液相剥离天然辉钼矿制备纳米二硫化钼及其光电催化性能研究

发布时间：2018-07-10 15:04

本文选题：天然辉钼矿 + 液相剥离　；参考：《内蒙古大学》2017年硕士论文

【摘要】：二维层状结构的MoS_2,由于其较大的能级间隙,弥补了石墨烯没有带隙的缺点,随分子层数可调的带隙更带来了许多独特的光学,电学性质,近几年成为类石墨烯材料中的研究热门。大批量获取高质量单层或极少层的MoS_2是应用的前提。本论文以天然辉钼矿为原料,研究了液相剥离制备纳米MoS_2的方法,对制备的MoS_2进行了表征及光电性能的测试,并将其应用于光电催化协同微生物燃料电池中。主要研究内容如下:(1)采集经矿场初步富集后的天然辉钼矿矿粉,进一步粉碎,并分析成分和结构。利用液相剥离MoS_2常用的两种典型溶剂:N-甲基吡咯烷酮和表面活性剂P123的水溶液,成功地通过温和的超声水浴剥离得到了纳米MoS_2。表征结果表明天然辉钼矿剥离产物既有量子点,又有纳米片,纳米片高度剥离至几个分子层。同样方法剥离商品MoS_2主要产物是量子点,且产量低于辉钼矿。(2)利用易挥发溶剂异丙醇在超声水浴中剥离得到了MoS_2纳米片,相同条件下商品MoS_2不能剥离出纳米粒子。考察了不同溶剂剥离天然辉钼矿方法对后续应用的影响。异丙醇剥离MoS_2纳米片虽然产率较低,但溶剂的易挥发性方便产品的后续利用。(3)提出液相剥离天然辉钼矿增强剥离效率的主要原因可能为超声时矿物中含有的石英相SiO_2的撞击作用。(4)研究了天然辉钼矿剥离产物的光电性能,证实天然辉钼矿剥离的纳米MoS_2有较优秀的荧光发射性能和光电导性。利用产品的大比表面积和光电性能,修饰阴极提高MFC的产电效率,在光照下获得118.20mW/m~2的最大功率密度,是相同条件下空白组的近2倍,黑暗条件空白组的近3倍。
[Abstract]:Due to its large energy level gap, MoS2s in two-dimensional layered structure make up for the defect that graphene has no band gap. The band gap with adjustable molecular layer number brings many unique optical and electrical properties. In recent years, it has become a hot topic in graphene-like materials. Mass access to high-quality single-or very few layers of Mos-S-2 is a prerequisite for application. In this paper, the method of liquid phase stripping preparation of nano-MoS _ 2 was studied by using natural molybdenum as raw material. The prepared MoS _ s _ 2 was characterized and its photoelectric properties were tested, and it was applied to photocatalytic co-microbial fuel cell. The main contents of the study are as follows: (1) the natural molybdenum ore powder which has been preliminarily enriched in the mine field is collected, further comminuted, and the composition and structure are analyzed. Two typical solvents: 1. N-methylpyrrolidone and surfactant P123, which are commonly used in liquid phase stripping of MoS2, are used to obtain nano-MoSSP _ 2 by mild ultrasonic water bath stripping. The characterization results show that the natural molybdenum peeling products include both quantum dots and nanochips, which are highly stripped into several molecular layers. In the same way, the main product of mos _ 2 is quantum dots, and the output is lower than that of molybdenum. (2) MoS2 nanoparticles are obtained by stripping isopropanol, a volatile solvent, in ultrasonic water bath. The effect of different solvent stripping methods on the application of natural molybdenum was investigated. Although isopropanol peeled off MoS2 nanoparticles in low yield, However, the secondary utilization of volatile and convenient products of solvents. (3) it is suggested that the main reason for the enhanced stripping efficiency of natural molybdenum in liquid phase may be the impingement of quartz phase Sio _ 2 contained in minerals during ultrasound. (4) the impact of natural molybdenum on natural molybdenum is studied. Optoelectronic properties of peeling products, It is proved that the natural molybdenum peeling nano-MoS _ S _ 2 has excellent fluorescence emission property and photoconductivity. By using the large specific surface area and optoelectronic properties of the product, the modified cathode can improve the power generation efficiency of MFC. The maximum power density of 118.20mW / mm2 is obtained under illumination, which is nearly twice as high as that of the blank group under the same condition and nearly 3 times that of the blank group under the dark condition.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O643.36

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