Framework Doping of Indium in Manganese Oxide Materials: Synthesis, Characterization, and Electrocatalytic Reduction of Oxygen

Liu, Zhenxin; Xing, Yu; Chen, Chun‐Hu; Zhao, Linlin; Suib, Steven L.

doi:10.1021/cm703553p

Cited by 59 publications

(57 citation statements)

References 18 publications

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“…The OMS‐2 powder feedstock was prepared following the general method of OMS‐2 nanowires . Typically, K 2 SO 4 (9.6 mmol), K 2 S 2 O 8 (9.6 mmol), and MnSO 4 ⋅ H 2 O (6.4 mmol) were dissolved in 56 mL deionized water under vigorous stirring for 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…The OMS-2 powder feedstock was prepared following the general method of OMS-2 nanowires. [13,18] Typically,K 2 SO 4 (9.6 mmol), K 2 S 2 O 8 (9.6 mmol), and MnSO 4 •H 2 O( 6.4 mmol) were dissolved in 56 mL deionized water under vigorous stirring for 30 min. The mixture was then autoclaved in as pecial Te flon-lined stainless steel reactor at 250 8Cf or 4d ays.…”

Section: Experimental Section Preparation Of Oms-2 Powderfeedstockmentioning

confidence: 99%

“…Manganese oxide octahedral molecular sieves (OMS) have been widely investigated in catalysis, batteries, separations, chemical sensors,a nd other applications. [13] Cryptomelane is am icroporous manganese oxide with ac omposition of KMn 8 O 16 •n H 2 O. Synthetic cryptomelane octahedral molecular sieve (OMS-2) hasa2 2t unnel structure as a result of the arrangement of MnO 6 octahedra,w hich are edge and corners hared.…”

Section: Introductionmentioning

confidence: 99%

“…Manganese oxide structures can form mixed‐valent octahedral molecular sieves (OMS). Manganese oxide octahedral molecular sieves (OMS) have been widely investigated in catalysis, batteries, separations, chemical sensors, and other applications . Cryptomelane is a microporous manganese oxide with a composition of KMn 8 O 16 ⋅ n H 2 O.…”

Section: Introductionmentioning

confidence: 99%

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Robust Macroscopic 3D Sponges of Manganese Oxide Molecular Sieves

Liu

Guo

et al. 2017

Chemistry A European J

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The construction of macroscopic 3D sponges is of great technological importance for various applications. An outstanding challenge is the facile fabrication of sponges with the desirable combination of good stability, high electrical conductivity, and absorption ability. Here free-standing 3D OMS-2 sponges are demonstrated, with various densities, which possess a combination of desirable physical properties including high porosity, robustness, permeability, recyclability, high electrical conductivity, and selective water absorption in preference to oil. Some of these properties have systematic trends with various densities. The stress of the OMS-2 sponge, made by nanowire-based freeze-drying process, is four orders of magnitude higher than that made by calcination-related process. These new materials should find practical applications in environmental, catalysis, sensing, absorption, and energy storage, particularly in the removal of water spill cleanup, and beyond.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Section Preparation Of Oms-2 Powderfeedstockmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Robust Macroscopic 3D Sponges of Manganese Oxide Molecular Sieves

Liu

Guo

et al. 2017

Chemistry A European J

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“…Manganese dioxides (MnO 2 ) have attracted intensive interests because of their low cost, environmental compatibility and abundant availability. [19][20][21] Due to the existing unique layers or tunnels in lattices and high specific surface areas, manganese dioxides have been widely investigated and extensively used in adsorption processes. [22][23][24] In addition, the modification of other adsorbents with MnO 2 would actually improve their adsorption properties.…”

