Imprinted polymers for the removal of heavy metal ions from water

Abstract

In wastewater treatment, the removal of heavy metals is difficult due to the limited affinity of heavy metal ions to ion exchange resins. Here imprinting polymerization is used to develop resins with high capacity and selectivity for heavy metal ions for water treatment. A random copolymer of methacrylate and methacrylamide was found to be most effective for the removal of hydrophilic metal complexes, like CdCl2, ZnCI2, and the metalloid NaH2AsO4, particularly when the porosity of these resins is increased. For hydrophobic complexes imprinting emulsion polymerization was developed and data for the effective removal of mercury dithizonate will be described. Complete removal for up to 80 ppm of cadmium and mercury with only 200 mg of imprinted resin was obtained; competition and co-imprinting experiments are described as well.

Adsorption of Cu(II), Ni(II) and Pb(II) ions onto polyamine-polyurea polymer modified with pyromellitic dianhydride: kinetic, isotherm and thermodynamic studies

“…The superiorities of chelating polymers to adsorb heavy metals are their ease of use and the fact that they can be repeatedly used, along their high adsorption capacity and selectivity [13,17]. In the literature, there are numerous reports where chelating polymers have been used to remove and recover heavy metal ions from wastewater [18][19][20][21][22]. Adsorption of some metal ions using polyamine-polyurea resin has been reported in the literature [23].…”

Synthesis of an imprinted polymer for the determination of methylmercury in marine products

“…Most of these polymers were synthesized using Hg(II) as template and complexing ligands to produce selective binding sites. The ligands usually contained a sulfur donating atom such as methacryloyl-(L)-cysteine (MAC) [1], aminothiol monomers [2,3], 1-(2-thiazolylazo)-2-naphthol [4],4-(2-thiazolyazo) resorcinol (TAR) [5] and diphenylthiocarbazone [6,7]. Compounds containing amino groups were also used for developing imprinted polymers for Hg(II) removal from aqueous solutions or preconcentration: 3-isocyanatopropyltriethoxysilane (IPTS) [8] bearing thymine (T) bases, diazoaminobenzene-vinylpyridine copolymers [9], tetrakis(3-hydroxyphenyl)porphyrin [10] or a polyaminated chitosan derivative [11].…”

Molecularly Imprinted Polymers in Biotechnology

“…The major factors influencing the binding properties of the resulting polymer include the type of functional monomer and monomer:template ratio [1,9,[104][105][106] and the porogenic solvent [105,107]. The major factors influencing the binding properties of the resulting polymer include the type of functional monomer and monomer:template ratio [1,9,[104][105][106] and the porogenic solvent [105,107].…”