Silver sorption on acrylic copolymers functionalized with amines. Equilibrium and kinetic studies

Buhaceanu, Rodica; Sarghie, Ioan; Bârsănescu, Adriana; Dulman, Viorica; Bunia, I.

doi:10.2478/s11532-009-0064-5

Cited by 4 publications

(2 citation statements)

References 37 publications

(40 reference statements)

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“…Functionalized cross‐linked polymers ion exchangers are used as carrier matrices in a variety of medical, hydrometallurgical, environmental, and biomedical applications 7. Polymeric resins can provide selective removal of heavy metals and could be used for final wastewaters purification and treatment 8. Among them, owing to their high physicochemical stability and the hydrophilic structure,9, 10 acrylic copolymers are important macromolecular supports for ion exchangers.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Copper(II) Ion Sorbents Obtained by Calcium Carbonate Mineralization on Functionalized Cross‐Linked Copolymers

Mihai

Bunia

Doroftei

et al. 2015

Chemistry A European J

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A new type of Cu(II) ion sorbents is presented. These are obtained by CaCO3 mineralization from supersaturated solutions on gel-like cross-linked polymeric beads as insoluble templates. A divinylbenzene-ethylacrylate-acrylonitrile cross-linked copolymer functionalized with weakly acidic, basic, or amphoteric functional groups has been used, as well as different initial inorganic concentrations and addition procedures for CaCO3 crystal growth. The morphology of the new composites was investigated by SEM and compared to that of the unmodified beads, and the polymorph content was established by X-ray diffraction. The beads, before and after CaCO3 mineralization, were tested as sorbents for Cu(II) ions. The newly formed patterns on the bead surface after Cu(II) sorption were observed by SEM, and the elemental distribution on the composites and the chemical structure of crystals after interaction with Cu(II) were investigated by EDAX elemental mapping and by FTIR-ATR spectroscopy, respectively. The sorption capacity increased significantly after CaCO3 crystals growth on the weak anionic bead surface (up to 1041.5 mg Cu(II) /g sample) compared to that of unmodified beads (491.5 mg Cu(II) /g sample).

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Section: Introductionmentioning

confidence: 99%

Highly Efficient Copper(II) Ion Sorbents Obtained by Calcium Carbonate Mineralization on Functionalized Cross‐Linked Copolymers

Mihai

Bunia

Doroftei

et al. 2015

Chemistry A European J

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“…Their functional groups contain mainly different kinds of N-and S-donor atoms and/or chelating properties. To give an example, triethylenetetramine and N,Ndimethylaminopropylamine functionalized acrylic copolymers were found to have a capacity of approximately 100 mg/g, but they were selective for Cu over Ag even at relatively low excess of Cu (equilibrium concentrations Cu = 10 mg/L, Ag = 1 mg/L) (Buhaceanu et al, 2009). While some materials have been reported to exhibit good selectivity for Ag over base metals in certain conditions such as dilute solutions in nitrate medium (Zhang et al, 2012), good selectivity in highly concentrated chloride solutions has not been reported with any commercial or experimental adsorbents or ion exchangers.…”

Section: Introductionmentioning

confidence: 99%

Ion exchange recovery of silver from concentrated base metal-chloride solutions

et al. 2015

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Ion exchange has not been extensively studied nor industrially used for recovering small amounts of silver from concentrated base metal-chloride solutions. A novel multistep process utilizing a weak anion exchanger with polyamine functionality is proposed and its performance investigated experimentally. Suitability of a silica based polyamine functional resin WP-1 to the task was demonstrated by comparing Ag uptake and selectivity of several ion exchange resins and adsorbents using batch equilibrium experiments. HCl was found to be the best choice for washing impurities, especially Cu, from the bed after the loading step. Tetrasodium salt of EDTA was found suitable especially for selective desorption of lead from the loaded bed, but also other impurities were scrubbed if still present after the wash. Both thiosulfate and thiourea were shown to be effective for elution of Ag from the WP-1 bed, but thiourea is preferred because of the slight affinity of thiosulfate towards the resin. Stability of the performance of the process was shown in several consecutive adsorption-elution cycles containing all the needed washing and scrubbing steps. With the developed process, 72% pure silver product was obtained. As the washing step can be designed such that no silver is lost, the recovery yield for Ag depends only on the length of the loading step, and even 100% recovery can thus be achieved for the whole process.

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Determination of Cu, Fe, and Ni in Spices after Preconcentration on Diaion‐HP 20 Resin as Their Zincon Complexes

Karatepe

Soylak

Elçi

2011

CLEAN Soil Air Water

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In this work, a new separation-preconcentration method was developed for the determination of trace amounts of Cu(II), Ni(II), and Fe(III) by flame atomic absorption spectrometry (FAAS). Analytes were complexed by using zincon (2-[2-[alpha(2-hydroxy-5-sulfophenylazo) benzylidene] hydrazino] benzoic acid sodium salt). The analyte ions were quantitatively adsorbed on a Diaion HP-20 resin at pH 5. The retained metal ions on the resin were eluted by acetone. The analytical parameters such as pH of the sample, eluent type and volume, sample volume, and flow rates of the solution and the eluent were investigated. The influences of concomitant ions on the recoveries of the analytes were also examined. The instrumental detection limits for the analytes after application of the presented solid-phase extraction procedure were in the range of 0.72-1.41 mg/L. The validation of the presented procedure was checked by analyzing certified reference material of SRM1515 Apple Leaves. The procedure was performed by analyzing some spice samples.

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Silver sorption on acrylic copolymers functionalized with amines. Equilibrium and kinetic studies

Cited by 4 publications

References 37 publications

Highly Efficient Copper(II) Ion Sorbents Obtained by Calcium Carbonate Mineralization on Functionalized Cross‐Linked Copolymers

Highly Efficient Copper(II) Ion Sorbents Obtained by Calcium Carbonate Mineralization on Functionalized Cross‐Linked Copolymers

Ion exchange recovery of silver from concentrated base metal-chloride solutions

Determination of Cu, Fe, and Ni in Spices after Preconcentration on Diaion‐HP 20 Resin as Their Zincon Complexes

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