Ion-imprinted interpenetrating polymer networks for preconcentration and determination of Cd(II) by flame atomic absorption spectrometry

摘要: A Cd(II)-imprinted interpenetrating polymer network (IPN) containing epoxy resin, triethylenetetramine and cadmium methacrylate-acrylamide-N,N'-methylene-bis--(acrylamide) has been synthesized. IPN was prepared by in-situ sequential polymerization. First obtained gelation of resin at 30°C. Second radical co-polymerization methacrylate, acrylamide N,N'-methylene-bis-(acrylamide) 60°C. Excessive Cd(ll) ion removed with 0.5 mol L -1 HNO 3 finally a sorbent obtained. Coordination between Cd(II) functional groups primarily investigated on the basis FT-IR spectra. Adsorption-desorption characteristics as highly selective adsorbent for solid-phase extraction (SPE) preconcentration in aqueous solutions were details. Experimental results have shown that trace can be recovered almost quantitatively (95% yield) pH 5.0. The maximum static adsorption capacity ion-imprinted 105.7 μmol g . Compared to non-imprinted IPN, imprinted one higher selectivity towards Cd(II). Moreover, exhibits superior reusability stability. Precision method standard 3.2% (RSD, n = 11). successfully applied analysis two natural water samples.