期刊
CATALYSIS TODAY
卷 224, 期 -, 页码 154-162出版社
ELSEVIER
DOI: 10.1016/j.cattod.2013.11.029
关键词
beta-MnO2; Microrod catalysts; Hydrothermal condition; Dye degradation; Catalytic mechanism
资金
- scholarship support from the China Scholarship Council [2011836054]
- National Natural Science Foundation of China [21263005, 21067004]
- Young Science and Technology Project of Jiangxi Province Natural Science Foundation [20133BAB21003]
- Jiangxi Province Education Department of Science and Technology Project [GJJ12344]
- Jiangxi Province Youth Scientists Cultivating Object Program [20122BCB23015]
Under hydrothermal conditions, a series of beta-MnO2 microrod catalysts were fabricated using different manganese precursors (MnSO4, (CH3COO)(2)Mn.4H(2)O, MnCl2.4H(2)O, Mn(NO3)(2).4H(2)O). The as-prepared beta-MnO2 microrods were characterized by powder X-ray diffraction (XRD), N-2 physical adsorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR). The characterization results showed that the morphologies and crystallinity of MnO2 were mainly determined by the hydrothermal time and temperature. Suitable hydrothermal time and temperature produced well defined beta-MnO2 microrods with high crystallinity. The obtained beta-MnO2 microrod catalysts were applied to degrade different dyes with high concentration (methylene blue (MB), methyl orange (MO), rhodamine B (RB) and acid orange II (AOII)) in the presence of H2O2. The catalytic mechanism was discussed and a Fenton-like reaction mechanism was proposed. High crystallinity and good morphology effectively promoted the catalytic performance of beta-MnO2 microrods. The efficiencies of beta-MnO2 microrods in degradation of different dyes are markedly different. The dye degradation rates followed the order of MB > AOII > RB > MO. Moreover, the beta-MnO2 microrods exhibited high stability in recycling degradation, which suggests promising applications in practical dye pollutant treatment. (C) 2013 Elsevier B.V. All rights reserved.
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