Polyacrylic gel beads reinforced by a polyamide membrane: application to copper removal in aqueous media

Laguecir, Abohachem; Frère, Y.; Danicher, L.; Loureiro, José M.; Ernst, Barbara; Burgard, M.

doi:10.1016/s0011-9164(02)00499-x

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…Therefore, the D e values in the SIRs are estimated to be in an order of magnitude of 10 -10 -10 -8 cm 2 /s, which are comparable with the reported values of 10 -12 -10 -9 cm 2 /s for the different dense gel phases. 23,30,31 In other words, the diameter of the PVA gel beads can be made much larger than that of the hydrophobic matrix type microcapsules to obtain a constant extraction efficiency for a fixed extraction time. Within an appropriate range of the gel bead size, the larger diameter is more advantageous for reducing the bed pressure drop, simplifying the preparation and handling of gel beads, enhancing the bead interfacial stability, etc.…”

Section: Resultsmentioning

confidence: 99%

“…23,24 With neither chelate extractant nor solvent used, poly(acrylic acid) gel beads having metal ion chelating properties are coated by a polyamide membrane for improved mechanical strength of the beads. [29][30][31] In addition, a thermosensitive geltype adsorbent composed of a thermosensitive polymer and an interactive polymer is presented for temperature swing adsorption. 32 The mechanisms in these solid phase extractions are not fully clarified.…”

Section: Introductionmentioning

confidence: 99%

“…Other types of solid-phase extractions have been developed with different ligands or functional groups immobilized in an inert support or stationary polymer matrix with no solvent. Silica gel as a solid support for immobilization of chelating reagents with no organic solvent is employed because it has good mechanical strength and immobilization procedures are relatively simple. , With neither chelate extractant nor solvent used, poly(acrylic acid) gel beads having metal ion chelating properties are coated by a polyamide membrane for improved mechanical strength of the beads. − In addition, a thermosensitive gel-type adsorbent composed of a thermosensitive polymer and an interactive polymer is presented for temperature swing adsorption . The mechanisms in these solid phase extractions are not fully clarified.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of Immobilized Chelate Extractant in PVA Gel Beads for an Efficient Recovery of Copper(II) in Aqueous Solution

Kobayashi¹,

Yoshimoto²,

Nakao³

2010

Ind. Eng. Chem. Res.

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To efficiently recover metals from aqueous solutions using solvent extractions, the various types of immobilized chelate extractants have been proposed because the conventional liquid-liquid extraction requires a large quantity of organic solvents and a complicated equipment system. As a basis of developing a safer, simpler, and more environment-friendly chelate extraction process, in the present work, a commercial chelate extractant, 5-dodecylsalicylaldoxime in kerosene (LIX860-I), was originally immobilized in the polyvinylalcohol (PVA) gel beads. The PVA gel beads prepared were used for recovering copper(II) in the aqueous solutions containing cupric sulfate (0.4-0.7 wt % in CuSO 4 • 5H 2 O). The gel beads of 5 mm in mean diameter were packed in a column of 5.4 cm in diameter for extracting copper(II) from the solution to the gel beads without direct contact of the solvent with the aqueous solution. The extraction was carried out in an expanded bed 8.2 cm in height by circulating the copper(II)-containing solution upward through the column. Copper(II) in the solution could steadily be extracted into the gel beads, although the process required a relatively long time due to the diffusion resistance of copper(II) in the gel phase. The progressive change of the extractant in a bead was found to be elucidated by the shrinking core model. A practical extraction process was suggested to employ the earlier stage of the extraction process where the rate was relatively high. The estimated chelation equilibrium between copper(II) and the chelate extractant in the gel beads was almost the same as that in the liquid-liquid extraction. The sorption equilibrium of copper(II) into the bead was well-described by the Langmuir-type isotherm, suggesting almost perfect utilization of the extractant immobilized in the bead. The copper(II) extracted in the gel beads was completely recovered by stripping with an aqueous sulfuric acid solution of a high concentration of 225 g/L. The gel beads could be reused at least three times with negligible leakage of the LIX860-I and no damage to the beads. The PVA gel beads are recommended to be kept in the column and cyclically utilized by extracting copper(II) from the aqueous solution and then stripping it.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of Immobilized Chelate Extractant in PVA Gel Beads for an Efficient Recovery of Copper(II) in Aqueous Solution

Kobayashi¹,

Yoshimoto²,

Nakao³

2010

Ind. Eng. Chem. Res.

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“…9,15 Interfacial polymerisation of inverse emulsions is usually limited to the use of immiscible polycondensation monomer precursors. 16,17 Phase separation in inverse emulsion is restricted to polymers which can be solubilized in the aqueous droplets. 18 Double emulsion templates 19 have been used for the preparation of hollow and aqueous-core microcapsules by solvent evaporation in which a water-in-oil-in-water (W/O/W) double emulsion precursor containing both an aqueous soluble substance and a solution of hydrophobic polymers is subsequently subjected to evaporation of low boiling point solvents resulting in the formation of aqueous or hydrophilic core capsules.…”

Section: Introductionmentioning

confidence: 99%

Double emulsion template suspension polymerisation: towards the synthesis of polyelectrolyte core porous hydrophobic shell particles for environmental applications

2013

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Herein we report a novel synthetic strategy for the synthesis of micrometre sized core-shell particles comprising a polyelectrolyte core and a porous hydrophobic shell. A water-in-oil-in-water (W 1 /O/W 2 ) double-emulsion was used as the template for the simultaneous polymerisation of both the internal aqueous and the intermediate oil phase leading to the formation of a cross-linked poly(acrylic acid) (PAAc) core contained in a poly(4-tert-butylstyrene-co-divinylbenzene) (poly(4-tBSty-co-DVB)) shell. The mass transport process from the internal aqueous phase to the external phase was reduced by means of an "oil phase locking" mechanism in which a rapid gel point transition of the oil phase ensured stability against internal aqueous-external aqueous phase (W 1 -W 2 ) coalescence. The formation of core-shell particles was favoured by the effect of acrylic acid monomer which was responsible for the selective destabilization of the internal aqueous/oil interface (W 1 /O) allowing rapid internal aqueous phase coarsening. The particles thus obtained were investigated as potential sorbent materials for the simultaneous removal and encapsulation of organic and inorganic cationic species from aqueous solutions.

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Focusing Materials Research Through Process Modeling

Loureiro

Ribeiro

Figueiredo

NATO Security Through Science Series

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Polyacrylic gel beads reinforced by a polyamide membrane: application to copper removal in aqueous media

Cited by 3 publications

References 2 publications

Preparation and Characterization of Immobilized Chelate Extractant in PVA Gel Beads for an Efficient Recovery of Copper(II) in Aqueous Solution

Preparation and Characterization of Immobilized Chelate Extractant in PVA Gel Beads for an Efficient Recovery of Copper(II) in Aqueous Solution

Double emulsion template suspension polymerisation: towards the synthesis of polyelectrolyte core porous hydrophobic shell particles for environmental applications

Focusing Materials Research Through Process Modeling

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