AgI/MOF-253的制备及其可见光催化性能研究

Synthesis of AgI/MOF-253 and study on its photocatalytic performance

采用溶剂热法合成了铝基金属有机骨架材料MOF-253,通过将半导体光催化剂Ag I固载到MOF-253上合成不同摩尔比的Ag I/MOF-253复合材料,利用XRD、SEM、FT-IR、UV-Vis DRS和氮气物理吸附等对其进行表征。选取光催化降解有机染料罗丹明B(Rh B)作为模型反应,研究了Ag I/MOF-253作催化剂时,Ag I的负载量、双氧水浓度对可见光催化降解Rh B反应性能的影响。结果表明,Ag I和MOF-253摩尔比对催化剂性能有重要影响,优化后的反应体系60 min内对Rh B的降解率可达96%;催化剂循环使用4次,降解效率仍保持在95%以上。通过活性物种捕获实验探讨了影响该复合材料降解Rh B的光催化活性关键因素。

MOF-253,an aluminium based metal-organic framework,is synthesized through solvothermal method.AgI/MOF-253 composites with different molar ratios are obtained through immobilizing Ag I on MOF-253 via in-situ formation.Ag I/MOF-253 samples are characterized by XRD,SEM,FTIR,UV-Vis DRS and N2 adsorption-desorption analysis.Degradation performance of Ag I/MOF-253 with different Ag I loading amounts are evaluated by degrading organic dye rhodamine B(Rh B)under visible light irradiation,different Ag I loading amounts and different concentrations of hydrogen peroxide are also explored.Results show that the molar ratio of Ag I to MOF-253 has an important effect on the photocatalytic activity of Ag I/MOF-253.Under optimal conditions,the degradation rate of Rh B over Ag I/MOF-253 can reach 96%within 60 minutes.AgI/MOF-253 catalyst can be recycled 4 times with degradation efficiency remaining above95%.Key factors affecting the photocatalytic activity of RHB are explored through active species trapping experiments.