期刊
TALANTA
卷 222, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.talanta.2020.121603
关键词
2D metal-organic framework nanosheets; Core-shell microspheres; Chromatographic separation; Hydrophilic chromatography; Stationary phase
资金
- National Natural Science Foundation of China [21575149, 21575148]
- State Key Scientific Special Project [2016ZX05011-003]
The core-shell composites were successfully prepared by modifying silica spheres with two-dimensional MOF-FDM-23 nanosheets, showing excellent separation performance and high reproducibility in preparation.
The core-shell composites were first prepared by surface modification of silica spheres with two-dimensional MOF-FDM-23 nanosheets via a simple approach. The successful immobilization of 2D MOF-FDM-23 on the silica (2D MOF-FDM-23@silica) was confirmed by series of method including elemental analysis, X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR) transmission electron microscopy (TEM), scanning electron microscopy (SEM), powder X-ray diffraction (XRD) and the Brunauer-Emmett-Teller (BET). The obtained material showed excellent separation performance for multiple polar compounds such as sulfonamides, alkaloids, antibiotic and amino acid compounds etc. In addition, it was found to be superior to most reported MOF-based stationary phases in terms of separation performance, preparative reproducibility and chromatographic stability. The reproducibility of material preparation was demonstrated by the difference in retention time of the same mixture on three batches of the material at different times. The relative standard deviation (RSD) of the retention time for preparation repeatability was found to range from 0.5% to 1.4%. In short, the core-shell composite material prepared by this method broadened the application of MOF-based composites as chromatography stationary phase, and significantly developed the field of 2D MOF nanosheets in chromatography.
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