxidative decolorization of methylene blue using pelagite.Zhu MX Wang Z Zhou LY. J Hazard Mater. 2008 Jan 15 150(1)37-45. Epub 2007 Apr 20. 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Decolorization of methylene blue by delta-MnO2-coated montmorillonite complexes emphasizing redox reactivity of Mn-oxide coatings.J Hazard Mater. 2010 Sep 15 181(1-3)57-64. Epub 2010 Apr 24 . PubMed Your browsing activity is empty. Activity recording is turned off. Turn recording back on See more... 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