Journal
MICROCHIMICA ACTA
Volume 183, Issue 11, Pages 3009-3017Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-016-1948-7
Keywords
Bimetallic metal-organic framework; Porous material; Magnetic solid phase extraction; Mass spectrometry; Transmission electron microscopy; Scanning electron microscopy; Adsorption-desorption isotherms; Vibrating sample magnetometry; Tea analysis; Ginger ale analysis
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Funding
- Program of Study Abroad for Young Teachers by Agricultural University of Hebei
- NSF [CHE-1149367]
- NSF IDBR [CHE-1455554]
- National Natural Science Foundation of China [31471643, 31671930]
- Natural Science Foundation of Hebei Province [B2016204136]
- Scientific and Technological Research Foundation of the Department of Education of Hebei Province [ZD2016085]
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Nanoporous carbon that contains magnetic cobalt nanoparticles (Co-NPC) was fabricated by direct carbonization of a Zn-Co bimetallic zeolitic imidazolate framework. After carbonization, the magnetic Co-NPs are well dispersed in the porous carbon matrix, with the result that the Co-NPC displays strong magnetism. The Co-NPC possesses a high specific surface area, large pore volumes and a microstructure comprised of mesopores and macropores. This results in fast molecular diffusion of the analytes along with excellent adsorption. The Co-NPC was used as a magnetic adsorbent for the enrichment of the benzodiazepine drug flunitrazepam (rohypnol) from tea and Ginger ale prior to high-resolution mass spectrometric analysis. The calibration plot is linear (with a correlation coefficient of > 0.9869) in the 1 to 500 ng mL(-1) concentration range. The limits of detection are 0.2 ng mL(-1) for Ginger ale and 1.0 ngmL(-1) for Arizona Tea samples, respectively, which is lower by about 4 orders of magnitude than those reported in the literature.
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