卤氧化铋多级结构的制备及其可见光催化性能研究

发布时间：2018-07-11 14:28

  本文选题：BiOX + 花状微球　； 参考：《山东大学》2015年硕士论文

【摘要】：环境污染和能源危机是当前世界面临的两大难题,半导体可见光催化技术被认为是解决这两大难题的最具应用前景的技术之一,因其可有效降解有害污染物,以治理环境污染,同时可光解水制氢、还原二氧化碳制碳氢燃料等,以缓解能源危机。传统的半导体材料如TiO2,因可见光能利用率低而限制了其利用,研发可见光响应的半导体光催化剂己成为目前的研究重点之一。BiOX (X=Cl Br、I)是一类具有较高可见光催化效率的铋系材料,受到人们关注；通过调控其形貌,以增强其光催化活性,是目前研究的热点之一。我国铋资源储量丰富,开发铋系可见光催化剂具有重要的现实意义。本文就卤氧化铋多级结构的制备及其可见光催化性能进行了研究,以期为铋系可见光催化剂的研发提供依据。本论文主要研究内容及结论如下：(1)以四丁基碘化铵为碘源和模板,采用水热法合成了BiOI花状微球,考察了水热温度和时间对BiOI微球晶型和形貌的影响；采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、氮气吸附脱附、紫外-可见漫反射光谱等技术对样品进行了表征；考察了样品在可见光下对罗丹明B (RhB)降解的催化活性,发现160℃水热30 h所制备样品的催化效率最高,比BiOI纳米片高4倍多,表明形貌对其催化活性有重要影响。提出了“形貌因子”(比表面积与纳米片厚度的比值)参数,发现其光催化效率随“形貌因子”增大而增大。另外,BiOI花状微球具有良好的化学稳定性和可重复利用性。(2)以次水杨酸铋为铋源和模板,采用水热法合成了BiOX (X=Cl、Br和I)纳米带,并采用XRD、XPS、SEM、TEM、氮气吸附脱附、紫外-可见漫反射光谱和荧光光谱等技术进行了表征,考察了样品在可见光下对罗丹明B(RhB)降解的催化活性。结果表明,所制备的BiOX纳米带由高度暴露(010)面的不规则单晶纳米颗粒所组成,其光催化效率远高于高度暴露(001)面的BiOX纳米片。BiOX纳米带的高光催化活性,缘于其高比表面积和较强的可见光吸收能力。
[Abstract]:Environmental pollution and energy crisis are two major problems facing the world. Semiconductor visible light catalytic technology is considered to be one of the most promising technologies to solve these two problems, because it can effectively degrade harmful pollutants in order to control environmental pollution. At the same time, water can be photolysis to produce hydrogen, carbon dioxide to reduce hydrocarbon fuel, etc. to alleviate the energy crisis. Traditional semiconductor materials, such as TiO2, are limited in their utilization due to the low utilization of visible light energy. The development of visible light-responsive semiconductor photocatalysts has become one of the focuses of current research. BiOX (XCL-Br-I) is a kind of bismuth system materials with high visible light efficiency. In order to enhance its photocatalytic activity, it is one of the hotspots in recent years to control its morphology and enhance its photocatalytic activity. There are abundant reserves of bismuth in China, so it is of great practical significance to develop bismuth system visible light catalyst. In this paper, the preparation of bismuth halide multistage structure and its visible light catalytic properties were studied in order to provide the basis for the research and development of bismuth system visible light catalyst. The main contents and conclusions of this thesis are as follows: (1) BiOI flower-like microspheres were synthesized by hydrothermal method using four Ding Ji ammonium iodide as iodine source and template. The effects of hydrothermal temperature and time on the morphology and morphology of BiOI microspheres were investigated. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption and desorption, UV-Vis diffuse reflectance spectroscopy, and the catalytic activity of the samples for Rhodamine B (RhB) degradation under visible light was investigated. It is found that the catalytic efficiency of the samples prepared at 160 鈩，

本文编号：2115500