Abstract
To functionalize MnO2 with foreign ions is one of the commonly used methods to improve the adsorption/oxidation properties of MnO2. Boron‐doped MnO2 was prepared by the reaction of MnSO4, KMnO4, and boric acid by a facile hydrothermal method. Boron‐MnO2 was characterized by X‐ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM), energy dispersive X‐ray analysis (EDX), transmission electron microscopy (TEM), high‐resolution TEM (HRTEM), selected area electron diffraction pattern (SAED), and X‐ray photo‐electron spectroscopy (XPS) techniques. The characterization of XPS and EDX confirms that boron has been doped into MnO2, but the boron dopant has no obvious effect on the crystallization of MnO2 as shown by the results of XRD and Raman characterization. The boron‐doped MnO2 nanorods display high performance in the methyl orange degradation with a decolorization degree of 90% in 2 min (5% B‐MnO2 dosage, 5 mg; methyl orange concentration, 20 mg L−1).
Highlights
Manganese oxides have diverse structures with many derivative compounds [1]
During the review process of our paper, very recently, Chi et al [24] reported that boron-doped manganese dioxide showed superior electrochemical performance as supercapacitors and the boron dopant was an effective way to improve and modify the characteristics of manganese oxide
The decolorization experiment was performed in a round bottom flask at room temperature
Summary
Manganese oxides have diverse structures with many derivative compounds [1]. Generally, the valence of Mn in manganese oxides can be +2, +3 or +4, and there may be two or three kinds of valence coexisting in the same crystalline structure. The characteristics in structure make manganese oxides possess unique chemical and physical properties. There are two ways to improve the adsorption/oxidation properties of MnO2. Compared with the commonly used metal ions, nonmetal elements for MnO2 are rarely reported [21, 22]. The structure of TiO2 and MnO2 has somewhat similarity. Inspired by such fact, we tried to synthesis borondoped MnO2 via reactions among MnSO4, KMnO4, and boric acid under hydrothermal conditions. During the review process of our paper, very recently, Chi et al [24] reported that boron-doped manganese dioxide showed superior electrochemical performance as supercapacitors and the boron dopant was an effective way to improve and modify the characteristics of manganese oxide. The application in the decolorization of industrial acid dye, methyl orange, was studied as probe reaction to evaluate its activity
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