New macroporous polymers for the selective adsorption of gold (III) and palladium (II). I. The synthesis, characterization, and effect of spacers on metal adsorption

Sánchez, Juan Manuel; Hidalgo, Manuela; Valiente, Manuel; Salvadó, Victòria

doi:10.1002/(sici)1099-0518(20000115)38:2<269::aid-pola1>3.0.co;2-e

Cited by 44 publications

(9 citation statements)

References 43 publications

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“…This results in 50% of gold uptake reached within 45 and 60 minutes, respectively. Similar behavior has been observed in (18), where in some cases only 16 to 24% of phosphine sulphide ligands immobilized onto the macroporous chloromethylated styreneadivinylbenzene copolymer could be ef®ciently used in gold(III) sorption. 3 as À ln (1 7 s t as f ) vs. time, where s t denotes sorption after given time and s f is sorption at equilibrium.…”

Section: Selective Recovery Of Gold 307supporting

confidence: 69%

Selective Recovery of Gold From Acidic Solutions Using Resins With Methylenediphosphonate and Carboxymethylphosphonate Ligands

Trochimczuk

2001

Solvent Extraction and Ion Exchange

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The polymeric resins with methylenediphosphonate and carboxymethylphosphonate ligands in the ethyl ester form have been synthesized, characterized and used in the removal of Au(III) from hydrochloric acid solutions. It has been found that they are able to adsorb as much as 130±166 mg Auag of the resin at high concentration of the external solutions. At low concentrations af®nity of resins towards gold is very good and the obtained distribution coef®cient logarithm is in the range of 4.0±4.4 for the 1610 À 4 M Au(III) in 0.25±6.0 M hydrochloric acid solutions. Other metals chlorocomplexes such as Fe(III), Pd(II), Pt(II) and Ag(I) are removed to a lesser extent and the resins do not recognize Cu(II) chlorocomplexes. This allows for the use of the synthesized resins in the selective removal of Au(III) from the concentrated copper solution typically obtained in the SOLVENT processing of the electronic scrap. It has been possible to treat more than 1900 bed volumes of such solution (1610 À 4 M Au(III) and 1610 À 2 M Cu(II) in 3 M HCl) obtaining sorption of 70 mg Au(III) on resin 1 with diphosphonate ligands. This resin has been effectively regenerated using 5 wt.% solution of thiourea in 0.5 M HCl.

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Section: Selective Recovery Of Gold 307supporting

confidence: 69%

Selective Recovery of Gold From Acidic Solutions Using Resins With Methylenediphosphonate and Carboxymethylphosphonate Ligands

Trochimczuk

2001

Solvent Extraction and Ion Exchange

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“…The macroporous polymers 11 with a functional group based on triisobutylphosphine sulfide are synthesized and characterized for the selective adsorption of gold and palladium. Five coordinating polymers are prepared from chloromethylated divinylbenzene PS, either by direct attachment of the phosphine sulfide to the polymer or through a spacer chain that is modified to introduce O and S heteroatoms.…”

Section: Introductionmentioning

confidence: 99%

Coating Noble Metal Nanocrystals (Ag, Au, Pd, and Pt) on Polystyrene Spheres via Ultrasound Irradiation

2005

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The method of ultrasound irradiation is used for anchoring metallic nanocrystals (Ag, Au, Pd, and Pt) onto the surface of polystyrene spheres. In former studies, almost all the sonochemically prepared, coated metallic nanomaterials were formed as amorphous nanoparticles (Pol, V. G.; et al. Langmuir 2002, 18, 3352; Pol, V. G.; et al. Chem. Mater. 2003, 15, 1111; Zhong, Z. Y.; et al. Chem. Mater. 1999, 11 (9), 2350; Pol, V. G.; et al. Chem. Mater. 2003, 15, 1378), which were coated on various substrates (silica spheres, carbon spherules, titania, and alumina). On the other hand, the noble metal nanoparticles deposited on polystyrene spheres via ultrasound irradiation yielded nanocrystalline Ag, Au, Pd, and Pt particles on the surface of polystyrene as as-synthesized materials. The sonochemical mechanism is proposed based on chemical interactions between the particles.

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“…Chelating resins are, as mentioned above, very useful in removing metal ions from wastewater, but they often suffer from insufficient adsorption rates, owing to the hydrophobic characteristic of the polymeric support. Furthermore, the hydrophobicity of polymeric backbone can limit the intrinsic chelating properties of the functional groups [12,13]. It is well known that, phenol-formaldehyde resins is one of the most widely applied chelating resins because of their low cost, easy processing, and high hydrophilicity of the polymeric backbone.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 2-phenoxyethanol/formaldehyde copolymer beads by dispersion polycondensation and their adsorption properties for copper ions after polyamine modification

Song

et al. 2015

Desalination and Water Treatment

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A B S T R A C TTwo kinds of novel chelating resins were prepared by surface modification of 2-phenoxyethanol/formaldehyde copolymer beads (PB) with ethylenediamine (EA) and diethylenetriamine (DEA) (denoted as PB-EA and PB-DEA, respectively). The obtained resins were characterized by infrared spectra, scanning electron microscopy (SEM), and elemental analysis to demonstrate successful surface modification. The adsorption properties of the resins for metal ions are investigated. The results showed that the resins have higher adsorption capacities for Cu(II) than other metal ions such as Pb(II), Hg(II), Ag(I), Ni(II), Zn(II), Co(II), and Cr(III), with the maximum adsorption capacities of 0.15 mmol/g for PB-EA and 0.18 mmol/g for PB-DEA. Furthermore, the adsorption mechanism was studied in details. The adsorption processes of the resins for Cu(II) are governed by a film diffusion mechanism and follow the pseudo-first-order model well. The Langmuir model fits the equilibrium data better than the Freundlich isotherm. The adsorbed Cu(II) can be effectively desorbed with 1 M HNO 3 solution, and the resins can be used more than five adsorption-desorption cycles.

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New macroporous polymers for the selective adsorption of gold (III) and palladium (II). I. The synthesis, characterization, and effect of spacers on metal adsorption

Cited by 44 publications

References 43 publications

Selective Recovery of Gold From Acidic Solutions Using Resins With Methylenediphosphonate and Carboxymethylphosphonate Ligands

Selective Recovery of Gold From Acidic Solutions Using Resins With Methylenediphosphonate and Carboxymethylphosphonate Ligands

Coating Noble Metal Nanocrystals (Ag, Au, Pd, and Pt) on Polystyrene Spheres via Ultrasound Irradiation

Synthesis of 2-phenoxyethanol/formaldehyde copolymer beads by dispersion polycondensation and their adsorption properties for copper ions after polyamine modification

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