Nanorods of manganese oxides: Synthesis, characterization and catalytic application

Journal Article · Wed Mar 15 04:00:00 EST 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.11.028· OSTI ID:20784909

Zeheng, Yang ^[1]; Yuancheng, Zhang ^[1]; Weixin, Zhang ^[1]; Xue, Wang ^[1]; Yitai, Qian ^[1]; Xiaogang, Wen ^[2]; Shihe, Yang ^[2]

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1. School of Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009 (China)
2. Department of Chemistry and Institute of Nano Science and Technology, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong (China)

Single-crystalline nanorods of {beta}-MnO{sub 2}, {alpha}-Mn{sub 2}O{sub 3} and Mn{sub 3}O{sub 4} were successfully synthesized via the heat-treatment of {gamma}-MnOOH nanorods, which were prepared through a hydrothermal method in advance. The calcination process of {gamma}-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 deg. C, the precursor {gamma}-MnOOH was first changed to {beta}-MnO{sub 2}, then to {alpha}-Mn{sub 2}O{sub 3} and finally to Mn{sub 3}O{sub 4}. When calcined in N{sub 2} atmosphere, {gamma}-MnOOH was directly converted into Mn{sub 3}O{sub 4} at as low as 500 deg. 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 {gamma}-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 H{sub 2}0009O.

• OSTI ID: 20784909
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 3 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CALCINATION
HEAT TREATMENTS
HYDROGEN PEROXIDE
MANGANESE OXIDES
METHYLENE BLUE
MONOCRYSTALS
NANOSTRUCTURES
THERMAL GRAVIMETRIC ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION