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.
Research on Chemical Intermediates – Springer Journals
Published: Jan 10, 2017
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