期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1396, 期 -, 页码 17-24出版社
ELSEVIER
DOI: 10.1016/j.chroma.2015.04.006
关键词
Dummy molecular imprinting; Hybrid imprinting; Ordered mesoporous silica; Solid-phase extraction; Bisphenol A; HPLC-UV
资金
- National Nature Science Foundation of China [20775003, 21277106]
- Innovation Team Grant of Wuhan Textile University [201401021]
A novel hybrid dummy imprinting strategy was developed to prepare a mesoporous silica for the solid-phase extraction (SPE) of bisphenol A (BPA). A new covalent template-monomer complex (BPAF-Si) was first synthesized with 2,2-bis(4-hydroxyphenyl)hexafluoropropane (BPAF) as the template. The imprinted silica was obtained through the gelation of BPAF-Si with tetraethoxysilane and the subsequent removal of template by thermal cleavage, and then it was characterized by FT-IR spectroscopy, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption-desorption isotherms. Results showed that the new silica had micron-level particle size and ordered mesoporous structure. The static binding test verified that the imprinted silica had much higher recognition ability for BPA than the non-imprinted silica. The imprinted silica also showed high extraction efficiencies and high enrichment factor for SPE of BPA. Using the imprinted silica, a SPE-HPLC-UV method was developed and successfully applied for detecting BPA in BPA-spiked tap water and lake water samples with a recovery of 99-105%, a RSD of 2.7-5.0% and a limit of detection (S/N = 3) of 0.3 ng/mL. The new imprinted silica avoided the interference of the residual template molecules and reduced the non-specific binding sites, and therefore it can be utilized as a good sorbent for SPE of BPA in environmental water samples. (C) 2015 Elsevier B.V. All rights reserved.
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