Citation:
YANG Ze-Heng, SONG Xin-Min, ZHANG Wei-Xin, WANG Hua, WANG Fang. Synthesis and Catalytic Performance of α-/β-MnO2 Nanorods[J]. Chinese Journal of Applied Chemistry,
;2008, 25(1): 13-16.
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α-and β-MnO2 nanorods were successfully prepared by a hydrothermal method based on the redox reaction of KMnO4 and ascorbic acid(AA).XRD,TEM techniques were used to characterize the as-prepared MnO2 samples.The results indicated that reaction temperature and reaction time were the key factors to determine the crystallographic forms of the final products from the hydrothermal system,in which the molar ratio of AA to KMnO4 was 1:5.α-MnO2 nanorods were obtained when the reaction was conducted at 150~160℃ for 12 h,while β-MnO2 nanorods were prepared at 170℃ for 24 h.The catalytic activities of the as-prepared MnO2 nanorods and commercial MnO2 were evaluated by minitoring the degradation of fuchsin acid in the presence of H2O2.Both α-and β-MnO2 nanorods exhibited higher catalytic activity on the degradation of fuchsin acid than bulk MnO2.β-MnO2 had the highest activity among the three,resulting in 97.6% decoloration of the fuchsin acid solution within 60 minutes.
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Keywords:
- hydrothermal method,
- nano MnO2,
- fuchsin acid,
- catalytic activity
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