Studies of Stability and Reactivity of Synthetic Cryptomelane-like Manganese Oxide Octahedral Molecular Sieves

Ye, Yin; Xu, Wenqing; DeGuzman, Roberto N.; Suib, Steven L.; O’Young, Chi-Lin

doi:10.1021/ic00097a029

Cited by 80 publications

(54 citation statements)

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“…Cryptomelane and todorokite were constructed by covalent-bond linked MnO 6 octahedral chains (Post, 1992) and are more stable and exhibit weaker activity on Cr(III) oxidation than birnessite . Compared with todorokite, weakly crystallized cryptomelane possessed more growth defects in its crystal lattice, higher surface area and greater amount of active oxygen in its tunnel structure (Yin et al, 1994). These may account for its stronger oxidization of Cr(III) than todorokite.…”

Section: Cr(iii) Oxidization By the Synthesized Mn Oxide Mineralsmentioning

confidence: 99%

Adsorption and redox reactions of heavy metals on synthesized Mn oxide minerals

Feng

Zhai

Tan

et al. 2007

Environmental Pollution

263

139

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Section: Cr(iii) Oxidization By the Synthesized Mn Oxide Mineralsmentioning

confidence: 99%

Adsorption and redox reactions of heavy metals on synthesized Mn oxide minerals

Feng

Zhai

Tan

et al. 2007

Environmental Pollution

263

139

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“…[224,225] A small concentration of manganese vacancies is often observed, and a limited amount of manganese substitution is also possible. The water of hydration can be removed at temperatures up to about 500 8C, to yield nanoporous materials that will adsorb small organic molecules such as cyclohexane.…”

Section: Reviewsmentioning

confidence: 99%

Open-Framework Inorganic Materials

Cheetham

Férey

Loiseau

1999

Angew. Chem. Int. Ed.

2,369

420

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Aluminosilicate zeolites such as UTD-1 (structure shown) belong to a family of nanoporous inorganic materials that find utility in catalysis, separation, and ion exchange. During the last decade, the rate of discovery of new open-framework materials based, for example, on phosphates, sulfides, halides, nitrides, and coordination compounds has increased dramatically. The synthesis, structures, and properties of this remarkable class of materials are reviewed.

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“…Due to the various oxidation states of Mn element, manganese oxides (␣-MnO 2 , ␤-MnO 2 and ␥-MnO 2 ) have wide application in many fields [18,19]. Birnessitetype manganese oxide is an octahedral layer (OL) material with cations and water in the interlayer space of negatively charged layers of edge-sharing MnO 6 octahedral containing mixed valence states of Mn (Mn 4+ , Mn 3+ , Mn 2+ ions) and oxygen vacancies [20,21]. This material has been applied for the adsorption of heavy metal cations [22], catalytic oxidation of alcohols/CO [23] and decomposition of the organic sulfur compounds [24].…”

Section: Introductionmentioning

confidence: 99%

Decolorization of methylene blue in layered manganese oxide suspension with H2O2

Zhang

Nie

et al. 2011

Journal of Hazardous Materials

122

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a b s t r a c tLayered birnessite-type manganese oxides (Na-OL-1) were prepared via a redox reaction involving MnO 4 − and Mn 2+ under markedly alkaline conditions. According to the XRD analysis, the resulting material exhibited a well-crystallized octahedral layer (OL) structure with several different phases, including ␤-MnOOH, ␣-MnOOH and ␥-Mn 3 O 4 . The catalyst was highly effective for the decolorization and degradation of methylene blue (MB) in the presence of H 2 O 2 at neutral pH. The tested MB was completely decolorized in Na-OL-1 suspension by the fraction dosing of H 2 O 2 (556.5 mM at the beginning and then 183.8 mM at 40 min). Based on the studies of electron spin resonance and the effect of radical scavengers, the 1 O 2 and O 2 •− were the main reactive oxygen species (ROS) in the reaction. It was found that both oxygen and ROS were generated from the decomposition of H 2 O 2 in Na-OL-1 suspension, wherein the decomposition pathways were proposed. The generation of H 2 O 2 in Na-OL-1 suspension at air atmosphere indicated that the existence of multivalent manganese oxides greatly enhanced the interfacial electron transfer, leading to the high activity of Na-OL-1.

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Studies of Stability and Reactivity of Synthetic Cryptomelane-like Manganese Oxide Octahedral Molecular Sieves

Cited by 80 publications

References 0 publications

Adsorption and redox reactions of heavy metals on synthesized Mn oxide minerals

Adsorption and redox reactions of heavy metals on synthesized Mn oxide minerals

Open-Framework Inorganic Materials

Decolorization of methylene blue in layered manganese oxide suspension with H2O2

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