Preparation And Application Of Carbonized MOF/MgCl₂ Hybrid Products

Metal Organic Frameworks(MOF)are new types of materials constructed by metal ion connectors and organic bridging ligands.To date,thousands of different MOF have been synthesized.Their regular morphology and controllable pore size make them attractive in applications from gas storage,separation to energy fields.Moreover,MOF can be further modified for different applications,such as doping with different metal ions.The calcination of MOF precursor is another popular approach to produce many many useful functional products,such as metal oxide,carbon materials,hybrid materials,etc.Among them,the preparation of nanoporous carbon from MOF precursors is a recent research highlight.The uniform pore structure of MOF ensures the regular pore size of its carbonized derivatives,which makes it possible to design porous carbon materials at the molecular level.Presently,Mg-MOF/MgCl2 hybrid polycrystallines with different morphologies are solvothermally synthesized using 1,3,5-benzenetricarboxylic acid(BTC)or 1,4-benzenedicarboxylic acid(BDC)as the ligand,with or without polyethylene terephthalate(PET)inducer,respectively.After calcination,the products look like a flower,bud,cube or nanosheet.When tested as adsorbent,the maximum methyl orange adsorption capacity reaches 3250 mg g-1.The reason is attributed to the carboncovered Mg salt inside the carbonized MOF.When tested as supercapacitor,the specific capacitance of carbonized MOF are about 120F·g-1,whereas carbonized MOF based on BDC shows a better rate capability(80%retention at 10A·g-1).