Article ID Journal Published Year Pages File Type
1167175 Analytica Chimica Acta 2011 10 Pages PDF
Abstract

Molecularly imprinted polymers (MIPs) are currently used to provide selectivity in chemical sensors. In this context, a non-covalent bisphenol-A (BPA)-imprinted polymer using 4-vinylpyridine (4-Vpy) as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as crosslinker and a low volatile solvent, triethylene glycol dimethyl ether (TRIGLYME), in combination with a non-reactive linear polymer, poly (vinyl acetate) (PVAc), as porogen, was synthesized with a simple polymerization procedure. Batch rebinding experiments were carried out to evaluate the binding and selectivity properties of the BPA-MIP. The experimental adsorption isotherms were fitted and a heterogeneous distribution of the binding sites was found. The selectivity of MIP demonstrated higher affinity for target BPA and BPA-analogues over other common water pollutants. The adsorption kinetics followed the pseudo-second-order kinetic model so that the specific adsorption in the imprinted cavities by two strong hydrogen bonds could be described as a chemisorption process. The diffusion mechanism was determined by the intra-particle diffusion and Boyd models, both of them revealing that the adsorption was mainly governed by intra-particle diffusion. MIP was shown to be promising for regeneration without significant loss in adsorption capacity.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The binding affinity of BPA-MIP high affinity sites is very resilient. ► A low volatile solvent and a non-reactive linear polymer are a good porogen system. ► Selectivity recognition is achieved for aqueous samples. ► The limiting step of the adsorption process is carried out in the imprinted cavities. ► The adsorption capacity is kept when the sorbent is regenerated.

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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