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Layer‐by‐layer assembly of zeolite imidazolate framework‐8 as coating material for capillary electrochromatography
Author(s) -
Qu Qishu,
Xuan Han,
Zhang Kehua,
Ding Yi,
Xu Qin
Publication year - 2016
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.201600121
Subject(s) - capillary electrochromatography , coating , layer (electronics) , materials science , imidazolate , capillary action , electrochromatography , zeolite , chemical engineering , nanotechnology , chemistry , composite material , inorganic chemistry , organic chemistry , catalysis , engineering
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%.