Journal
APPLIED SURFACE SCIENCE
Volume 328, Issue -, Pages 649-657Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2014.12.085
Keywords
Molecularly imprinted mesoporous silica polymer; Vanillic acid; Molecular recognition; Surface imprinting
Categories
Funding
- National Science Funds of China [21077042]
- Research Project of Science & Technology Department of Hunan Province, China [2012SK3145]
- Aid program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
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A vanillic acid imprinted mesoporous silica polymer (MIPs) was prepared by copolymerizing a modified mesoporous silica molecular sieve with template molecule, functional monomer and cross-linker in present work. Interaction between the template and functional monomer was investigated by ultraviolet/visible spectrophotometry. These MIPs were characterized by Fourier transmission infrared spectrometry (FTIR) and scanning electron microscopy (SEM). Adsorption dynamics and thermodynamic behavior of MIPs was explored and the selective recognition capability evaluated. Also, the applicability for the MIPs as solid phase extraction media was tested. Results indicated the 1:1 (mole ratio) complex of vanillic acid-4-vinylpyridine might predominate in the pre-polymerization mixture and the MIPs obtained possessed rapid binding dynamics and higher affinity toward template molecules, reaching adsorption equilibrium within 230 min with the highest adsorption amount of 50.7 mg g(-1). Freundlich model was shown best to describe isotherm adsorption for the MIPs. The MIPs could selectively bind template molecule with selectivity coefficients of 1.36-1.50. In addition, a higher enrichment capability when using it for gathering target compound from methanol extract of Artemisia stelleriana and a good reusability during adsorption-desorption recycling use could be observed. (C) 2014 Elsevier B.V. All rights reserved.
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