钨钼酸盐复合光催化材料的制备及其性能研究

发布时间：2018-12-17 04:35

【摘要】：在处理污染方面,光催化作为近些年新兴的污染处理技术因其对污染物降解彻底,不产生二次污染、工艺设备简单等优点得到广泛关注和研究,而在众多光催化剂中,钨/钼酸盐因具有独特的结构和理化性质、光学性能等受到普遍重视。本文对钼酸镉和钨酸锌进行了改性研究,首先利用水热法制备样品,然后通过X-射线衍射(XRD)、扫描电子显微镜(SEM)、紫外可见漫反射光谱(U V-vis DRS)、光电子能谱(XPS)、拉曼光谱(Raman)等表征手段来对所制备的样品材料进行表征分析,最后对其光催化性能和光催化机理进行了分析,具体研究内容如下:1.通过水热法合成了钼酸镉与石墨烯复合光催化剂,并研究了钼酸镉与石墨烯复合光催化剂的光催化性能及光催化机理。实验表明,石墨烯的加入使得样品的吸附性能和光催化性能得到了较大提升,且最佳复合量为2.5%,它的光催化活性是纯钼酸镉的5倍。2.研究了钨酸锌与钨酸铋复合光催化剂的光催化性能及光催化机理。钨酸锌与钨酸铋的复合光催化剂通过水热法合成,复合提高了样品光生电子和空穴的分离率,实验得到当Zn与W的摩尔比为1.5:100时光催化效果最好,自由基捕获实验表明空穴在光催化过程中起了重要作用。3.研究了不同pH对钨酸锌结构、物化特性及光催化活性的影响,结果表明,当pH=8时钨酸锌样品晶型最好,光催化效率也最高,在此条件下用金属铋(Bi)和金属钡(Ba)对钨酸锌进行掺杂改性,得到了掺杂量为3at%Bi和1.5at%Ba样品的光催化效果最好,并研究了其光催化机理。
[Abstract]:As a new pollution treatment technology in recent years, the photocatalysis, as a new pollution treatment technology in recent years, is widely concerned and researched by the advantages of complete degradation of pollutants, no secondary pollution, simple process equipment and the like, and in a plurality of photocatalysts, As a result of its unique structure and physical and chemical properties, the optical properties and so on are of great importance. In this paper, the modification of zinc gluconate and zinc tungstate was studied. The samples were prepared by hydrothermal method, and then by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-visible diffuse reflection spectrum (U V-vis DRS), and photoelectron spectroscopy (XPS). The characterization and analysis of the prepared sample materials were carried out by Raman and other characterization methods, and the photocatalytic performance and the light catalytic mechanism were analyzed. The specific content of the study was as follows: 1. In this paper, the photo-catalytic properties and the photocatalytic mechanism of the graphite-acid-and graphene composite photocatalysts were studied by hydrothermal method. The experiment shows that the addition of the graphene makes the adsorption property and the photocatalytic property of the sample to be greatly improved, and the optimum composite amount is 2.5%, and the photocatalytic activity of the graphene is 5 times of that of the pure graphene. The photocatalytic performance and the photocatalytic mechanism of the composite photocatalyst of zinc tungstate and tungstic acid were studied. The composite photocatalyst of zinc tungstate and tungstate acid is synthesized by hydrothermal method, and the separation rate of electron and hole of sample light is improved. The experiment results show that the molar ratio of Zn to W is 1. 5: 100. The catalytic effect is the best. The free radical trapping experiment shows that the hole plays an important role in the process of photocatalysis. The effects of different pH on the structure, physical and chemical properties of zinc tungstate and the photocatalytic activity of zinc tungstate were studied. The results showed that when pH = 8, the crystal type of zinc tungstate was the best, and the photocatalytic efficiency was the highest. The photocatalytic effect of the sample with the doping amount of 3at% Bi and 1. 5at% Ba was the best, and the light catalytic mechanism was studied.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O643.36;O644.1

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