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Development and characterization of polymer inclusion membranes for the separation and speciation of inorganic As species

This study involves the preparation and optimization of polymer inclusion membranes (PIMs) based on the polymer cellulose triacetate and the extractant (carrier) Aliquat 336 (a mixture of quaternary ammonium chlorides) for the transport of inorganic As species (arsenite and arsenate) from their aqueous solutions. The influence of the composition of the membranes on its extraction and transport properties was investigated. Better membrane performance was obtained when the membranes did not contain plasticizer and the concentration of the extractant was high. Under these conditions arsenate (As(V)) could be quantitatively separated from As(III) within 5 h even in the presence of common anions (i.e. chloride, phosphate, nitrate, sulfate and carbonate) often encountered in natural waters and industrial and domestic wastewaters.Electrical impedance spectroscopy measurements allowed the determination of the dielectric constant and conductivity values of the PIMs of interest. These results suggested that the extracted As(V) species was HAsO4 2- which was further transported across the membrane by a hopping mechanism, counter currently to the transport of the chloride anions present at a high concentration in the stripping solution.The overall performance of the proposed PIM in terms of stability, selectivity and permeability compared favorably to those of an Aliquat 336 based supported liquid membrane and a commercial multi-valent anion exchange membrane

This work was supported by the Spanish Ministerio de Ciencia e Inovación, through Project (CTM2008-06847-C02 02/TECNO). R. Güell gratefully acknowledges a grant awarded by the University of Girona (Ref. BR06/10)

© Journal of Membrane Science, 2011, vol. 383, núm. 1-2, p. 88-95

Elsevier

Author: Güell Martí, Raquel
Kolev, Spas D.
Benavente, Juana
Salvadó Martín, Victòria
Fontàs Rigau, Clàudia
Date: 2011
Abstract: This study involves the preparation and optimization of polymer inclusion membranes (PIMs) based on the polymer cellulose triacetate and the extractant (carrier) Aliquat 336 (a mixture of quaternary ammonium chlorides) for the transport of inorganic As species (arsenite and arsenate) from their aqueous solutions. The influence of the composition of the membranes on its extraction and transport properties was investigated. Better membrane performance was obtained when the membranes did not contain plasticizer and the concentration of the extractant was high. Under these conditions arsenate (As(V)) could be quantitatively separated from As(III) within 5 h even in the presence of common anions (i.e. chloride, phosphate, nitrate, sulfate and carbonate) often encountered in natural waters and industrial and domestic wastewaters.Electrical impedance spectroscopy measurements allowed the determination of the dielectric constant and conductivity values of the PIMs of interest. These results suggested that the extracted As(V) species was HAsO4 2- which was further transported across the membrane by a hopping mechanism, counter currently to the transport of the chloride anions present at a high concentration in the stripping solution.The overall performance of the proposed PIM in terms of stability, selectivity and permeability compared favorably to those of an Aliquat 336 based supported liquid membrane and a commercial multi-valent anion exchange membrane
This work was supported by the Spanish Ministerio de Ciencia e Inovación, through Project (CTM2008-06847-C02 02/TECNO). R. Güell gratefully acknowledges a grant awarded by the University of Girona (Ref. BR06/10)
Format: application/pdf
ISSN: 0376-7388
Document access: http://hdl.handle.net/10256/12338
Language: eng
Publisher: Elsevier
Collection: MEC/PN 2009-2012/CTM2008-06847-C02-02
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.memsci.2011.08.037
Articles publicats (D-Q)
Is part of: © Journal of Membrane Science, 2011, vol. 383, núm. 1-2, p. 88-95
Rights: Tots els drets reservats
Subject: Espectroscòpia d’impedància
Impedance spectroscopy
Separació (Tecnologia)
Separation (Technology)
Membranes (Tecnologia)
Membranes (Technology)
Title: Development and characterization of polymer inclusion membranes for the separation and speciation of inorganic As species
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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