Preparation and characterization of polymeric microspheres for Cr(VI) extraction

Ochoa, Nelio Ariel; Illanes, Cristián Omar; Marchese, José Abramo; Basualto, Carlos; Valenzuela, Fernando

doi:10.1016/j.seppur.2006.03.012

Cited by 17 publications

(6 citation statements)

References 32 publications

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“…Among them, many studies have used biopolymers (i.e., chitosan) [10], active carbon [11], zeolites [12], and graft copolymers [13]. In recent years, the use of polymeric microcapsules (MC) synthesized by an in situ radical polymerization method has attracted the attention of some researchers with the aim of applying them to the removal and recovery of heavy metals from aqueous solutions [14][15][16][17][18]. Microcapsules correspond to a porous polymeric matrix that contains an immobilized suitable extractant compound, which is chosen to selectively extract the desired metals.…”

Section: Introductionmentioning

confidence: 99%

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

Barassi

Valdés

Araneda

et al. 2009

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

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

Barassi

Valdés

Araneda

et al. 2009

Journal of Hazardous Materials

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“…In the case of cellulose capsules, as far as we know, there is just one report where capsules are prepared from a magnetic microsphere made of cellulose nanocrystals; the polystyrene microsphere filler is dissolved with acetone, leaving a magnetic shell [8]. Thus, even when there are reports of extractant-filled capsules made with synthetic [9][10][11][12][13][14][15][16] and natural [17] polymers, the preparation and use of cellulose capsules for the removal of chemical species remains an issue that has not been developed.…”

Section: Introductionmentioning

confidence: 99%

Development of Cellulose Acetate Microcapsules with Cyanex 923 for Phenol Removal from Aqueous Media

Pérez-Silva

Ibarra

Castañeda‐Ovando

et al. 2018

Journal of Chemistry

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Microcapsules of cellulose acetate with Cyanex 923 were prepared and used in this study for phenol removal from water and synthetic textile wastewater. The influence of several factors on the microcapsules extraction efficiency was studied, as well as characterization and phenol adsorption isotherm. Microcapsules characterization demonstrated the extractant reagent encapsulation, while in a batch mode procedure, good adsorption of phenol (ca. 5.5 × 10−3 mol Kg−1) has been reached. A slight decrease in phenol extraction percentage was obtained when synthetic textile wastewater was used (ca. 4.955 × 10−3 mol Kg−1), although a decrease in color was observed due to dye microcapsule extraction. Results indicate that this method is a promising alternative to conventional phenol removal technologies for aqueous samples of low phenol concentrations or in textile effluents.

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“…Recently, the microencapsulation of ion-exchangers has been studied in hydrometallurgy for the uptake of several heavy metals from various aqueous solutions using different microcapsule preparation methods [17][18][19]. Here, we have employed a chemical method based on an in situ polymerisation by mixing the monomers required to prepare the polymeric matrix and the initiator of the reaction with the extractant in an appropriate solvent.…”

Section: Introductionmentioning

confidence: 99%

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

Valenzuela

Ide

Narváez

et al. 2014

SERDJ

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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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Preparation and characterization of polymeric microspheres for Cr(VI) extraction

Cited by 17 publications

References 32 publications

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

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

Development of Cellulose Acetate Microcapsules with Cyanex 923 for Phenol Removal from Aqueous Media

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

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