氯氧化铋量子点薄膜的制备及其光催化机理研究

项目名称： 氯氧化铋量子点薄膜的制备及其光催化机理研究

项目编号： No.51302329

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 吴素娟

作者单位： 重庆大学

项目金额： 25万元

中文摘要： 氯氧化铋（BiOCl）可直接利用太阳能对环境污染物进行有效降解，成为半导体光催化材料领域的研究热点。其结构稳定性及光催化反应机理等关键问题还未有深入研究，特别是光辐照对BiOCl原子尺度上的微观结构、元素化学计量比、表面性质的影响及相应的光催化反应动力学机理还不明确。本项目将通过水化学反应法合成BiOCl量子点薄膜，控制{001}晶面择优生长和量子点颗粒尺寸。采用高分辨透射电子显微镜、电子能量损失谱对光辐照的BiOCl量子点微观结构、氯氧元素的化学计量比进行分析，研究微观结构、非化学计量比与光催化活性的内在关联。拟通过光电化学法研究光催化反应过程中电荷输运和表面反应，结合低能电子、光电子显微镜系统观测表面结构和表面态的变化，揭示光催化反应机理，探索反应动力学规律。项目将为氯氧化铋半导体光催化材料的进一步发展和应用提供科学依据。

中文关键词： 氯氧化铋；半导体光催化；可见光催化；光催化机理；超晶格

英文摘要： Since the bismuth oxychloride (BiOCl) semiconductor can convert the solar energy to chemical energy directly and achieve the degradation of the environmental pollutant effectively, it becomes one of the hot topics in the field of semiconductor photocatalysts. However, the structural stability and photocatalytic mechanism of BiOCl are still open questions and need further investigation. In particular, the photo-induced crystal structural stability, nonstoichiometric composition, and the corresponding photocatalytic process are not fully understood. The aim of the project is to prepare the BiOCl quantum dots film using an aqueous chemical solution route, and mainly focus on the control growth of the {001} facets preferred-orientation and the size of the quantum particle. The crystal structure and the stoichiometric composition will be characterized by the High Resolution Transmission Electron Microscope and Electron Energy Loss Spectroscopy, and try to find the correlations among the micro-structure, the nonstoichiometric composition and the photocatalytic activity. We further study the photocatalytic mechanism by analysing the charge transport and the surface reaction through the photoelectrochemical reaction, and characterizing the surface state and kinetic process using low-energy electron microscopy - photoele

英文关键词： BiOCl；semiconductor photocatalyst；visible light driven photocatalysis；photocatalytic mechanism；superlattice