1. Nanorods of manganese oxides: Synthesis, characterization and catalytic application
- Author
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Yang, Zeheng, Zhang, Yuancheng, Zhang, Weixin, Wang, Xue, Qian, Yitai, Wen, Xiaogang, and Yang, Shihe
- Subjects
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MANGANESE oxides , *NANOTECHNOLOGY , *TRANSMISSION electron microscopy , *X-ray diffraction - Abstract
Abstract: Single-crystalline nanorods of β-MnO2, α-Mn2O3 and Mn3O4 were successfully synthesized via the heat-treatment of γ-MnOOH nanorods, which were prepared through a hydrothermal method in advance. The calcination process of γ-MnOOH nanorods was studied with the help of Thermogravimetric analysis and X-ray powder diffraction. When the calcinations were conducted in air from 250 to 1050°C, the precursor γ-MnOOH was first changed to β-MnO2, then to α-Mn2O3 and finally to Mn3O4. When calcined in N2 atmosphere, γ-MnOOH was directly converted into Mn3O4 at as low as 500°C. Transmission electron microscopy (TEM) and high-resolution TEM were also used to characterize the products. The obtained manganese oxides maintain the one-dimensional morphology similar to the precursor γ-MnOOH nanorods. Further experiments show that the as-prepared manganese oxide nanorods have catalytic effect on the oxidation and decomposition of the methylene blue (MB) dye with H2O2. [Copyright &y& Elsevier]
- Published
- 2006
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