微纳结构Ag3PO4空心球/石墨烯异质结的构筑及光催化性能研究

项目名称： 微纳结构Ag3PO4空心球/石墨烯异质结的构筑及光催化性能研究

项目编号： No.51202040

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 无机非金属材料学科

项目作者： 刘勇平

作者单位： 桂林理工大学

项目金额： 25万元

中文摘要： 高活性、高稳定性、可见光吸收的光催化材料的制备是光催化领域的前沿和热点之一。Ag3PO4是最近发现的一种新型、高效的可见光光催化材料，但其比表面积小、易发生光腐蚀。为了进一步提高磷酸银的光催化活性和抑制其光腐蚀的发生，我们首次提出了"微纳空心化- - 石墨烯异质结"的合成路线，构筑具有微、纳米结构的Ag3PO4空心球/石墨烯异质结复合光催化剂。研究磷酸银空心球、磷酸银/石墨烯异质结的形成机理，建立设计空心半导体/石墨烯复合型光催化材料的制备理论和方法；探讨空心球的大小、壳层厚度、石墨烯的含量对磷酸银光催化活性及其光稳定性的影响，揭示材料的微观结构、异质结的能带结构和光催化性能之间的关系，实现对复合物微观结构和光催化性能的有效调控。本研究将为设计和制备高效、高稳定性的可见光光催化剂提供理论依据和技术基础。

中文关键词： 光催化；银；磷酸银；异质结；纳米复合材料

英文摘要： The development of highly efficient and stable photocatalyst in visible light is the frontier and hot issues in the research field of photocatalysis. Ag3PO4 was discovered as a new, efficient photocatalytic material in recently. However it has a low specific surface area and is easy to photocorrosion. For enhancing the photocatalytic activity and inhibiting the photocorrosion of Ag3PO4, a route of "hollowing micro-nano Ag3PO4 - forming heterojunction with graphene" is firstly proposed to fabricate a micro-nano structured Ag3PO4 hollow sphere/graphene heterojunction composite photocatalyst. Through studying the formation mechanism of the hollow spheres and heterojunction, the design theory and method of preparation of hollow semiconductor/graphene composite photocatalytic materials would be established. By investigating the effect of size of hollow spheres, shell thickness and content of the graphene on photocatalytic activity and light stability, the relationship between the microstructure, energy band structure of heterojunctions and photocatalytic properties would be revealed and ultimately to achieve effective control of the microstructure and photocatalytic properties of the composition. This research would provide a theoretical and technical basis for designing high efficiency and stability of visible-light

英文关键词： Photocatalysis；Silver；Silver phosphate；heterojunction；nanocomposits