新型金属-有机框架材料分离性能研究  

Study on Seperation Performance of a Novel Microporous Metal-Organic Framework

作　　者：熊姗[1] 方智利[1] 何忠义[1] 钟昀[1] 刘云晶 李康宇 

机构地区：[1]华东交通大学理学院,江西南昌330013

出　　处：《分析测试学报》2016年第5期590-594,共5页Journal of Instrumental Analysis

基　　金：国家自然科学基金项目(21365012)

摘　　要：采用基于1,3,5-三[4-苯甲酸]-均苯三甲酰胺配体构筑的具有一维孔道及酰胺活性基团的金属-有机框架(MOF-Sm-L)作为毛细管固定相,研究其在气相色谱中分离烷烃、醇类和取代芳香烃方面的性能。实验结果表明,烷烃、醇类及酚类异构体在这种MOF上得到了有效分离。这些有机物的分离基于毛细管内壁存在的范德华力,以及有机物内的羟基与MOF材料的活性基团酰胺之间的氢键作用力。分离芳香异构体过程为放热过程,同时受焓和熵的控制。More attention has been given to developing a microporous material, metal -organic frameworks（MOF） with large surface area as an advanced separation media in the field of separation science. In this work, a novel metal - organic framework, { [ Sm （L） （DMF） ] · 2 （DMF）· 5 （H2O） } （MOF- Sin- L）, with a one-dimensional channel and active amido groups was chosen as stationary phase to prepare a capillary gas chromatographic column via a verified dynamic coating pro- cedure to study the separation performance of linear alkanes, linear alcohols and substituted aromat- ics. The column could offer good separations for linear alkanes, linear alcohols, as well as aromatic positional isomers （e. g. cresol, hydroquinone, bromobenzonitrile, chloronitrobenzene and nitrotolu- ene）. The separation behaviors of the column upon different organic substances may be related to the 1D pore structure of MOF - Sm - L, in which the van der waals forces between the compounds with- out hydroxyl and the hydrophobic inner surfaces might have great effect on separation of the com- pounds without hydroxyl, whereas the separation of the hydroxyl compounds was affected by （OH…O or OH…N） hydrogen bonds formed between the analytes and the active amido groups on the pore wall except for the van der waals forces. The effect of temperature on separation of aromatic positional iso- mers was investigated to elucidate entropy and enthalpy controlling of the separation process.

关 键 词：金属有机框架 气相色谱 分离 芳香烃异构体 

分 类 号：O657.71[理学—分析化学] O741.6[理学—化学]