一种具有Z-Scheme机制的高效可见光驱动的介孔AgI@Fe-MIL-88B-NH2光催化剂

摘要

Sulfonated polystyrene (PS) microspheres have been used as template to produce mesoporous Fe-MIL-88B-NH2 spherical shell with open pore.Based on the shell a novel visible-light-active AgI modified microsphere Fe-MIL-88B-NH2 was prepared by in situ reaction method.The photocatalytic activity of the resulted AgI@Fe-MIL-88B-NH2 composite was enhanced significantly as compared with pure AgI and Fe-MIL-88B-NH2,which can be derived from the enhanced adsorption capacity and the promoted separation of charge carriers.The possible mechanism for the separation of charge carriers can be attributed to the formation of a redox-mediator-free direct Z-scheme system which causes the photogenerated electrons to migrate from CB of Fe-MIL-88B-NH2 to VB of AgI,thus yielding more active · O2-and · OH.%以磺化聚苯乙烯微球为模板制备了具有开口结构的介孔Fe-MIL-88B-NH2球壳,据此进一步通过原位反应法合成一种新型具有可见光活性的AgI改性Fe-MIL-88B-NH2微球.与纯的AgI和Fe-MIL-88B-NH2相比,制备的AgI@Fe-MIL-88B-NH2复合材料的光催化活性显著提高,这是由于吸附能力和电荷分离均得到增强的缘故.电荷分离机制可归因于形成了不含氧化还原调节剂的直接Z-Scheme系统,该系统使光生电子从Fe-MIL-88B-NH2的导带迁移至AgI的价带上,从而产生活性更强的·O2-和·OH.