Chelex 100 And Amberlite IRC 743 Case Study

1.2.3. Chelating resins with amino/carboxyl group A series of amino/imino-carboxyl resins was synthesized in aqueous phase by a solid-phase synthesis method. The blown-up parameter confirms the feasibility for industrialization. Having exchange property with acid and base together. The resulting resins show good properties for the removal and even recovery of heavy-metal ions from their aqueous solutions or wastewater [33]. The Na form of two chelating ion exchange resins Chelex 100 (Bio-Rad) and Amberlite IRC 748, both of which have iminodiacetic acid function group, was used to exchange Cu2+ and Zn2+ from aqueous solutions. It was shown that the rate constants for Cu2+ and Zn2+ exchange with Amberlite IRC 748 resin were larger than with Chelex 100 resin under comparable conditions [34]. A novel chelating resin containing many amino and carboxyl functional groups, PS-EDTA resin, was prepared from chloromethylated polystyrene bead by reacting with ethylenediamine and chloroacetate in aqueous phase in sequence. Adsorption behavior of the resin for Ag (I) ions in aqueous solutions were investigated [35]. The possibility of removal of heavy metal ions Cu (II), Zn (II), Co (II), Ni (II), Pb (II) and Cd (II) in the presence of complexing agents with the aminopolycarboxylic acid groups namely EDTA, NTA,
The effects of initial Ag (I) concentration, contact time, solution pH and coexisting ions on the adsorption capacity of Ag (I) were systematically investigated. Moreover, the chelating resin could selectively adsorb more Ag (I) ions than other heavy metal ions including: Cu (II), Zn (II), Ni (II), Pb (II) and Cr (III) during competitive adsorption in the binary metal species systems, which indicated that it was a highly selective adsorbent of Ag ( I) from aqueous solution