Facile synthesis and catalytic properties of single crystalline β-MnO2 nanorods |
Hao-Jie Cui, Hai-Zhen Huang,Ming-Lai Fu, Bao-Ling Yuan and William Pearl |
Manganese oxides are a family of microporous transition metal oxides that can form mixed-valent semiconducting octahedral molecular sieves (OMS) with tunnel structures of various sizes. Among these, β-MnO2 (pyrolusite), an ordered 1×1 tunnel structure shared with MnO6 octahedral chains, has been extensively used as a cathode material, sensors, magnetic material, and catalyst. Although many studies have been devoted to the synthetic research of β-MnO2, the large-scale preparation of 1-D β-MnO2 nanomaterials through a facile and cost-effective approach has not been fully developed. Herein, we introduce a simple one-step reflux process at atmospheric pressure for preparing scales of β-MnO2 nanorods. Single-crystalline β-MnO2 nanorods were successfully synthesized through facile reflux treatment of KMnO4 and MnSO4 in HNO3 solution. TEM and SEM images show that the synthesized β-MnO2 nanorods exhibited diameters of 20–50 nm, and lengths that ranged from approximately 0.5 to 2.0 μm with decreasing HNO3 concentrations from 0.8 to 0.1 mol/L. The prepared β-MnO2 nanorods showed excellent catalytic activity for the degradation of methylene blue dye by a Fenton-like reaction. Because of its simple manipulation and high yield, this synthetic process may have potential applications in environmental technology. |
Key words:Manganese oxide; β-MnO2 nanorods; Catalyst; Methylene blue |
Volume: Page: |
10.1016/j.catcom.2011.05.013
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