title: Layer-by-layer assembly of zeolite imidazolate framework-8 as coating material for capillary electrochromatography.
abstract: In this work, open-tubular capillary column coated with zeolite imidazolate framework-8 (ZIF-8) nanocrystals was prepared by a layer-by-layer method. The coating was formed by growing ZIF-8 nanocrystals on either bare fused silica capillary wall or the capillary column premodified with amino groups. The shape and the thickness of the coating formed by using these two methods were almost the same. However, the coverage of the ZIF-8 crystals on the bare fused silica capillary wall was higher than that on the capillary column premodified with amino groups. The ZIF-8 coated capillary column was evaluated for open-tubular capillary electrochromatography. The effect of pH value, buffer concentration, and applied voltage on the separation of phenols was investigated. Good separation of nine phenolic isomers was achieved because of the strong interaction between unsaturated Zn sites and phenols. The column performance for o-nitrophenol was as high as 208 860 plates m(-1) . The run-to-run, day-to-day, and column-to-column reproducibility of retention time and resolution for p-nitrophenol and o-nitrophenol were very good with RSDs of less than 6.5%.
authors.affiliation: Key Laboratory of Functional Molecule Design and Interface Process, School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, P. R. China.
authors.forename: Qishu
authors.initials: Q
authors.lastname: Qu
authors.affiliation: Key Laboratory of Functional Molecule Design and Interface Process, School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, P. R. China.
authors.forename: Han
authors.initials: H
authors.lastname: Xuan
authors.affiliation: Key Laboratory of Functional Molecule Design and Interface Process, School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, P. R. China.
authors.forename: Kehua
authors.initials: K
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Functional Molecule Design and Interface Process, School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, P. R. China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Ding
authors.affiliation: College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, P. R. China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Xu
mesh_terms: D053801:Capillary Electrochromatography / Q000295:instrumentation* / Q000379:methods; D007093:Imidazoles / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D009596:Nitrophenols / Q000302:isolation & purification*; D017641:Zeolites / Q000737:chemistry*
chemical_list: D007093:Imidazoles; D009596:Nitrophenols; D017641:Zeolites; C029899:imidazole; C024836:4-nitrophenol
keywords: Capillary electrochromatography; Coating; Layer-by-layer; Zeolite imidazolate framework-8