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 0.04Å 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.

Key words: molybdenum disulfide, acid leaching and oxidizing, XRD, Ramanspectroscopy, electrocatalysis

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 Å, 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。

关键词: 辉钼矿, 酸浸氧化, X 射线衍射, 拉曼光谱, 电化学催化