磁性银/银卤化物等离子体可见光催化剂的制备及降解MCs作用机制

The project aims to synthesize magnetic visible-light-driven plasmonic photocatalysts consisting of Ag/AgX(X=Cl, Br, I) composites dispersed over magnetic metal-organic frameworks and use them to degrade Microcystins (MCs) from drinking water. The synthesized photocatalysts will be characterized by SEM, XPS, XRD, TG-DTA, UV-VIS, PL and VSM and the photocatalytic activity and stability of the synthesized photocatalysts will be investigated. The influence of some factors (such as temperture, pH, concentration of MCs, et al) on MCs degradation, intermediate products generated and toxicity during the visible-light-driven photocatalytic degradation process will be evaluated. And also, the degradation kinetics of MCs will be studied.

本项目将银/银卤化物与磁性金属有机骨架材料结合，设计构建出可见光响应范围广、稳定高效、可简单分离的磁性银/银卤化物等离子体可见光催化剂用于水中MCs的去除。建立磁性金属有机骨架材料合成的新方法和新途径；研究不同结构磁性等离子体可见光催化剂的催化活性及稳定性，揭示催化剂结构、组成与性能之间的关系；研究光催化剂去除MCs的作用机制，优化工艺参数，为可见光催化氧化去除水中MCs技术走向实际应用提供基础资料和理论依据。

设计构建磁性等离子体金属有机骨架可见光催化剂用于水中藻毒素的去除。建立了磁性金属有机骨架Fe3O4/MIL-101(Cr)合成的新方法，设计构建了Ag-AgBr/Fe3O4/MIL-101(Cr)、AgBr/Ag3PO4-Fe3O4/MIL-101(Cr)和AgBr/Ag3PO4/TiO2-Fe3O4/MIL-101(Cr)三种磁性等离子体金属有机骨架可见光催化剂，优化了光催化剂的制备条件，考察了光催化剂的可见光催化性能，揭示了催化剂结构、组成与性能之间的关系。比较了磁性等离子体金属有机骨架可见光催化剂对水中藻毒素的去除性能，发现AgBr/Ag3PO4/TiO2-Fe3O4/MIL-101(Cr)对水中的藻毒素具有最好的去除能力，其对MC-LR的降解起主导作用的为h+和O2-•，•OH次之。