Corrigendum to “Multi component absorption of anions in commercial anion-exchange membranes” [J. Membr. Sci. 301 (2007) 171–179]

Malewitz, Tim; Pintauro, Peter N.

doi:10.1016/j.memsci.2008.04.020

Cited by 2 publications

(4 citation statements)

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“…Although the AMV and AMX membranes are homogeneous, it is shown that the AMV membrane has less macro-porous structure than the AMX membrane. A similar finding has been obtained with the AMV and AMX membranes in the recently published work of Malewitz et al [19] where the membrane microstructure was considered as an array of cylindrical pores of identical radius. By using this model, the average radius of pores in water-equilibrated membranes was found to be 3.3 nm (AMX) and 2.4 nm (AMV), indicating that the AMX membrane contains a greater number of larger pores compared to the AMV membrane.…”

Section: Two-phase Model Of Structure Microheterogeneitysupporting

confidence: 86%

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Permselectivity and microstructure of anion exchange membranes

2008

Journal of Colloid and Interface Science

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Section: Two-phase Model Of Structure Microheterogeneitysupporting

confidence: 86%

“…Recently, the exchange equilibrium isotherm of the AMV and AMX membranes has been reviewed by Malewitz et al [19]. The equilibrium uptake of aqueous NaCl-NaBr and NaCl-NaNO 3 mixtures into AMV and AMX anion-exchange membranes was measured experimentally.…”

Section: Water Content and Sorption Electrolyte In The Membranesmentioning

confidence: 99%

Permselectivity and microstructure of anion exchange membranes

2008

Journal of Colloid and Interface Science

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“…Though selectivity of the PIMs (partition coefficient of the ions at aqueous–membrane interface) is governed by the chemical property of the carrier, the properties of the plasticizer like viscosity and dielectric constant strongly influence transport of the ions across the membrane. ,, The mechanism of solutes (ions/molecules) diffusion across the PIMs may occur through fixed-site jumping, , carrier-diffusion, or mobile-site jumping depending upon the composition of the membrane . In previous work from our laboratory, it was observed that the competition of the anions with the I – ions for available exchange sites of the liquid anion-exchanger trioctylmethylammonium chloride in NPOE plasticized CTA matrix (PIM) was dependent upon the hydration energy of the anions and followed the pattern of the Hofmeister series. , Malewitz et al observed during competitive uptake of the anions in the Neosepta R AMX and Selemion R AMV anion-exchange membranes that the selectivity pattern of anions was NO 3 – > Br – > Cl – . However, the selectivity in anions transport through polymer inclusion membranes facilitated by transition metal containing carriers was found to be dependent not only on their electrostatic interactions but also on the affinity of the carrier toward specific anion…”

Section: Introductionmentioning

confidence: 98%

“…18b,d Malewitz et al observed during competitive uptake of the anions in the Neosepta R AMX and Selemion R AMV anion-exchange membranes that the selectivity pattern of anions was NO 3 À > Br À > Cl À . 23 However, the selectivity in anions transport through polymer inclusion membranes facilitated by transition metal containing carriers was found to be dependent not only on their electrostatic interactions but also on the affinity of the carrier toward specific anion. 24 In the present work, the diffusional transport properties of the PIMs with different compositions have been studied.…”

mentioning

confidence: 99%

Diffusional Transport of Ions in Plasticized Anion-Exchange Membranes

Kumar¹,

Pandey²,

Sharma³

et al. 2011

J. Phys. Chem. B

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Diffusional transport properties of hydrophobic anion-exchange membranes were studied using the polymer inclusion membrane (PIM). This class of membranes is extensively used in the chemical sensor and membrane based separation processes. The samples of PIM were prepared by physical containment of the trioctylmethylammonium chloride (Aliquat-336) in the plasticized matrix of cellulose triacetate (CTA). The plasticizers 2-nitrophenyl octyl ether, dioctyl phthalate, and tris(2-ethylhexyl)phosphate having different dielectric constant and viscosity were used to vary local environment of the membrane matrix. The morphological structure of the PIM was obtained by atomic force microscopy and transmission electron microscopy (TEM). For TEM, platinum nanoparticles (Pt nps) were formed in the PIM sample. The formation of Pt nps involved in situ reduction of PtCl(6)(2-) ions with BH(4)(-) ions in the membrane matrix. Since both the species are anions, Pt nps thus formed can provide information on spatial distribution of anion-exchanging molecules (Aliquat-336) in the membrane. The glass transitions in the membrane samples were measured to study the effects of plasticizer on physical structure of the membrane. The self-diffusion coefficients (D) of the I(-) ions and water in these membranes were obtained by analyzing the experimentally measured exchange rate profiles of (131)I(-) with (nat)I(-) and tritiated water with H(2)O, respectively, between the membrane and equilibrating solution using an analytical solution of Fick's second law. The values of D(I(-)) in membrane samples with a fixed proportion of CTA, plasticizer, and Aliquat-336 were found to vary significantly depending upon the nature of the plasticizer used. The comparison of values of D with properties of the plasticizers indicated that both dielectric constant and viscosity of the plasticizer affect the self-diffusion mobility of I(-) ions in the membrane. The value of D(I(-)) in the PIM samples did not vary significantly with concentration of Aliquat-336 up to 0.5 mequiv g(-1), and thereafter D(I(-)) increased linearly with Aliquat-336 concentration in the membrane. The self-diffusion coefficients of water D(H(2)O) in PIM samples were found to be 1 order of magnitude higher than the value of D(I(-)) and varied slightly depending upon the plasticizer present in the membrane. It was observed in electrochemical impedance spectroscopic studies of the PIM samples that diffusion mobility of NO(3)(-) ions was 1.66 times higher than that of I(-) ions, and diffusion mobility of SO(4)(2-) ions was half of that for I(-) ions. The theoretical interpretation of experimental counterions exchange rate profiles in terms of the Nernst-Planck equation for interdiffusion also showed higher diffusion mobility of NO(3)(-) ions in the PIM than Cl(-), I(-), and ClO(4)(-) ions, which have comparable diffusion mobility.

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Corrigendum to “Multi component absorption of anions in commercial anion-exchange membranes” [J. Membr. Sci. 301 (2007) 171–179]

Cited by 2 publications

References 0 publications

Permselectivity and microstructure of anion exchange membranes

Permselectivity and microstructure of anion exchange membranes

Diffusional Transport of Ions in Plasticized Anion-Exchange Membranes

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