Preparation of Metal-organic Framework Porous Glass agSALEM-2
Metal-organic framework(MOF)glass with characteristics of porous and easy forming,shows broad application prospects in the fields of adsorption and separation.However,the porous struc-ture will collapse and deform during the formation of MOF glass,which limits the separation performance of MOF glass,besides very few MOFs have been found so far.In this work,a novel MOF glass agSALEM-2 was prepared via successively melting and quenching processes,with MOF crystal SALEM-2 as precur-sor,which not only has a fusible chemical composition but also an abundant pore structure.The prepared melting-quenching process of SALEM-2 was investigated by means of XRD,SEM and TIG etc.The re-sults show that before melting,the SALEM-2 undergoes thermally amorphization,recrystallization and de-composition processes sequentially;during melting,a part of the organic ligands 2-methylimidazole(Mlm)in SALEM-2 decomposes to generate defects,leading to a lower melting point;during quenching,the Mlm can prevent the re-formation of the framework structure and thus partially preserves its porous structure in the liquid state,the higher the quenching rate,the higher the degree of retention of the po-rous structure in the liquid state.Thus,the porous glass agSALEM-2 with a BET specific surface area of up to 150 m2/g was successfully prepared.This study enriches the variety of MOF glass materials and provides an effective strategy to enhance the porosity of MOF glasses.
inorganic non-metallic materialsglass and amorphousMOF glassmelt-quenchingpo-rousN2 adsorption
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