Transport properties of electrodialysis membranes in the presence of Zn2+ complexes with Cl−

Aouad, Fouad

doi:10.1016/s0376-7388(96)00212-8

Cited by 25 publications

(13 citation statements)

References 7 publications

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“…Aouad et al reported the selective transport of the anion complex between zinc ion and chloride ion through an anion-exchange membrane under a potential gradient. 10 Takahashi and Kikuchi reported a selective enrichment of copper (IT) ion rather than cobalt ion in electrodialysis across a cation-exchange membrane under the presence of EDTA (ethylenediaminetetraacetic acid) in the feed solution. 11 The dialysis study has been also reported for selective transport of ammonia through a cation-exchange membrane using silver ion as the carrier and that of boric acid through an anion-exchange membrane using hydroxide ion as the carrier.…”

Section: Methodsmentioning

confidence: 99%

Selective Transport of Heavy Metal Ions across a Cation-Exchange Membrane with a Chelating Agent in the Receiving Phase

Igawa¹,

Narita²,

Okochi³

2002

Bulletin of the Chemical Society of Japan

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Heavy metal ions can be selectively transported under the concentration gradient across a cation-exchange membrane with a chelating agent in the receiving phase. The selectivity depends on the complex formation constants of the ions with the agent. Metal ions are adsorbed into a cation-exchange membrane via the ion-exchange reaction and diffuse across the membrane. The desorption process is facilitated by the complexation in the receiving phase, which causes a large transport rate across the membrane. A transport equation was established and the theoretical values estimated by the equation and the permeation characteristics values obtained experimentally agreed well with the measured ion· flux. The selectivity of the metal ions in the mixed solution is increased in the adequate concentration of the chelating agent in the receiving phase, when the chelate formation reaction may occur competitively between the ions with the agent in the receiving phase. The metal ions in the complex solution can be stripped as free ions across a cation-exchange membrane via the ion-exchange reaction with protons under a concentration gradient of acid.heavy metal ions were selectively transported efficiently and the anions, the chelate and the chelating agent, were not backtransported to the feed solution across the cation-exchange membrane.In this paper, we will report the permeation characteristics of the ions in the system, the transport equation, the mutual separation between heavy metal ions, and the recovery of the metal ions as free ions from the complex solution.

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Section: Methodsmentioning

confidence: 99%

Selective Transport of Heavy Metal Ions across a Cation-Exchange Membrane with a Chelating Agent in the Receiving Phase

Igawa¹,

Narita²,

Okochi³

2002

Bulletin of the Chemical Society of Japan

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“…The anionic membranes used were all commercially available: AW and ARA from Solvay, France, Raipore 5035 and Raipore 6030 from Pall, UK, and ACS and AFN7 from Tokuyama, Japan. The AW, ARA, ACS and AFN7 membranes have been used in several ED studies and their characteristics such as ionic exchange capacity, water content, transport number and nature of ionic sites can be found in the literature [25][26][27][28][29]. The Raipore membranes 5035 and 6030 are for the separation of acids with low proton leakage.…”

Section: Methodsmentioning

confidence: 99%

Comparison of anionic membranes used to concentrate nitric acid to beyond the azeotropic mixture

Ponce-de-León

Field

2000

Journal of Membrane Science

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The electrolysis of concentrated nitric acid solutions was carried out in an electrochemical cell with parallel plates (FM01-LC ICI). An anionic membrane that permits the migration of nitrate ions under the influence of an electrical field separated the anodic and cathodic compartments. The current efficiency for the transported nitrate ions was evaluated for several membranes, at a constant current. All the membranes allowed the transport of nitrate ions at different current efficiencies, following the increase in acid concentration in the anodic compartment. This electroseparation membrane process concentrated nitric acid from 25% up to 90% in successive stages. A special case to be noted was when the acid concentration was near the azeotropic value. In this case, the acid concentration in the anodic compartment rose above the azeotropic value of 68.5%, thus breaking the azeotrope mixture. It is expected that, for some niche applications, this process could be competitive with extractive distillation.

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“…In a previous study (Aouad et al, 1997), the transport of Cl À by an anionic exchange membrane (AEM) was reduced in the presence of zinc complexes, while the flow of Na þ cations was increased, suggesting that complexes of a certain type neutralize part of the fixed sites of the membrane. The rate of complexes in relation to the free ions is important for transport through membranes, as well as the concentration of the species and the pH values of the solution (Huang et al, 1988;Aouad et al, 1999Aouad et al, , 1997.…”

Section: Introductionmentioning

confidence: 91%

“…In addition, the presence of complexes can increase the resistance of the membranes. Complexes located in the interior of the matrix can result in interactions with sites of the membrane and alter its permselectivity (Aouad et al, 1999(Aouad et al, , 1997.…”

Section: Introductionmentioning

confidence: 99%

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Treatment of wastewaters from cyanide-free plating process by electrodialysis

Scarazzato

Buzzi

Bernardes

et al. 2015

Journal of Cleaner Production

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Transport properties of electrodialysis membranes in the presence of Zn2+ complexes with Cl−

Cited by 25 publications

References 7 publications

Selective Transport of Heavy Metal Ions across a Cation-Exchange Membrane with a Chelating Agent in the Receiving Phase

Selective Transport of Heavy Metal Ions across a Cation-Exchange Membrane with a Chelating Agent in the Receiving Phase

Comparison of anionic membranes used to concentrate nitric acid to beyond the azeotropic mixture

Treatment of wastewaters from cyanide-free plating process by electrodialysis

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