Preparation And Photocatalytic Performance Of MOFs Composites Photocatalyst

The dye wastewater with high solubility and stability,in terms of governance is extremely intractable,in order to deal with the increasingly serious pollution of water,it is urgent to research a new type of material or technology for the treatment of dye wastewater.The metal organic framework(MOFs),a kind of important novel porous material,is a promptly developing materail during the last several years.Because of variety of synthesis ways,ligands and intermediate metal ions can be adjusted and controlled,MOFs possess significant application prospects in many territories,the MIL-100(Fe)as a kind of common MOF,the materials used in the the direction of catalysis has attracted widespread attention of researchers.In this paper,the research is focused on the preparation of MIL-100(Fe)photocatalyst.The narrow band carbon nitrides CNFs/MIL-100(Fe)and carbon aerogel CA/MIL-100(Fe)composite photocatalyst were synthesized by selecting a suitable method to increase the segregation efficiency of photogenerated electron-hole pairs.The results are as follows:1.In order to chose a method with relatively short period,simple operation,low cost,and have the good ability of dye degradation,the MIL-100(Fe)prepared by sol-gel method,water bath method and high pressure hydrothermal methods,respectively.The performance of catalyst was researched according to the different characterization methods.By contrast,three kinds of MOFs have bigger surface area than traditional porous materials.The MOF catalyst prepared by water bath with big surface area,large porosity and it is easy modified by other materials,so it is a kind of ideal materials for the photocatalytic degradation of dyes,the water bath method was chose as the preparation of composite MOFs catalyst,thus greatly reducing costs.2.MIL-100(Fe)prepared by water bath method was chose as the carrier for the CNFs/MIL-100(Fe)compound photocatalyst.The microstructure and surface morphology of the composite catalyst were analyzed by many characterizations and the reaction mechanism of composite photocatalyst under visible light was researched by the test of the RhB degradation.After the experiment test,the CNFs/MIL-100(Fe)composite photocatalyst activity was significantly improved compared with pure MIL catalytic.The effect of CNFs loading ratio on composite photocatalyst was studied,and the 1.5wt% MIL-100(Fe)composite photocatalytic with excellent stability got the maximum degradation value(96%)under visible light.The enhanced photocatalytic activity was attributed to the extended light absorption range and higher separation efficiency of photogenerated electron-hole pairs.It is attributed to the synergistic effect between CNFs and MIL-100(Fe).Therefore,the preparation of the composite catalyst has a good application prospect.3.Ability of MOF enhanced through combination of CA(carbon aerogel)with MIL-100(Fe)to perform the better removal of dyes from water.CA supports the structure to synergized adsorption and photocatalytic performance of MIL-100(Fe).The physicochemical and photophysical properties of nanocomposites,conformed by FT-IR,XRD,SEM and EDS spectra analysis.Properties of CA/MIL-100(Fe)compare to parent materials show better light adsorption.CA/MIL-100(Fe)-0.5 wt%show highest adsorption than parent material.The CA/MIL-100(Fe)-0.5wt%composite photocatalytic with excellent stability got the maximum adsorption and catalyst degradation value 97% for RhB.The composite photocatalyst synthesized by CA,costs will be greatly reduced and corrosion resistance,it is a kind of new material of nenergy conservation and emissions reduction.