Section: Introductionmentioning

confidence: 99%

MnO_x-modified ZnAl-LDOs as high-performance adsorbent for the removal of methyl orange

et al. 2014

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MnO(x) modified ZnAl layered double oxides (M-LDO) nanocomposites were prepared through an intercalation/reduction/calcination process. The morphology and crystal structure of M-LDO were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), Thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR) analysis methods. The results confirmed that the manganese oxide nanoparticles were well distributed on the LDO support. Methyl orange (MO) was chosen as a common water-soluble azo dye probe to evaluate the adsorption performance of M-LDO. The effects of MO initial concentration, agitation time, and temperature on MO adsorption were investigated. It was found that adsorption equilibrium data were best represented by the Langmuir and Redlich-Peterson isotherms and the maximum adsorption capacity was 617.28 mg g(-1) obtained from the Langmuir isotherm, which was much larger than some reported adsorbents. Besides, the adsorption process was spontaneous and endothermic in nature and followed a pseudo-second-order kinetic model. The mechanism of the adsorption process was elaborated by an intraparticle diffusion model. Moreover, the regeneration test of M-LDO was carried out and it showed that the used M-LDO was feasible for at least five times. In principle, this adsorbent with a high adsorption capacity and great reutilization performance could be a very promising adsorbent for wastewater treatment.

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Manganese Oxide Octahedral Molecular Sieves (OMS-2) Multiple Framework Substitutions: A New Route to OMS-2 Particle Size and Morphology Control

et al. 2010

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Self-assembled multidoped cryptomelane hollow microspheres with ultrafi ne particles in the size range of 4-6 nm, and with a very high surface area of 380 m 2 g − 1 have been synthesized. The particle size, morphology, and the surface area of these materials are readily controlled via multiple framework substitutions. The X-ray diffraction and transmission electron microscopy (TEM) results indicate that the as-synthesized multidoped OMS-2 materials are pristine and crystalline, with no segregated metal oxide impurities. These results are corroborated by infrared (IR) and Raman spectroscopy data, which show no segregated amorphous and/or crystalline metal impurities. The fi eld-emission scanning electron microscopy (FESEM) studies confi rm the homogeneous morphology consisting of microspheres that are hollow and constructed by the self-assembly of pseudo-fl akes, whereas energy-dispersive X-ray (EDX) analyses imply that all four metal cations are incorporated into the OMS-2 structure. On the other hand, thermogravimetric analyses (TGA) and differential scanning calorimetry (DSC) demonstrate that the as-synthesized multidoped OMS-2 hollow microspheres are more thermally unstable than their single-doped and undoped counterparts. However, the in-situ XRD studies show that the cryptomelane phase of the multidoped OMS-2 hollow microspheres is stable up to about 450 ° C in air. The catalytic activity of these microspheres towards the oxidation of diphenylmethanol is excellent compared to that of undoped OMS-2 materials.

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Framework Doping of Indium in Manganese Oxide Materials: Synthesis, Characterization, and Electrocatalytic Reduction of Oxygen

Cited by 59 publications

References 18 publications

Robust Macroscopic 3D Sponges of Manganese Oxide Molecular Sieves

Robust Macroscopic 3D Sponges of Manganese Oxide Molecular Sieves

MnO_x-modified ZnAl-LDOs as high-performance adsorbent for the removal of methyl orange

Manganese Oxide Octahedral Molecular Sieves (OMS-2) Multiple Framework Substitutions: A New Route to OMS-2 Particle Size and Morphology Control

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Framework Doping of Indium in Manganese Oxide Materials: Synthesis, Characterization, and Electrocatalytic Reduction of Oxygen

Cited by 59 publications

References 18 publications

Robust Macroscopic 3D Sponges of Manganese Oxide Molecular Sieves

Robust Macroscopic 3D Sponges of Manganese Oxide Molecular Sieves

MnOx-modified ZnAl-LDOs as high-performance adsorbent for the removal of methyl orange

Manganese Oxide Octahedral Molecular Sieves (OMS-2) Multiple Framework Substitutions: A New Route to OMS-2 Particle Size and Morphology Control

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MnO_x-modified ZnAl-LDOs as high-performance adsorbent for the removal of methyl orange