Modification of the AMX membrane surface: Temperature dependence of anion exchange equilibrium

Guesmi, Fatma; Chérif, Hanène; Hamrouni, Béchir

doi:10.1002/cjce.21744

Cited by 7 publications

(3 citation statements)

References 35 publications

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“…The modification of ion exchange resin by adsorption of a polyelectrolyte and in particular by simple immersion of the resin in a solution of polyelec-trolyte led us to choose three factors, namely, the initial concentration of polyethyleneimine (X1), the molecular weight of the polyethyleneimine (X2) and the pH of the medium (X3) [22]. We studied in this part the influence of these factors on the modification of the anionic resin DOWEX 1X8.…”

Section: Effect Of the Experimental Parameters On The Modification Ofmentioning

confidence: 99%

Ion Exchange Equilibrium between DOWEX 1X8 Resin Modified by Polyethyleneimine and Electrolyte Solutions

Chérif¹,

Guesmi²,

Missaoui³

et al. 2013

JWARP

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In order to improve the selectivity of anion exchange resin, the surface of gel type anion exchange resin was modified with polyethyleneimine (PEI). In the proposed work an attempt to the utilization of commercial anion exchange resin modified by adsorption of polyethyleneimine was investigated. Many conditions of modification of anion exchange resin surface were studied. The influent parameters on the DOWEX 1X8 resin modification were determined using a factorial experimental design. The ion exchange reactions were studied for modified and unmodified resin and electrolyte solutions containing 2 3 Cl , NO and SO 4    . All experiments were performed at constant ionic strength I = 0.3 mol·L −1 and constant temperature T = 298 K. Ionic exchange isotherms were established for the binary systems: 2 2 3 4 NO SO .   3 4Cl NO , Cl SO andThe obtained results show that nitrate ion was more sorbed than chloride and sulfate. The order of preference for the anions studied in this investigation is:All the results given by this resin were compared with those obtained with the AMX anion exchange membrane. Selectivity coefficients and thermodynamic constants for the three binary systems and for the two resins were determined. The modified resin became more selective towards monovalent anions.

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Section: Effect Of the Experimental Parameters On The Modification Ofmentioning

confidence: 99%

Ion Exchange Equilibrium between DOWEX 1X8 Resin Modified by Polyethyleneimine and Electrolyte Solutions

Chérif¹,

Guesmi²,

Missaoui³

et al. 2013

JWARP

Self Cite

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“…Ion exchange models for resins have been reported widely [108][109][110][111], with the basic theory for ion exchange first developed by Helmholtz in 1879 [112]. To design a model for ion exchange, the equilibrium relationships for ions distributing between the resin and the solution phase need to be quantitatively and accurately captured.…”

Section: Figurementioning

confidence: 99%

Inorganic anion removal using micellar enhanced ultrafiltration (MEUF), modeling anion distribution and suggested improvements of MEUF: A review

Chen

Jafvert

et al. 2020

Chemical Engineering Journal

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Surfactants have been used often in environmental remediation strategies due to their special amphiphilic nature which alters surface and water interfacial properties. When the aqueous concentration of a cationic surfactant far exceeds the critical micelle concentration (CMC), a large concentration of cationic micelles will form in water. These micelles each consist of tens to hundreds of surfactant monomers, and collectively can be utilized as nano-sized ion exchangers to assist with ultrafiltration separation (i.e., removal) of anionic pollutants from natural waters or wastewaters. Target anionic pollutants include nitrate, phosphate, arsenate and chromate. However, most polluted waters contain a complex mixture of anions, with these different anions competing for the micellar pseudo-phase, thus potentially reducing the overall removal efficiency of the target anions.Further, loss of surfactant monomers through the membrane also reduces process efficiency as replenishment of surfactant over time is required. In this review, the existing research on inorganic anion removal by micellar enhanced ultrafiltration (MEUF) and similar processes

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“…Simple models that describe ion exchange on resins and ionic membranes have been reported widely, − with the basic theory concerning ion exchange first developed by Helmholtz in 1879 . Helmholtz envisioned all counterions as being lined parallel to the charged surface at a distance approximately equal to the ionic diameter, and with the potential decreasing linearly to zero within a short distance from the surface.…”

Section: Theorymentioning

confidence: 99%

Anion Exchange on Cationic Surfactant Micelles, and a Speciation Model for Estimating Anion Removal on Micelles during Ultrafiltration of Water

Chen

Jafvert

2017

Langmuir

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Surfactant micelles combined with ultrafiltration can partially, or sometimes nearly completely, separate various ionic and nonionic pollutants from water. To this end, the selectivity of aqueous micelles composed of either cetyltrimethylammonium (CTA) bromide or cetylpyridinium (CP) chloride toward many environmentally relevant anions (IO, F, Cl, HCO, NO, Br, NO, HPO, HPO, SO, and CrO) was investigated. Selectivity coefficients of CTA micelles (with respect to Br) and CP micelle (with respect to Cl) for these anions were evaluated using a simple thermodynamic ion exchange model. The sequence of anion affinity for the CTA micelles and for the CP micelles were the same, with decreasing affinity occurring in the order of: CrO > SO > HPO > NO > Br > NO > Cl > HCO > HPO ≈ F. From the associated component mass balance and ion exchange (i.e., mass action) equations, an overall speciation model was developed to predict the distribution of all anions between the aqueous and micellar pseudophase for complex ionic mixtures. Experimental results of both artificial and real surface waters were in good agreement to model predictions. Further, the results indicated that micelles combined with ultrafiltration may be a potential technology for nutrient and other pollutant removal from natural or effluent waters.

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Modification of the AMX membrane surface: Temperature dependence of anion exchange equilibrium

Cited by 7 publications

References 35 publications

Ion Exchange Equilibrium between DOWEX 1X8 Resin Modified by Polyethyleneimine and Electrolyte Solutions

Ion Exchange Equilibrium between DOWEX 1X8 Resin Modified by Polyethyleneimine and Electrolyte Solutions

Inorganic anion removal using micellar enhanced ultrafiltration (MEUF), modeling anion distribution and suggested improvements of MEUF: A review

Anion Exchange on Cationic Surfactant Micelles, and a Speciation Model for Estimating Anion Removal on Micelles during Ultrafiltration of Water

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