多孔碳基石墨烯-TiO2纳米复合材料的设计制备及其光催化性能研究

项目名称： 多孔碳基石墨烯-TiO2纳米复合材料的设计制备及其光催化性能研究

项目编号： No.21207041

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 环境化学

项目作者： 刘威

作者单位： 华南农业大学

项目金额： 23万元

中文摘要： 以纳米半导体材料为光催化剂的光催化过程，是绿色、无二次污染的一种理想的环境污染治理技术。针对以TiO2为代表的传统光催化材料的不足，本项目拟对以TiO2为主体的纳米复合材料进行功能化设计与组装，构建一种新型高效光催化材料- - 多孔碳基石墨烯-TiO2纳米复合材料。该材料以天然植物为模板制备具有分级结构的多孔碳，以此为基体，通过设计与制备多孔碳基原位生长的石墨烯，再在石墨烯的表面均匀生长纳米TiO2颗粒，建立多孔碳-石墨烯-纳米TiO2三种材料之间的协同作用，从而大大提高材料对太阳光的利用效率和对污染物的降解能力。通过对材料的光催化活性研究，开展光催化材料表面氧化还原反应机理研究，探索材料的表面与界面结构对光催化过程的影响规律，阐明多孔碳基石墨烯载体与纳米半导体组分间的协同机制，建立合理的光催化机制理论模型，从而为新型光催化材料的设计与制备提供实验参考和理论依据。

中文关键词： 光催化；TiO2；石墨烯；C3N4；纳米材料

英文摘要： Photocatalytic process over semiconductor nanomaterials is an ideal technology for the treatment of environmental pollution. In the project, we intend to design and assemble new efficient photocatalytic nanomaterials, porous carbon-based graphene-TiO2 nanocomposites, which can absorb visible light as well as degradate pollutants effectively with high quantum yield. The nanocomposite architectures are fabricated functionally by porous carbon, graphene and TiO2 with well-defined geometrical shapes. Graphene is synthesized in situ in the porous carbon, which is prepared from natural plants with multi-level porous structure, and then TiO2 nanoparticles grow uniformly on the surface of graphene. The design strategy would greatly improve the poor performance of the traditional photocatalyst TiO2.The photocatalytic activities will be studied by means of photocatalytic degradation of rhodamine B and 2,4-dichlorophenol solutions, respectively. Based on the study on the degradation kinetics, the research on the oxidation/reduction reaction mechanism of the photocatalytic processes will be carried out. To interpret the synergistic mechanism between the porous carbon-based graphene with TiO2 nanocomponent, the effect of surface and interface structures of the nanocomposites on the photocatalytic process will be explored. An

英文关键词： photocatalysis；TiO2；graphene；C3N4；nanomaterials