工业废气中CO2的吸附、固定和转化是解决温室效应和C1资源的综合利用问题的重要发展方向。针对CO2吸附-催化转化过程的原子经济性要求，以对CO2具有高吸附特性和催化活性的复合材料构筑为导向，本项目利用二维材料的化学稳定性及层数可调性，借助掺杂和剥离相结合的方法，实现改性二维氮化碳材料的可控制备；基于改性二维氮化碳材料的片层限域特征，与金属络合阴离子型离子液体通过配位作用制备新型复合材料，实现CO2在复合材料表界面上的吸附、活化和原位催化过程一体化；通过密度泛函理论计算和原位红外等表征，揭示改性二维氮化碳的空位缺陷结构、表面碱性与离子液体的金属中心、亲核阴离子之间的协同作用对CO2吸附-催化性能的影响规律，确定复合材料对CO2吸附-催化转化的作用机制。本项目的实施为解决环境保护问题和C1资源的高附加值利用问题提供新思路。

Adsorption, fixation and conversion of CO2 gas is an important development direction to solve the problems of comprehensive utilization of greenhouse effect and C1 resource. Aiming at the requirements of atomic economy of CO2 adsorption and catalytic conversion process and guided by the construction of composite materials with high adsorption properties and excellent catalytic activity for CO2, the project, based on chemical stability and layer number tunability of the layered structure of two-dimensional materials, combined with doping and delamination, could realize the controllable preparation of two-dimensional layered carbon nitride. Based on the confinement effect of two-dimensional carbon nitride, a novel type of CO2 adsorption and catalytic material was prepared through the coordination effect，which could realize the integration of CO2 adsorption、CO2 activation and CO2 in-situ catalysis on the surface of the composite materials. The synergistic effect between the vacancy defect structure、the surface properties of the modified two-dimensional carbon nitride and the metal centers、the nucleophilic anion of ionic liquid on the CO2 adsorption and catalytic conversion was respectively drawn out. Meanwhile, the nature of CO2 adsorption and catalytic conversion by the composite was confirmed. The implementation of this project will provide new ideas for solving environmental protection problems and high value-added utilization of C1 resources.