Some examples of the use of amphoteric ion-exchange resins for inorganic separations

Samczyński, Zbigniew; Dybczyński, R.

doi:10.1016/s0021-9673(97)00942-4

Cited by 27 publications

(15 citation statements)

References 22 publications

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“…However, the value of correlation coefficient, R, 2 displayed an inversely trend, which showed that adsorption of ammonia nitrogen (NH 3 -N), colour and chemical oxygen demand (COD) on Indion MB 6 SR resin were not adopted in Langmuir isotherm model. In agreement with the hypothesis by Samczynski and Dybczynski (1997), the fit of Langmuir isotherm model for the bindings of COD in carboxylate sites is rarely applicable. Accordingly, Koivula et al (2000) suggested that the sorption and desorption kinetics and selective loading characteristics of some commercial resins are governed not only by the target metal concentrations, but also by competing adsorbates and changes of the concentrations.…”

Section: Resultsmentioning

confidence: 80%

Semi-aerobic stabilized landfill leachate treatment by ion exchange resin: isotherm and kinetic study

et al. 2015

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This study was carried out to investigate the treatability of ion exchange resin (Indion MB 6 SR) for the removal of chromium (VI), aluminium (III), zinc (II), copper (II), iron (II), and phosphate (PO 4 ) 3-, chemical oxygen demand (COD), ammonia nitrogen (NH 3 -N) and colour from semi-aerobic stabilized leachate by batch test. A range of ion exchange resin dosage was tested towards the removal efficiency of leachate parameters. It was observed that equilibrium data were best represented by the Langmuir model for metal ions and Freundlich was ideally fit for COD, NH 3 -N and colour. Intra particle diffusion model, pseudo first-order and pseudo second-order isotherm models were found ideally fit with correlation of the experimental data. The findings revealed that the models could describe the ion exchange kinetic behaviour efficiently, which further suggests comprehensive outlook for the future research in this field.

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Section: Resultsmentioning

confidence: 80%

Semi-aerobic stabilized landfill leachate treatment by ion exchange resin: isotherm and kinetic study

et al. 2015

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“…9 The Retardion AG 11A8 resin has the following affinity in pure water for anions: SO4 Dybczynski. 7,11,12 A high selectivity of the resin to cadmium (II), copper(II) and lead(II) has been observed and can be attributed to complexation of these metal ions with polyacrylic acid. It should be noted that ampholytes like amino acids are less retained than salts formed by strong acids and strong bases, 13 suggesting the absence of two-points of coordination (or "quadrupole" interactions) between the functional groups of the amino acid and the oppositely charged sites on the resin.…”

Section: ·2 Retardion (Snake-cage Type) Resinsmentioning

confidence: 99%

Zwitterionic Ion-Exchangers in Liquid Chromatography

Nesterenko

Haddad

2000

ANAL. SCI.

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The idea of combining both anion-and cation-exchange groups in a single particle of ion-exchange resin for the purpose of improvement of ion-exchange selectivity appeared shortly after the invention of polymeric ion-exchange resins. Stach 1 synthesised a zwitterionic ion-exchange resin containing both sulfonic acid and quaternary ammonium functional groups in 1951. This material was obtained by copolymerization of styrene and vinylchloride, followed by the introduction of quaternary ammonium functional groups by reaction of chloro-groups with trimethylamine, and then sulfonation with sulfuric acid to give sulfonic acid groups. However this first zwitterionic exchange resin was not fully characterized and its physico-chemical properties and performance were not evaluated. Originally, phenolformaldehyde polycondensation type resins were very popular and the occurrence of anion-exchange functional groups and residual phenol groups provided some zwitterionic properties for this material in alkaline media where the phenol group was dissociated. These resins had a monotonic distribution of functional groups over the entire volume of the resin. Since 1951 the approaches to the synthesis and design of zwitterionic ion-exchangers were directed towards localization of the oppositely charged groups in a bonded layer on the surface of the particle or on attached molecules.Zwitterionic ion-exchangers are considered to include only those materials that contain the charged groups in a single particle, rather than mixed-bed ion-exchangers where a mixture of cation-and anion-exchangers is used. However, agglomerated ion-exchangers containing a layer of electrostatically retained microbeads around a core particle of opposite charge fall under the scope of this review. In some sources of literature the terms amphoteric and bipolar ion-exchangers have been also used. 2The distribution of the oppositely charged groups can vary considerably and the following types of zwitterionic ionexchangers can be identified: (i) Polyampholyte resins having a continuous distribution of oppositely charged groups in the whole volume of the ionexchange particle. (ii) Pellicular resins containing a layer of opposite charge on a charged core particle, with this layer comprising microparticles, latex microbeads, a polymer film, or a simple treated outer surface of the core (e.g. sulfonated), for the purpose of adding functional groups of opposite charge sign to the functional groups on the core. Zwitterionic ion-exchangers represent a new direction in the development of stationary phases for different modes of high-performance liquid chromatography. The combination of positively and negatively charged sites in a single particle, or within the functional groups of a single molecule attached to the surface of an adsorbent, provides unique opportunities to vary the selectivity of separation. The classification of zwitterionic ion-exchangers based on their structure, distribution of oppositely charged groups, and their applications is considered.

