Preparation of ZIFs Materials and Its CO2 Adsorption Properties
Zeolitic imidazolate frameworks (ZIFs) crystal,which are linked by organic ligands and metal ions is a unique subclass of metal organic framework materials,which owns a controllable pore structure and excellent gas storage performance.Three kinds of ZIFs materials,such as ZIF-8,ZIF-9 and ZIF-68,were prepared by solvothermal method and characterized by X-ray diffraction,N2 adsorption-desorption,thermogravimetry and Fourier Transform infrared spectroscopy.XRD results showed that the diffraction peaks of three ZIFs materials were consistent with their standard cards,indicating the successful preparation of these materials.N2 adsorption-desorption measurements indicated that ZIF-8 owns the highest specific surface area and pore volume among these three samples,which are as high as 2284.83 m2/g and 3.13 cm3/g,respectively.ZIF-8,ZIF-9,and ZIF-68 have the most probable pore sizes of 1.00,6.44,and 0.6 nm,respectively.TG test showed that ZIF-8 exhibited the best thermal stability.CO2 adsorption measurements showed that the adsorption capacity of ZIF-68 was the best among these three kinds of ZIFs materials,reaching up to 74.37 cc/g and 42.62 cc/g at 273K/1bar and 298K/1bar,respectively,which might be due to the approximate pore size of 0.6 nm of ZIF-68 crystal for CO2 adsorption.All results indicate that the pore size of 0.6 nm is more favorable for the adsorption of CO2,and ZIFs materials is a relatively ideal adsorbent for CO2.
Metal organic frameworksZeolitic imidazolate frameworks(ZIFs)CO2 adsorptionPore structure
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