Magnetic porous carbon derived from a zinc-cobalt metal-organic framework: A adsorbent for magnetic solid phase extraction of flunitrazepam

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• 作者：Qiuhua Wu ; Si Cheng ; Chenhuan Wang ; Xiyang Li ; Zhi Li ; Chen Hao
• 关键词：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
• 刊名：Microchimica Acta
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：183
• 期：11
• 页码：3009-3017
• 全文大小：682 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Inorganic Chemistry
  Physical Chemistry
  Characterization and Evaluation Materials
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Wien
• ISSN：1436-5073
• 卷排序：183

文摘

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.