Tubular metal-organic framework-based capillary gas chromatography column for separation of alkanes and aromatic positional isomers.

摘要: In this work, a tubular metal-organic framework, MOF-CJ3, with large one-dimensional channel was chosen as stationary phase to prepare capillary gas chromatographic column via verified dynamic coating procedure. The offered good separations of linear and branched alkanes, well aromatic positional isomers (ethylbenzene, xylene, cresol, hydroquinone, dichlorobenzene, bromobenzonitrile, chloronitrobenzene, nitrotoluene) based on combination host-guest interactions adsorption effects. Elution sequence most the analytes followed an increasing order their boiling points, except for separation n-heptanes/isooctane, hydroquinone isomers. Separation behavior upon different organic substances may be related pore structure in which van der Waals forces between alkanes hydrophobic inner surfaces might have great effect n-heptanes isooctane, whereas cresol were affected by (OH⋯O) hydrogen bonds formed 1,3,5-benzenetricarboxylate ligands wall. effects temperature investigated elucidate entropy enthalpy controlling process.