浓硫酸氧化改性天然辉钼矿及其电催化性能研究
Oxidation Modification of Natural Molybdenite Using Concentrated Sulfuric Acid and Its Electrocatalytic Properties

摘要 用浓硫酸加热氧化法, 获得提纯的辉钼矿。利用 X 射线荧光光谱(XRF)、X 射线衍射(XRD)、X 射线光电子能谱(XPS)、扫描电子显微镜(SEM)和拉曼光谱(Raman), 对氧化前后的样品进行表征, 并测试样品的电催化性能。经浓硫酸氧化后, MoS2的(002)晶面晶粒的平均粒径减小14%, 层间距增加0.04 ？, 且S2？被氧化为S6+。结果表明, 经过浓硫酸氧化, MoS2的片层能够在一定程度上被剥离, 辉钼矿对于对硝基苯酚的还原作用增强, 还原峰电位发生正向移动。
Abstract The purified molybdenite were obtained using concentrated sulfuric acid and heating oxidation method, and the samples before and after oxidation were characterized systematically based on X-ray fluorescence spectrum (XRF), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and Raman spectroscopy. Moreover, its electrocatalytic properties were tested and analyzed. The results show that the average grain size of MoS2 (002) crystal plane direction decreases by 14% and interlayer spacing increases 0.04？ after concentrated sulfuric acid oxidation, and S2？ is oxidized into S6+, indicating that layers of Molybdenite can be stripped through oxidation. The reductive peak of potential move forward after oxidation, implying reduction enhancement on p-nitrophenol.