Aqua-Impregnated Resins. 2. Separation of Polyvalent Metal Ions on Iminodiacetic and Polyacrylic Resins Using Bis(2-ethylhexyl) Phosphoric and Bis(2-ethylhexyl) Dithiophosphoric Acids as Organic Eluents

Abstract

This paper dedicated to the further development of the novel aqua-impregnated-resin (AIR) technique reports the results obtained by studying the column separation of equimolar mixtures of Cu(2+), Al(3+), and Zn(2+) on iminodiacetic (IDA) and polyacrylic (PAR) resins by using 0.2 M heptane solutions of either bis(2-ethylhexyl) phosphoric acid (DEHPA) or bis(2-ethyhexyl) dithiophosphoric acid (DEHDTPA) as selective eluents for extractive desorption of metal ions from the resin phase. The quantitative separation of Cu(2+)-Al(3+) mixtures has been achieved by sequential elution of metals from PAR with DEHDTPA and H(2)SO(4) solutions. Purification of Cu(2+) from Al(3+) and/or Zn(2+) and Al(3+) from Cu(2+) and Zn(2+) is achieved by extractive elution of metal mixtures from IDAR or PAR with DEHPA or DEHDTPA solutions, respectively, followed by stripping of the purified metals with 1.1 M H(2)SO(4). The resulting purity of metals obtained with the yield of >96% exceed 95%.

Synthesis of nanoporous iminodiacetic acid sorbents for binding transition metals

“…Iminodiacetic acid (IDAA), effectively half of the EDTA molecule, forms strong complexes with a wide variety of metal ions [1], and polymer-based ion-exchange resins have used the IDAA ligand for chemical separations for many years [2–4]. Silica-based systems containing IDAA ligands have also been described [5, 6], and used for ion chromatography [7–14], as well as for binding a variety of metal ions [15, 16].…”

Selective Aggregation of Polyanion-Coated Gold Nanorods Induced by Divalent Metal Ions in an Aqueous Solution

“…We report herein on a study of the nature of the complexation between PAA-coated AuNRs and divalent metal ions using a simple optical detection method. Because divalent metal ions are known to form chelated structures with carboxyl moieties, [6][7][8][9][10][11] PAA-coated AuNRs could be used to capture divalent metal ions that are dissolved in an aqueous solution. Changes in the LSPB, as the result of complexation between divalent metal ions and carboxyl groups on an AuNR surface, were observed by UV-vis spectroscope as well visually.…”