Construction of metal organic frameworks/fluorinated titanium dioxide(MOFs/F-TiO2)nanocomposites with integrated adsorption-photocatalysis performance
Fluorinated titanium dioxide(F-TiO2)was prepared by a simple precipitation method using titanium sulfate as the titanium source,hydrogen fluoride as the fluorine source,and ammonia water as the precipitant.MIL-l00(Fe)metal organic frameworks(MOFs)were synthesized by the hydrothermal method,and MIL-100(Fe)was coupled with F-TiO2 by the hydrothermal process to successfully prepare MIL-100(Fe)/F-TiO2 nanocomposites(MOFs/F-TiO2)with integrated adsorption-photocatalysis performance.The adsorption kinetics,adsorption and photocatalytic properties,cycling stability,and coupling modification mechanism of the samples were investigated with Rhodamine B as a simulated organic pollutant.The specimens were characterized using SEM,XRD,FT-IR,XPS,UV-vis Abs,EPR,etc.The results indicated that 10％MIL-100(Fe)/F-TiO2 exhibited the best adsorption and photocatalytic activity.After treatment in the dark for 60 min,the adsorption ratio of 50 mg·L-1 Rhodamine B reached 60.6％.Under illumination for 20 min,the decolorization rate reached 96.4％,the adsorption process of Rhodamine B by the 10％MIL-100(Fe)/F-TiO2 nanocomposites follows a pseudo first order kinetic model,and the excellent adsorption-photocatalysis performance of the composites are attributed to the synergistic effect between F-TiO2 and MIL-l00(Fe),and the formation of Z-type heterojunctions.
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