埃洛石纳米管原位构筑Z型Bi2MoO6/Au/Cu2O光催化剂的异质界面机制及协同催化

水体有机污染历来是困扰世界各国的难题，光催化技术被视为解决该难题的重要绿色途径，而现有光催化材料存在载流子复合率高、稳定性差和吸附性弱的缺陷。为解决上述不足，本项目基于天然埃洛石独特的纳米管结构和良好的吸附性能，采用接枝改性剂对埃洛石管壁进行修饰，改善其表面基团的定向诱导作用，选择具有可见光活性的Bi2MoO6和Cu2O作光系统Ⅰ、Ⅱ，Au作高效电子转移体，在埃洛石表面通过层层组装原位构筑壳(Bi2MoO6)-核(Au)-壳(Cu2O)结构的高效Z型催化体系。拟着重研究改性剂对埃洛石管壁的接枝改造作用及对催化剂单元的定向诱导规律，阐明载流子在Z型异质界面中的迁移机制和吸附与催化协同作用机理，明确异质界面结构与载流子迁移率、迁移通道之间的关系。通过调控催化剂的微观结构，优化吸附和催化的协同作用，制备出高效、绿色降解水体有机污染物的纳米矿物基Z型光催化剂，为此类材料的开发提供理论和实验依据。

Water organic pollution is always a major world-wide problem and photocatalytic technology is regarded as an important green way to solve this problem. While the existing photocatalytic material has some disadvantages such as high carrier recombination rate, poor stability and weak adsorption. Based on natural halloysite nanotube structure and high adsorption properties, this project draws to use the graft modifier to modify halloysite wall in order to improve its induced orientation and solve the above problems. Visible light activity Bi2MoO6 and Cu2O used as light system Ⅰ and Ⅱ, Au used as efficient electron transfer body, shell(Bi2MoO6)-core(Au)-shell (Cu2O) Z-scheme catalytic system is synthesized through layer by layer assembly. It tends to focus on the transformation and directional induced law of the graft modifier on the wall and the catalyst unit respectively, definite carriers transfer mechanism in Z-scheme heterojunction interface and synergy mechanism between the adsorption of halloysite and the catalysis of catalyst. Combined with the structure change of Z-scheme catalytic system, it reveals relationship mechanism among the structure of the hetero interface and carrier mobility, migration channel, achieves controllable preparation of the catalyst structure, optimizes the adsorption and catalytic cooperative behavior. Nano-mineral based Z-scheme photocatalyst which is expected to be applied in degradation of water organic contaminants efficiently and greenly will be prepared. It will provide theoretical and experimental basis for application of this type of material.