文献类型：期刊文献

中文题名：ZIF-8的合成、表征及正己烷吸附性能

英文题名：Synthesis,Characterization and n-Hexane Adsorption Performance of ZIF-8

作者：刘克峰[1];任丹妮[1];孙辉[1];沈本贤[1];刘纪昌[1]

机构：[1]华东理工大学石油加工研究所,上海200237

年份：2016

卷号：37

期号：10

起止页码：1856

中文期刊名：高等学校化学学报

外文期刊名：Chemical Journal of Chinese Universities

收录：CSTPCD;;EI(收录号：20164202917848);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000387777700015)】；北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：Supported by the Natural Science Foundation of Shanghai, China (No. 16ZR1408100)

语种：中文

中文关键词：ZIF-8;正己烷;吸附动力学;吸附容量;动态吸附

外文关键词：ZIF-8; n-Hexane; Adsorption kinetics; Adsorption capacity; Dynamic adsorption;

摘要：以甲醇为溶剂,硝酸锌六水合物为锌源,2-甲基咪唑为有机配体,通过溶剂热法合成了金属有机骨架材料ZIF-8;采用X射线衍射(XRD)、氮气吸附、热重-差热分析(TG-DSC)和扫描电子显微镜(SEM)等方法对ZIF-8样品进行了表征;研究了正己烷在ZIF-8上的液相吸附动力学和动态选择性吸附性能.结果表明,合成的ZIF-8晶体具有方钠石结构,结晶度较高,孔结构主要为0.37~1.10 nm的微孔,BET比表面积为1836 m2/g,孔体积为0.65 cm^3/g.TG-DSC和高温原位XRD分析结果表明,合成的ZIF-8具有良好的热稳定性能.283~313 K时,正己烷在ZIF-8上液相吸附的扩散系数为(2.53~8.88)×10-12cm^2/s,扩散活化能为31.11 k J/mol;308 K时,ZIF-8对正己烷的动态饱和吸附量为187.3 mg/g,由吸附穿透曲线计算得出Thomas速率常数为2.17×10^(-3)m L·min^(-1)·mg^(-1).与5A分子筛相比,ZIF-8对正己烷的吸附容量高出约1倍,液相吸附表观扩散时间常数高出约70%.
The zeolitic imidazolate framework ZIF-8 was synthesized through a solvothermal process employing methanol as the solvent,zinc nitrate hexahydrate and 2-methylimidazole as zinc source and organic ligand,respectively. The products were characterized by means of XRD,N2 adsorption,TG-DSC and SEM. In addition,selective adsorption performance for n-hexane on ZIF-8 was investigated. It is indicated that synthesized ZIF-8 has the sodalite crystal structure and a high crystallinity. From the N2 adsorption results,ZIF-8 product has a pore size range of 0. 4—1. 1 nm,BET specific surface area of 1836 m^2/ g and pore volume of 0. 65cm^3/ g. Both TG-DSC and high-temperature in situ XRD analyses suggest its excellent thermal stability. As the temperature increases from 283 to 313 K,the diffusion coefficient for n-hexane adsorption on ZIF-8 varies from2. 53 ×10^-12 to 8. 88 ×10^-12cm^2/ s and diffusion activation energy is evaluated to be 31. 11 kJ / mol. At 308 K,the dynamic adsorption capacity and Thomas adsorption rate constant for n-hexane on ZIF-8 are 187. 3 mg/g and 2. 17 ×10^-3mL·min^-1·mg^-1,respectively. As compared to 5A molecule sieve,ZIF-8 displays around100% higher adsorption capacity and almost 70% faster diffusion rate.