量子点敏化ZnO三维分级结构的制备、表征及其光催化性能研究

项目名称： 量子点敏化ZnO三维分级结构的制备、表征及其光催化性能研究

项目编号： No.21261003

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 刘新梅

作者单位： 广西科技大学

项目金额： 48万元

中文摘要： 本项目拟以能级匹配为原则，设计用量子点敏化ZnO三维分级结构，充分利用ZnO三维分级结构高比表面积、多孔道的表面特性和空间位阻效应，和量子点独特的随尺寸、组分变化的光谱特征，构筑能带结构可调、既具有较高催化活性又能抗团聚的新型ZnO复合半导体光催化剂。从基于拓宽催化剂光谱响应范围、提高催化效率及抗光腐蚀性能的角度出发指导组分、尺寸、表面态、掺杂态等可调的全光谱吸收量子点的合成。运用现代表征技术对量子点敏化的ZnO分级结构的晶体结构、表面状态、形貌等进行表征，测试其表面光物理化学性能，研究异质结体系中激子分离、传输、复合机制及其影响因素。分别在紫外和可见光照射下，考察其降解染料废水的效果，详细研究光催化降解机理和提高催化效率的基本途径，重点阐明ZnO和不同量子点之间的相互作用机制和协同催化效应，揭示纳米材料的微观结构与性能之间的构效关系，为新型高效锌基复合光催化剂的开发研究提供新思路。

中文关键词： 量子点；ZnO分级结构；敏化；光催化；复合薄膜

英文摘要： In this project, according to the matching of energy levels, some new composite photocatalytic semiconductor materials based on quantum dot-sensitized three-dimensional ZnO hierarchical architecture will be designed. The novel structure is not only helpful to improve catalytic activity and to overcome the agglomeration problem of conventional photocatalyst due to its possessing the high specific surface area and the steric effect of "house of cards" of the hierarchical ZnO architecture, but also helpful to tune the energy band structures of photocatalyst with the size- and component-dependent optical properties of colloidal semiconductor quantum dots (QDs). The synthesis of QDs with different composition, size, surface state, doping and controllable absorption spectra will be explored to extend the spectral response range, increase the photocatalytic efficiency and resistance to photocorrosion for the new composite photocatalyst. The crystal structure, surface condition, geometric shape and surface physical and chemical properties of QDs-sensitized three-dimensional ZnO hierarchical architecture will be studied by using various modern characterization techniques. The various mechanism and influencing factors of the exciton separation, transmission route, mobility and recombination in the hetero-junction structu

英文关键词： Quantum dots；ZnO hierarchical architecture；Sensitization；Photocatalysis；Composite thin films