Cr(VI) sorption behavior from aqueous solutions onto polymeric microcapsules containing a long-chain quaternary ammonium salt: Kinetics and thermodynamics analysis

Barassi, Giancarlo; Valdés, Andrea; Araneda, Cristián; Basualto, Carlos; Sapag, Jaime; Tapia, C.; Valenzuela, Fernando

doi:10.1016/j.jhazmat.2009.06.167

Cited by 40 publications

(28 citation statements)

References 30 publications

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“…Thus, a flexible polymeric matrix is formed that is able to retain the extractant and the metalextractant complex because of its hydrophobic character while also allowing the necessary diffusion of species through the matrix. As has been reported in previous works 14,15 , the sorption of metals onto the microcapsules would follow a mechanism that describes the diffusion of metal within the aqueous phase film that is close to the MC surface, the chemical reaction of the extractant with the metal in the surface of the microcapsule and the intraparticle diffusion of the metal-complex within the porous structure of the MC . Thus, if a too rigidly structured microcapsule was synthesized, its capacity as an adsorbent would be affected.…”

Section: Synthesis Of Microcapsulesmentioning

confidence: 61%

“…A pseudo-second-order kinetics model was applied to the experimental data of the chemisorption of metals onto the microcapsules, which fitted the experimental observations well. Recently, we have published a study concerning the adsorption of Cr(VI) ions from an aqueous acid solution on hydrophobic polymeric microcapsules containing a long-chain quaternary ammonium salt-type extractant immobilized in their pore structure 15 . It was found that Langmuir´s isotherms correlated well with the experimentally observed sorption data.…”

Section: Introductionmentioning

confidence: 99%

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MICROENCAPSULATION OF TRIOCTYLAMINE IN POLYMERIC MATRICES FOR REMOVING Zn(II) AND Cu(II) FROM CHLORIDE AQUEOUS SOLUTIONS

Fonseca

Araneda

Yazdani‐Pedram

et al. 2010

J. Chil. Chem. Soc.

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The microencapsulation of the non-specific basic extractant trioctylamine in polymeric matrices synthesized from styrene and divinylbenzene was studied. The microcapsules were prepared by adding the amine compound during in situ free radical suspension polymerization using benzoyl peroxide as the initiator and using variable proportions of both monomers. SEM analysis shows that the microcapsules have a spherical shape presenting an average surface area of 480 m 2 g -1 and a pore size around 0.5 to 1.8 nm. Synthesis of the microspheres was affected by the amount of extractant used and by the proportion of both monomers during their preparation.The obtained microcapsules were used for the sorptive removal of Zn(II) and Cu(II) ions from chloride aqueous solutions, reaching extraction extents near 90% under the best conditions, following an anion-exchange mechanism between the metallic ions and the extractant immobilized onto the microcapsules. Zn(II) and Cu(II) sorption kinetics experiments were performed and efficient uptake of both metals within a few minutes was measured. The experimental results were explained using a pseudo-second-order rate kinetics model, which fit the results of chemisorption of both metals onto the microcapsules well.

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Section: Synthesis Of Microcapsulesmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

MICROENCAPSULATION OF TRIOCTYLAMINE IN POLYMERIC MATRICES FOR REMOVING Zn(II) AND Cu(II) FROM CHLORIDE AQUEOUS SOLUTIONS

Fonseca

Araneda

Yazdani‐Pedram

et al. 2010

J. Chil. Chem. Soc.

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“…Some of the extractants used for the removal metal ions from aqueous solutions include ionic liquid, [44,45] small organic molecules, either in free form [46,47] or immobilized on polymeric surfaces [48,49] and functional polymers bearing ligands for metal complexation [50]. In comparison to the solid-liquid extractions this method has advantage of utilizing larger surface of the adsorbents for extractions and the process is proven to be useful in extracting several metal ions.…”

Section: Extraction Of Metal Ionsmentioning

confidence: 99%

Synthesis of amphiphilic block copolyamines via click reaction

Goud

Dsouza

Valiyaveettil

2015

European Polymer Journal

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“…The synthesis of P(St-co-EGDMA) microcapsules was conducted by an in situ free radical suspension polymerisation reaction in a reactor equipped with a mechanical stirring system and immersed in a water bath at 343 K [22]. A mixture of distilled water and gum Arabic was introduced into the reactor as the continuous phase and heated to the desired temperature.…”

Section: Synthesis and Characterisation Of Microcapsulesmentioning

confidence: 99%

“…In another communication, we reported the microencapsulation of trioctylamine in a polymeric matrix synthesised from styrene and divinylbenzene for the purpose of taking up Zn(II) and Cu(II) from chloride-containing aqueous solutions [21]. We also reported the quantitative uptake of Cr(VI) ions from aqueous solutions using microcapsules containing a long-chain quaternary ammonium salt-type ion-exchanger as the extractant [22].…”

Section: Introductionmentioning

confidence: 98%

Zn(II) Sorption From Aqueous Solutions Using Polymeric MicrocapsulesContaining 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester

Valenzuela

Ide

Narváez

et al. 2014

SERDJ

Self Cite

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Zn(II) sorption from aqueous solutions was studied on polymeric hydrophobic microcapsules (MCs) containing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester as the extractant (PC-88A). The microcapsules were synthesised by adding this extractant during in situ radical polymerisation using styrene and ethylene glycol dimethacrylate (EGDMA) as starting monomers and benzoyl peroxide as the polymerisation initiator. SEM analysis of the microcapsules indicated that they had a spherical shape and a rough surface. A set of experiments was designed to study Zn(II) sorption behaviour onto MCs using aqueous solutions containing 100 mg/L of Zn(II) with an initial pH of 4.0. A Langmuir isotherm model fitted the experimentally observed equilibrium sorption data well. Results of kinetics experiments conducted between 293 and 323 K were well explained by a pseudo-second order kinetic model with an activation energy of 43.27 kJ mol -1 .Calculated thermodynamic parameters revealed that the chemisorption process was spontaneous and exothermic. The observed negative entropy change indicated that the metal bound to the extractant on the surface of MCs would generate a moderately ordered structure.

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Cr(VI) sorption behavior from aqueous solutions onto polymeric microcapsules containing a long-chain quaternary ammonium salt: Kinetics and thermodynamics analysis

Cited by 40 publications

References 30 publications

MICROENCAPSULATION OF TRIOCTYLAMINE IN POLYMERIC MATRICES FOR REMOVING Zn(II) AND Cu(II) FROM CHLORIDE AQUEOUS SOLUTIONS

MICROENCAPSULATION OF TRIOCTYLAMINE IN POLYMERIC MATRICES FOR REMOVING Zn(II) AND Cu(II) FROM CHLORIDE AQUEOUS SOLUTIONS

Synthesis of amphiphilic block copolyamines via click reaction

Zn(II) Sorption From Aqueous Solutions Using Polymeric MicrocapsulesContaining 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester

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