Noble metal ion sorption by pyridyl and bipyridyl group-containing chelating polymers

Abstract

A series of eighteen 4‐vinylpyridine and 4‐methyl‐4′‐vinylbipyridine copolymers with different crosslinkers was examined as sorbents for the noble metal ions of Ag(I), Au(III), Pd(II), and Pt(II) from aqueous solutions. The chelating polymers possess appreciable sorption selectivity for Au(III) over Ag(I) and for Pd(II) over Pt(II). Binding abilities of the copolymers toward the noble metal ions vary as the identity of the chelating heterocyclic amine moiety and the structure of the crosslinkers are altered. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 207–213, 2001

Ordered mesoporous silica (SBA-15) derivatized with imidazole-containing functionalities as a selective adsorbent of precious metal ionsElectronic supplementary information (ESI) available: TEM image of SBA-15. See http://www.rsc.org/suppdata/jm/b3/b315829b/

“…The use of polymer-based adsorbents for precious metal adsorption has been reported. [23][24][25] It has been shown that polymeric extractants containing heterocyclic amine units adsorb Pt 21 and Pd 21 efficiently from aqueous solutions. 25 The majorities of these studies, however, have been conducted under strongly acidic conditions (pH v 1) and a long equilibrium time has been involved (y24 h).…”

“…[23][24][25] It has been shown that polymeric extractants containing heterocyclic amine units adsorb Pt 21 and Pd 21 efficiently from aqueous solutions. 25 The majorities of these studies, however, have been conducted under strongly acidic conditions (pH v 1) and a long equilibrium time has been involved (y24 h). Moreover, the recovery of precious metal ions adsorbed on the polymeric adsorbents is difficult in that desorption has been conducted by either adding toxic desorption agents or destruction of polymeric adsorbents.…”

Solid‐phase extraction in the determination of gold, palladium, and platinum

“…New publications on Au and PGM ions are regularly appearing [82,89,[97][98][99][100][101][102]. Noble metals are most often sorbed as their chloride complexes and (rarer) as bromide complexes [97].…”

“…In some cases, they cannot distinguish between oxidation states of platinum, Pt(II) and Pt(IV), when both are present in solution. Selective sorption of only Pt(II) has been reported [], hence under suitable conditions, the ions of Pt(II) and Pt(IV) [] or Pt and Pd [] could be selectively separated and enriched.…”

Adsorption Properties of Thiol-Functionalized Mesoporous Silica

“…Сорбцию проводили во фталатном буфере (рН 4,01) в течение 12 ч при 22 °С с перемешиванием [4]. Полученные максимальные сорбци-онные ёмкости (СЕ) по Pt 2+ и Pd 2+ для Thio-SBA-15 сравнимы с СЕ полимерных сорбентов [5][6][7]. 12,5).…”