Size-controlled synthesis and formation mechanism of manganese oxide OMS-2 nanowires under reflux conditions with KMnO4 and inorganic acids |
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| Institution: | 1. Key Laboratory of Poyang Lake Basin Agricultural Resource and Ecology of Jiangxi Province, College of Land Resource and Environment, Jiangxi Agricultural University, Nanchang 330045, China;2. Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, College of Resources & Environment, Huazhong Agricultural University, Wuhan 430070, China;1. School of Physical Science and Technology, Lingnan Normal University, Zhanjiang, 524048, PR China;2. School of Chemistry and Chemical Engineering, Lingnan Normal University, Zhanjiang, 524048, PR China;3. State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou, 510275, PR China;1. Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, China;2. School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China;1. Jiangxi Academy of Water Science and Engineering, Nanchang, 330029, China;2. Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Jiangxi Agricultural University College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang, 330045, China |
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| Abstract: | This study presents a simplified approach for size-controlled synthesis of manganese oxide octahedral molecular sieve (OMS-2) nanowires using potassium permanganate (KMnO4) and different inorganic acids (HCl, HNO3, and H2SO4) under reflux conditions. The morphology and nanostructure of the synthesized products are characterized by X-ray diffraction, Ar adsorption, and electron microscopy analysis, in order to elucidate the controlling effects of acid concentration and type as well as the formation mechanism of OMS-2 nanowires. The concentration of inorganic acid is a crucial factor controlling the phase of the synthesized products. OMS-2 nanowires are obtained with HCl at the concentration ≥0.96 mol/L or with HNO3 and H2SO4 at the concentrations ≥0.72 mol/L. Differently, the type of inorganic acid effectively determines the particle size of OMS-2 nanowires. When the acid is changed from HCl to HNO3 and H2SO4 in the reflux system, the average length of OMS-2 declines significantly by 60–70% (1104–442 and 339 nm), with minor decreased in the average width (43–39 and 34 nm). The formation of OMS-2 nanowires under reflux conditions with KMnO4 and inorganic acids involves a two-step process, i.e., the initial formation of layered manganese oxides, and subsequent transformation to OMS-2 via a dissolution-recrystallization process under acidic conditions. The proposed reflux route provides an alternative approach for synthesizing OMS-2 nanowires as well as other porous nano-crystalline OMS materials. |
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| Keywords: | Size-controlled synthesis Formation process Nanostructured OMS-2 Reflux Inorganic acid |
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