助催化剂选择性负载钼酸盐基材料及其光催化降解农药构效关系

Molybdates are considered as a kind of excellent performance photocatalysts due to its lamellar structure and optical properties. However, investigation of promoting space charge separation and transfer of molybdates is relatively scarce. In our prevous work, the controllable morphology of molybdates have been extensively studied, thus, we intend to use soft chemical methods to synthesize different kinds of molybdates with diverse exposed facets and then to study the growth mechanisms of molybdates. In order to promote separation and accumulation of space charges in molybdates, cocatalyst will be loaded on different exposed facets selectively, then we will figure out the mechanisms of charges separation and enhanced photocatalysis of molybdates influenced by exposed facets and cocatalyst loaded. We will also explore the inherent relationship between molybdates structure and activities of photocatalytic pesticides degradation. Design and controllable synthesis of molybdates in our current undertaking, despite the challenging, has a profound meaning for developing novel and efficient photocatalysts.

钼酸盐材料因具有层状结构和宽光谱响应范围，是一类性能优良的可见光催化剂。但对于助催化剂选择性负载钼酸盐的合成及其电荷分离与光催化性能关系的研究相对较少。本项目拟在课题组钼酸盐类光催化材料形貌调控研究的基础上，采用软化学法调控钼酸盐复合基元的不同形貌和暴露晶面，揭示形貌及晶面暴露的调控机制和影响规律；利用在钼酸盐不同暴露晶面上选择性地负载助催化剂，促进暴露晶面间的空间电荷分离效率和富集效应，探讨不同暴露晶面与助催化剂相互作用过程中的电荷分离机理；通过选择性负载助催化剂提高材料的载流子分离效率及其可见光催化降解农药活性，揭示不同钼酸盐基复合光催化材料降解动力学之间的内在联系及构效关系；实现对该类材料的构效设计和可控合成，为研制新型、高效的可见光催化材料提供基础数据和技术支持。

钼酸盐材料因具有层状结构和宽光谱响应范围，是一类性能优良的可见光催化剂。但对于助催化剂选择性负载钼酸盐的合成及其电荷分离与光催化性能关系的研究相对较少。根据项目计划书我们首先通过软化学方法调控了CdMoO4, Ag2MoO4和Bi2MoO6等几种钼酸盐基元材料的形貌和暴露晶面，并研究了上述材料的可见光光催化活性，筛选出系列性能优异的光催化材料。特别是针对光催化性能较好的Bi2MoO6材料，我们通过简单的水热方法调控合成了具有{010}和{001}两种特定暴露晶面的Bi2MoO6材料，揭示了Bi2MoO6材料形貌和晶面暴露的调控机制和影响规律。通过在Bi2MoO6材料暴露晶面上构筑溴氧化铋、还原氧化石墨烯、氧空位、金属铋等助催化剂我们成功实现了上述材料空间电荷的有效分离和富集，探讨了不同暴露晶面与助催化剂相互作用过程的电荷分离机制。最后，我们以Bi/Bi2MoO6为模型详细研究了选择性负载助催化剂提高材料的载流子分离效率及其可见光光催化降解农药活性，揭示了材料降解动力学的内在联系及构效关系。该项目为构筑新型、高效的可见光催化材料提供基础数据和技术支持。