Nanorods of manganese oxides: Synthesis, characterization and catalytic application

✍ Scribed by Zeheng Yang; Yuancheng Zhang; Weixin Zhang; Xue Wang; Yitai Qian; Xiaogang Wen; Shihe Yang

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 389 KB
• Volume: 179
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2005.11.028

✦ Synopsis

Single-crystalline nanorods of b-MnO 2 , a-Mn 2 O 3 and Mn 3 O 4 were successfully synthesized via the heat-treatment of g-MnOOH nanorods, which were prepared through a hydrothermal method in advance. The calcination process of g-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 1C, the precursor g-MnOOH was first changed to b-MnO 2 , then to a-Mn 2 O 3 and finally to Mn 3 O 4 . When calcined in N 2 atmosphere, g-MnOOH was directly converted into Mn 3 O 4 at as low as 500 1C. Transmission electron microscopy (TEM) and highresolution TEM were also used to characterize the products. The obtained manganese oxides maintain the one-dimensional morphology similar to the precursor g-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 2 O 2 .