摘要
由有机配体和金属离子链接的类沸石型咪唑酯骨架(ZIFs)是金属有机框架材料中独特的一个子类,其孔结构可控,且气体储存性能优异.本研究采用溶剂热法制备了ZIF-8、ZIF-9、ZIF-68三种ZIFs材料,并对其进行X射线衍射、N2吸附脱附、热重、红外等测试表征.X射线衍射分析结果显示三种ZIFs材料的衍射峰与其标准卡一致,表明材料的成功制备.N2吸附脱附测试结果表明ZIF-8的比表面积和孔体积最大,分别高达2284.83 m2/g和3.13 cm3/g;ZIF-8、ZIF-9和ZIF-68最可几孔径分别约为1.00、6.44和0.6 nm.热重测试结果表明,ZIF-8的热稳定性最好.ZIFs材料的CO2吸附性能研究结果表明ZIF-68吸附性能最高,273 K/1 bar及298 K/1 bar条件下,可达74.37和42.62 cc/g,这可能是因为ZIF-68晶体中约0.6 nm孔径更易于CO2气体吸附.研究结果表明,0.6 nm孔径尺寸较易于吸附CO2温室气体,且ZIFs材料是一种较理想的CO2吸附材料.
Abstract
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.
基金项目
国家自然科学基金项目(12205100)
中原科技创新领军人才项目(224200510022)
国家科技期刊平台
NSTL
万方数据