Abstract
Atrazine molecular imprinted polymers (MIPs) were comparatively synthesized using identical polymer formulation by far-infrared (FIR) radiation and ultraviolet (UV)-induced polymerization, respectively. Equilibrium binding experiments were carried out with the prepared MIPs; the results showed that MIPuv possessed specific binding to atrazine compared with their MIPFIR radiation counterparts. Scatchard plot’s of both MIPs indicated that the affinities of the binding sites in MIPs are heterogeneous and can be approximated by two dissociation-constants corresponding to the high-and low-affinity binding sites. Moreover, several common pesticides including atrazine, cyromazine, metamitron, simazine, ametryn, terbutryn were tested to determine their specificity, similar imprinting factor (IF) and different selectivity index (SI) for both MIPs. Physical characterization of the polymers revealed that the different polymerization methods led to slight differences in polymer structures and performance by scanning electron microscope (SEM), Fourier transform infrared absorption (FT-IR), and mercury analyzer (MA). Finally, both MIPs were used as selective sorbents for solid phase extraction (SPE) of atrazine from lake water, followed by high performance liquid chromatography (HPLC) analysis. Compared with commercial C18 SPE sorbent (86.4%–94.8%), higher recoveries of atrazine in spiked lake water were obtained in the range of 90.1%–97.1% and 94.4%–101.9%, for both MIPs, respectively.
Highlights
Imprinted polymers (MIPs) as an artificial template made recognition material with high affinity and selectivity for the target molecule, have attracted more and more attention since this technique was first developed by Wulff [1] and Mosbach [2]
Regardless whether FIR- or UV-polymerization methods were used, it was shown that Molecularly imprinted polymers (MIPs) possessed more pores than Non-imprinted polymers (NIPs) and larger average pore diameters were observed for the MIPs
The pores of the polymers are usually formed by two methods: (1) Large pores are obtained by the presence of porogenic agent; and (2) Cavities are in the imprinting procedure, by providing the specificity by reason of their complementarity towards the template molecules [29]
Summary
Imprinted polymers (MIPs) as an artificial template made recognition material with high affinity and selectivity for the target molecule, have attracted more and more attention since this technique was first developed by Wulff [1] and Mosbach [2]. Far-infrared radiation and ultraviolet-induced free radical polymerization methods were applied to prepare atrazine MIPs using methacrylic acid (MAA) as the functional monomer, ethylene glycol dimethacrylate (EDMA) as the crosslinker, dichloromethane as the porogen, 2,2'-azobisisobutyronitrile (AIBN) or Irgacure 1800 as the FIR- radiation initiator or UV- initiator, respectively. Comparative analysis of both MIPs and their respective NIPs were carried out using a. The synthesized MIPs were utilized as SPE sorbents for selective extraction of atrazine from contaminated water samples, with sample recovery, followed by the determined by HPLC
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