β-MnO2 microrods for the degradation of methyl orange under acid condition from aqueous solutions

β-MnO2 microrods for the degradation of methyl orange under acid condition from aqueous solutions Beta-manganese dioxide (β-MnO2) microrods were hydrothermally synthesized from ammonium persulfate [(NH)4S2O8] solution using manganese sulfate (MnSO4) as reductant at 180 °C for 3 h. The characterizations, including X-ray diffraction, scanning electron microscopy, and transmission electron microscopy, showed that the crystallinity and morphology of the as-synthesized samples were well-defined β-MnO2 microrods with the diameters of about 100 nm and lengths of about 2–4 μm. To explore the optimal degradation conditions, the as-synthesized β-MnO2 microrods were employed into the degradation of methyl orange dye solution with the concentration of 20 mg/L in the presence of H+ with pH values equalling 1.0, 1.5, 2.0, 3.0, 5.0, and 7.0, respectively. The results indicate that the degradation efficiency could reach 98% after 9 min at the pH value of 1.0 or 2.0. Also, the lower the pH value, the higher the degradation efficiency. Based on these experimental results, a proper mechanism of the degradation process of methyl orange is proposed and the rationality of the mechanism is further investigated through the scientific control tests. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

β-MnO2 microrods for the degradation of methyl orange under acid condition from aqueous solutions

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Publisher
Springer Netherlands
Copyright
Copyright © 2017 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-016-2857-4
Publisher site
See Article on Publisher Site

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