Binding and recognition ability of molecularly imprinted polymer toward p-nitrophenol



p-Nitrophenol is a hazardous phenolic compound and its separation and determination is very necessary to protect public health and environmental quality. In this article, macromolecule polyethyleneimine (PEI) grafted on the surface of silica particles was crosslinked using p-nitrophenol as a template and diepoxyalkyl (669) as a crosslinking agent, and molecularly imprinted polymer on the surfaces of silica gel MIP-PEI/SiO2 was prepared. The binding and recognition ability of MIP-PEI/SiO2 for p-nitrophenol were researched using batch and dynamic methods. The experimental results showed that MIP-PEI/SiO2 had high affinity, specific recognition ability, and excellent selectivity for p-nitrophenol. The saturated binding amount could reach to 155.5 mg g−1. The selectivity coefficients relative to m-nitrophenol and chlorophenol were 45.80 and 117.5, respectively. The empirical Freundlich isotherm was found to describe well the equilibrium binding data. pH of sample solution was found to have a strong influence on the binding amount. MIP-PEI/SiO2 was regenerated easily using diluted hydrochloric acid solution as eluent and MIP-PEI/SiO2 possesses better reusability. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012