Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (6): 1108.

• Articles • Previous Articles     Next Articles

Synthesis of β-MnO2 Nanofibers Based on MCM-41 Template and Their Catalytic Decomposition of Methylene Blue Dye

YANG Ze-Heng*, LI Hong-Yan, ZHANG Wei-Xin   

  1. Key Laboratory of Controllable Chemistry Reaction & Material Chemical Engineering of Anhui Province, School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China
  • Received:2009-10-14 Online:2010-06-10 Published:2010-06-10
  • Contact: YANG Ze-Heng. E-mail: yangzh0219@sina.com
  • Supported by:

    国家自然科学基金(批准号: 20871038, 20876031, 20976033)和安徽省教育厅资助项目(批准号: TD200702, KJ2008B21Z)资助.

Abstract:

β-MnO2 nanofibers were successfully prepared based on MCM-41 mesoporous template. Firstly, Mn-MCM-41 was synthesized by impregnating mesoporous MCM-41 template with an aqueous ethanol solution of Mn(NO3)2 and heating at 450 ℃ for 4 h under air, and then the manganese oxide was obtained through dissolving the MCM-41 template with NaOH solution. Through X-ray diffraction, high resolution transmission electron microscopy and N2 adsorption and desorption isotherm characterizations, the as-prepared manganese oxide was shown to be the pure phase of β-MnO2 nanofibers with diameters less than 3 nm. These ordered β-MnO2 nanofibers formed a mesoporous structure similar to the MCM-41 template, with a high surface area of 136.5 m2/g. We demonstrated the high catalytic efficiency of β-MnO2 nanofibers as catalyst in the oxidation of methylene blue(MB) dye with H2O2. The decoloration rate of 60 mg/L MB solution reached 97.59% within 100 min, indicating that the catalyst can degrade high concentration of MB solution efficiently.

Key words: MCM-41; Template; β-MnO2; Nanofibers; Catalysis

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