Batch and column separation characteristics of copper-imprinted porous polymer micro-beads synthesized by a direct imprinting method

Novel Pb2+ Ion Imprinted Polymers Based on Ionic Interaction via Synergy of Dual Functional Monomers for Selective Solid-Phase Extraction of Pb2+ in Water Samples

“…15,16 Therefore, it is urgently required to develop highly selective separation/removal materials and methods for Pb 2+ . Meanwhile, as we all know, molecular imprinting is a commonly used technology to build a molecular recognition mechanism in triaxial cross-linked polymers named molecularly imprinted polymers (MIPs).…”

“…Hoai et al have prepared Cu 2+ -imprinted porous polymethacrylate microparticles using dual functional monomers of MAA and 4-VP by a suspension method, and attained batch and column separation applications. 15 Inspired by these studies, we expect to prepare a kind of highly selective IIPs for Pb 2+ recognition and removal, by virtue of the synergy of MAA and 4-VP. The two types of functional monomers, forming anion and cation, respectively, were employed to achieve the reaction optimization, which easily interacted with the Pb 2+ template to constitute a monomer/ metal complex through ionic interactions via self-assembly.…”

Novel Hg2+-imprinted polymers based on thymine–Hg2+–thymine interaction for highly selective preconcentration of Hg2+ in water samples

“…The water samples were collected in Nalgene bottles and filtered through 0.45 m pore size membrane to remove the suspended particles, and then the filtrates were alkalified to pH 8.0 with 0.1 mol L −1 NaOH and kept in a refrigerator at 4 • C for use. Recoveries were investigated by spiking the Hg 2+ standards into water samples at three concentrations (10,20 and 50 g L −1 ), and each concentration was analyzed five replicates, respectively.…”

“…The column was preconditioned successively with 0.1 mol L −1 HCl, ultrapure water and a blank solution. Then 50 mL solution containing Hg 2+ at three concentrations (10,20 and 50 g L −1 ) was passed through the column at a flow rate of 1.0 mL min −1 . The column was washed with 10 mL ultrapure water and the adsorbed Hg 2+ was eluted with 5 mL of 0.1 mol L −1 HCl, and then the extractants were detected by AFS.…”

“…In the past few decades, MIPs have aroused extensive attentions and been widely applied in many fields, such as solid-phase extraction (SPE) [4,5] and chemical sensors [6,7], owing to their desired selectivity, physical robustness, thermal stability, as well as low cost and easy preparation. Up to date, most of organic molecules [8,9], inorganic metal ions [10][11][12] and biological macromolecules [13,14] have been used as templates to prepare MIPs. However, only a small quantity of functional monomers can be used in molecular imprinting, for example, methacrylic acid (MAA), acrylic amide (AA) and 4-vinylpyridine (4-VP), to some extent which restricts the selectivity and the further applications of MIPs.…”