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Preparation and phenol-recognizing ability of a poly(methacrylic acid) molecular imprint on the surface of a silica gel |
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| Authors: | Zhiguo Yuan Youzhi Liu Fuqiang An |
| Institution: | 1. School of Chemical Engineering and Environment, North University of China, Taiyuan, 030051, China 2. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, China |
| Abstract: | Molecularly imprinted solid phase extraction is an excellent tool for the preconcentration of trace analytes. We report on the preparation of such a material by firstly graft-polymerizing methacrylic acid onto the surface of silica gel particles, and then imprinting it by using phenol as a template and ethylene glycol diglycidyl ether as a crosslinker. The binding and recognition of phenol were examined by static methods. The binding capacity at saturation is 160?mg·g?1 in 9?h at pH 6. The selectivity coefficients relative to o-cresol and chlorophenol are 22 and 23, respectively. The pH value has a large effect. Adsorbed phenol can be eluted easily from the imprint with diluted sodium hydroxide solution, and the material is reusable. Binding isotherms of NIP-PMAA/SiO2 and MIP-PMAA/SiO2 towards phenol, o-cresol and chlorophenol. The binding amount of NIP-PMAA/SiO2 towards three species is equivalent nearly. However, it would be quite different after imprinted with phenol. The binding amount of MIP-PMAA/SiO2 towards phenol doesn??t change, but the binding amount of MIP-PMAA/SiO2 towards o-cresol and chlorophenol is much lower than that towards phenol. The facts mentioned above prove that MIP-PMAA/SiO2 has high affinity, high recognition ability and special selectivity for phenol. This result shows that the surface molecular imprinting technique is feasible and successful |
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