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“…The Langmuir equation is based on the assumptions that maximum adsorption corresponds to a saturated monolayer of adsorbate molecules on the adsorbent surface, that the energy of adsorption is constant, and that there is no trans-migration of adsorbate in the plane of the surface [31,32], which is represented by: (5) where, q e is the amount adsorbed metal ion at equilibrium (mg/g), and k is Langmuir constant or the "affinity" parameter (L/mg), and q max is the maximum amount of metal ion per weight of the membrane (mg/g). The linear form of Langmuir adsorption model can be given as [33,34]:…”

Section: Adsorption Isotherm Studiesmentioning

confidence: 99%

Removal of Metal Ions From Aqueous Solutions Using Crosslinked Polyethylene -GTMFJ-Polystyrene Sulfonic Acid Adsorbent Prepared by Radiation Grafting

Nasef

Saidi

Ujang

et al. 2010

J. Chil. Chem. Soc.

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Crosslinked polyethylene-graft-polystyrene sulfonic acid (PE-g-PSSA) adsorbent prepared by simultaneous radiation induced grafting of styrene/divinyl benzene (DVB) mixture onto low density polyethylene (PE) film followed by sulfonation was investigated for the adsorption of Co(II), Cu(II), Ni(II), Pb(II) and Ag(I) ions from aqueous solutions on batch process basis. The effects of treatment parameters such as contact time, initial metal ion concentration, pH and temperature of the solution, on the adsorption capacity of the membrane were studied. The adsorption capacity of metal ions were found to be strongly dependent on the initial metal ion concentration and pH of adsorption medium and increased in the order of Ni(II)>Co(II)>Cu(II)>Pb(II)>Ag(I). Langmuir isotherm model was found to be more fitting to the adsorption equilibrium data of all metal ions than Freundlich isotherm model. The adsorption kinetics of all tested metal ions was found to follow the pseudo-first order kinetic model. The membrane showed an interesting stability represented by five repeated adsorption/desorption cycles of heavy metal ions without any significant loss in its adsorption capacity. It can be suggested that crosslinked PE-g-PSSA membrane obtained in this work can be effectively used for the adsorption of heavy metal ions from aqueous solutions and the preference order is Ni(II)> Co(II)>Cu(II)>Pb(II)> Ag(I).keywords: radiation induced grafting, crosslinked sulfonic acid adsorbent, adsorption equilibrium, adsorption kinetics, removal of heavy metal ions.

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Some examples of the use of amphoteric ion-exchange resins for inorganic separations

Cited by 27 publications

References 22 publications

Semi-aerobic stabilized landfill leachate treatment by ion exchange resin: isotherm and kinetic study

Semi-aerobic stabilized landfill leachate treatment by ion exchange resin: isotherm and kinetic study

Zwitterionic Ion-Exchangers in Liquid Chromatography

Removal of Metal Ions From Aqueous Solutions Using Crosslinked Polyethylene -GTMFJ-Polystyrene Sulfonic Acid Adsorbent Prepared by Radiation Grafting

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