Synthesis of surface molecularly imprinted silica micro-particles in aqueous solution and the usage for selective off-line solid-phase extraction of 2,4-dinitrophenol from water matrixes |
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Authors: | Luo Wei Zhu Lihua Yu Chen Tang Heqing Yu Hongxia Li Xue Zhang Xu |
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Institution: | a Department of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China b College of Environment Science and Engineering, Nanjing University, Nanjing 210093, PR China c Wuhan Institute of Physics and Mathematics of Chinese Academy of Sciences, Wuhan 430071, PR China |
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Abstract: | Very severe reaction conditions are required in the conventional synthesis of molecularly imprinted polymers (MIPs), which is unfavorable to their applications in chemical separation and analysis. A simple surface molecular imprinting approach was developed to synthesize MIP-coated SiO2 micro-particles in aqueous solutions. The 1H NMR and UV-vis spectroscopic analysis indicated that via hydrogen bonding, the functional monomer (o-phenylenediamine) can associate with the target (template) 2,4-dinitrophenol (2,4-DNP), as a model compound of organic pollutants, to form a precursor in aqueous solution. The copolymerization of this precursor and the free monomer was performed in the aqueous suspension of surface modified SiO2 particles, leading to the formation of MIP-coated SiO2 micro-particles. The MIP-coated silica particles were characterized with FT-IR, TGA, and UV-vis solid-state reflection spectroscopy, and were further demonstrated to have high adsorption capacity, excellent selectivity and site accessibility for 2,4-DNP. The new absorbent was successfully used in solid-phase extraction (SPE) to selectively enrich and determine 2,4-DNP in aqueous samples. The experimental results indicated that the MIP-SPE column yielded recoveries higher than 92% with R.S.D. <2.8%, much better than the commercial C18-SPE column, which produced a recovery less than 30% with R.S.D. <3.0%. |
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Keywords: | Molecularly imprinted polymer Synthesis Solid-phase extraction 2 4-Dinitrophenol High-performance liquid chromatography |
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