共轭COFs/BiOX(X=Cl,Br,I)复合材料强化光催化还原U(VI)的去除机制

核能作为清洁能源蓬勃发展，铀(U)作为核能重要的原料需求日益增大，在铀矿开采过程中带来不可忽视的环境问题。在铀污染治理中，将易溶的U(VI)转化为难溶的U(IV)是原位处理的最好方法之一。光催化还原法利用光能驱动反应，是一种环境友好的绿色处理技术。新型复合材料既可以打破传统半导体材料自身结构的局限性，又可以突破单一元组分物理化学性质，使得光生载流子在界面处高效分离与利用。二维共轭体系材料COF-TpPa-1修饰光催化剂BiOX后，对U(VI)的光催化还原去除率显著提高，但该现象背后的强化机制尚不明确。本项目在前期研究之上，阐明BiOX@TpPa-1复合材料“固定化+协同化”在强化U(VI)还原去除的反应机制，揭示二维共轭材料TpPa-1修饰BiOX复合材料的结构特征与光催化还原强化U(VI)固定化去除性能之间的“构效关系”，为利用清洁能源催化还原处理含铀废水，提供新材料、新方法与新技术。

Nuclear energy is booming as a clean energy, and the demand for uranium (U) as an important raw material of nuclear energy is increasing. In the process of uranium mining, environmental problems can not be ignored. In the management of uranium pollution, the conversion of soluble U(VI) to insoluble U(IV) is one of the best methods for in-situ treatment. Photocatalytic reduction is a kind of environmental friendly green treatment technology, which uses light energy to drive reaction. The new composite photocatalysis materials can not only break the limitations of traditional semiconductor materials, but also break through the physical and chemical properties of a single component, making efficient separation and utilization of photogenerated carriers at the interface. The two-dimensional conjugated system material COF-TpPa-1 modified photocatalyst BiOX, which can significantly improve the photocatalytic reduction removal rate of U(VI), but the mechanism behind this phenomenon is not clear. Based on the previous research, the object is to clarify the mechanism of "immobilization + synergism" in the process of U(VI) immobilization removal by BiOX@TpPa-1 photocatalytic reduction, and to reveal the "structure-function relationship" between the structural characteristics and the performance of photocatalytic reduction U(VI) immobilization removal. This project will provide new materials, new methods and new technologies for the treatment of uranium-containing wastewater by photocatalytic reduction with clean energy.