Transport Studies of Monovalent Ions through Nafion-117 Ion Exchange Membrane in Presence of Polyacrylate

Agarwal, Chhavi; Mhatre, Amol; Goswami, A.

doi:10.1080/01496395.2014.940047

Cited by 2 publications

(13 citation statements)

References 20 publications

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“…The result is similar to CsCl-NaPAA system studied earlier. 31 This indicates strong interaction of Mg 2+ ion with the polyacrylate anion. Though divalent, the fraction of Mg 2+ ions bound to the polyacrylate ion (0.66) is comparable to Cs + ions.…”

Section: ■ Theoretical Equationmentioning

confidence: 98%

“…Aldrich make poly(acrylic acid) (M w = 250 000) (PAA) was procured as aqueous solution (35 wt % solution in water). Standardization of PAA solution and subsequent preparation of 0.1 N sodium polyacrylate (NaPAA) stock solution were done as described in ref 31.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…This may appreciably affect the Donnan equilibrium distribution of the cations between the two compartments. In our earlier work, 31 the extent of binding of different monovalent ions (Li + , Na + , and Cs + ) with polyacrylate anion was studied using Donnan membrane equilibrium. The binding of Cs + ions with the polyacrylate anion was found to be stronger relative to Li + and Na + ions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…A modified Nernst−Planck approach has been used to calculate the transport rate of counterions in the presence of polyacrylate and results have been compared with experimental transport kinetics. 31 The dependence of interaction between the polyacrylate and counterion on their concentrations has also been studied based on Donnan membrane equilibria. Results have been qualitatively explained based on the difference in hydration characteristics of the ions.…”

Section: ■ Introductionmentioning

confidence: 99%

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Transport Studies of Divalent Ions through Nafion-117 Ion Exchange Membrane in the Presence of Polyacrylate

Agarwal

Mhatre

Goswami

2015

Ind. Eng. Chem. Res.

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The effect of binding of divalent ions (Mg 2+ and Ba 2+ ) with a polyacrylate anion on the Donnan membrane equilibrium distribution and the transport kinetics have been studied using Nafion-117 membrane. The extent of association of the divalent counterions with polyacrylate has been ascertained from the deviation from Donnan membrane equilibrium condition. The equilibrium concentrations of ions in polyacrylate compartment have been found to be in excess of expected equilibrium concentrations obtained from Donnan membrane equilibrium condition. This has been attributed to higher electrostatic interactions of divalent ions with the polyacrylate backbone compared to the monovalent ions. The strength of binding has been found to depend on the nature of divalent ion. Precipitation has been observed for Ba 2+ , thereby changing the total salt concentration of the polyacrylate compartment. Also, the strength of counterion binding has been found to depend on salt concentrations of the two compartments. The rate of transport of the ions with polyacrylate in the receiver solution has been calculated based on modified Nernst−Planck (NP) approach. The calculated transport kinetics have been found to agree with the experimental transport kinetics. ■ INTRODUCTIONIon-exchange membranes are permselective, allowing the passage of counterions while excluding co-ions. This phenomenon is called Donnan exclusion. It depends on the charge on the co-ion and concentration of the ions in the solution as well as in the membrane. Ion-exchange membranes are widely used in Donnan dialysis, electrodialysis and as polymer electrolyte membranes in fuel cells. 1 The Donnan dialysis process is ecofriendly where the separation of metal ions and charged organic species is achieved based on the differences in solution concentrations and volume of the feed and receiver solutions. 2−11 In Donnan dialysis, selective preconcentration and recovery can be achieved only for ions of different valences. 12 This poor selectivity is a major disadvantage of the process. In order to overcome this problem, a chemical reagent selective to analyte ion is introduced in the feed or the receiving solution. This may alter the free metal ion concentrations, thereby altering the Donnan membrane equilibrium condition as well as the kinetics of transport of a metal ion. This is called as chemically facilitated Donnan dialysis (CFDD). 7,12 The effectiveness of this process depends on the nature and the strength of binding of the metal ion with the complexing agent.Polyelectrolytes are water-soluble polymers with ionizable functional groups. 13,14 These polymers find immense applications in the field of biology, medicine, and cosmetics and the food industry. 15 Virtually all physicochemical properties of polyelectrolyte systems such as electrophoretic mobility, diffusion, and viscosity depend on the interactions between the polyanion chains and the counterions present in the solution. These interactions mainly depend on the nature of the functional groups on the polymer bac...

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Section: ■ Theoretical Equationmentioning

confidence: 98%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Transport Studies of Divalent Ions through Nafion-117 Ion Exchange Membrane in the Presence of Polyacrylate

Agarwal

Mhatre

Goswami

2015

Ind. Eng. Chem. Res.

Self Cite

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“…However, these membranes have limited the development and use of divided cells due to their high costs. Nafion is manufactured from copolymers of tetrafluoroethylene and perfluorinated monomers and has been widely used for ion exchange in separation [26,27], electrochemical [28,29], electrodialysis, and dialysis [5,30] processes. In Fentonbased processes, the commercial Nafion 117® membrane allows the exchange of protons due to its high conductivity and supports the system electroneutrality state and the redox reactions required, by reducing the pH in the electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Technical–Economic Analysis of Hydrogen Peroxide Activation by a Sacrificial Anode: Comparison of Two Exchange Membranes

et al. 2021

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Divided electrochemical reactors allow the design of strategies to take advantage of the two reactions of the redox pair involved for wastewater treatment. Nafion membranes are the most used separators in these cells. These membranes have demonstrated high efficiency, but their high costs make the process more expensive. The present work focuses on the evaluation of the technical and economic feasibility of replacing the Nafion 117® membrane with a commercial polymeric membrane used in reverse osmosis (RO) treatments. In this study, a divided electrochemical cell was constructed with electrodes made of galvanized steel. The Fenton reaction was developed in the anode compartment using electrogenerated iron as a catalyst. An experimental design 2 3 was used to study the influence of three operating parameters (initial H 2 O 2 , membrane, voltage) on the H 2 O 2 activation kinetics. The results demonstrated that the activation of H 2 O 2 followed a pseudo-zero-order kinetic. The maximum rate constants obtained for Nafion 117® and RO membrane were 2.76 mM min −1 and 2.45 mM min −1 , respectively. The optimization of H 2 O 2 activation process was performed using a response surface methodology, where multiple regression models were used to figure out the best operation conditions when using both membranes. Finally, an extensive cost analysis of the process is included.

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Transport Studies of Monovalent Ions through Nafion-117 Ion Exchange Membrane in Presence of Polyacrylate

Cited by 2 publications

References 20 publications

Transport Studies of Divalent Ions through Nafion-117 Ion Exchange Membrane in the Presence of Polyacrylate

Transport Studies of Divalent Ions through Nafion-117 Ion Exchange Membrane in the Presence of Polyacrylate

Technical–Economic Analysis of Hydrogen Peroxide Activation by a Sacrificial Anode: Comparison of Two Exchange Membranes

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