Xu Yuelong, Ren Bin, Wang Ran, Zhang Lihui, Jiao Tifeng, Liu Zhenfa
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.
Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
Nanomaterials (Basel). 2018 Dec 22;9(1):10. doi: 10.3390/nano9010010.
In the present study, nanoscale rod-shaped manganese oxide (MnO) mixtures were successfully prepared from graphitic carbon nitride (C₃N₄) and potassium permanganate (KMnO₄) through a hydrothermal method. The as-prepared MnO nanomixtures exhibited high activity in the adsorption and degradation of methylene blue (MB). The as-synthesized products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), surface area analysis, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Furthermore, the effects of the dose of MnO nanomixtures, pH of the solution, initial concentration of MB, and the temperature of MB removal in dye adsorption and degradation experiments was investigated. The degradation mechanism of MB upon treatment with MnO nanomixtures and H₂O₂ was studied and discussed. The results showed that a maximum adsorption capacity of 154 mg g was obtained for a 60 mg L MB solution at pH 9.0 and 25 °C, and the highest MB degradation ratio reached 99.8% under the following optimum conditions: 50 mL of MB solution (20 mg L) at room temperature and pH ≈ 8.0 with 7 mg of C, N-doped MnO and 0.5 mL of H₂O₂.
在本研究中，通过水热法成功地从石墨相氮化碳（C₃N₄）和高锰酸钾（KMnO₄）制备了纳米级棒状氧化锰（MnO）混合物。所制备的MnO纳米混合物在亚甲基蓝（MB）的吸附和降解方面表现出高活性。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、表面积分析、X射线衍射（XRD）和X射线光电子能谱（XPS）对合成产物进行了表征。此外，研究了MnO纳米混合物的剂量、溶液pH值、MB的初始浓度以及染料吸附和降解实验中MB去除温度的影响。研究并讨论了MnO纳米混合物和H₂O₂处理MB的降解机理。结果表明，在pH 9.0和25℃条件下，对于60 mg L的MB溶液，最大吸附容量为154 mg g，在以下最佳条件下，MB的最高降解率达到99.8%：50 mL的MB溶液（20 mg L），室温，pH≈8.0，7 mg的C、N掺杂MnO和0.5 mL的H₂O₂。
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