The Effect of Valence on the Ion-Exchange Process: Theoretical and Experimental Aspects on Compound Binding/Release

Hänninen, Kaisa; Murtomäki, Lasse; Kaukonen, Ann Marie; Hirvonen, Jouni

doi:10.1002/jps.20729

Cited by 11 publications

(7 citation statements)

References 26 publications

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“…Ion exchange is a process by which the counterions associated with bound charges in a gel (or other substrate) are replaced by like-charged ions. , Situations giving rise to ion exchange can include differences in the affinity of different ions for the sites of adsorption or a higher concentration of the replacing ion . Efforts to take up monovalent species from aqueous solution pose a particular challenge because the binding ability of such ions is typically weak in comparison to multivalent ions of the same charge .…”

Section: Resultsmentioning

confidence: 99%

“…40,41 Situations giving rise to ion exchange can include differences in the affinity of different ions for the sites of adsorption or a higher concentration of the replacing ion. 42 Efforts to take up monovalent species from aqueous solution pose a particular challenge because the binding ability of such ions is typically weak in comparison to multivalent ions of the same charge. 43 The gels considered in this work represent a special case because they were formed by an acid−base interaction, leaving the composition relatively free of counterions within the gel structure.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Novel Hemicellulose–Chitosan Biosorbent for Water Desalination and Heavy Metal Removal

Ayoub

Venditti

Pawlak

et al. 2013

ACS Sustainable Chem. Eng.

126

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Hemicellulose material is an abundant and relatively under-utilized polymeric material present in lignocellulosic materials. In this research, an alkaline treatment was applied to pinewood (PW), switchgrass (SG), and coastal bermuda grass (CBG) in order to extract hemicelluloses to subsequently produce a novel biosorbent. Alkaline extraction at 75 °C recovered 23% of the biomass as a predominantly hemicellulose material with a number average degree of polymerization of ∼450. These hemicelluloses were grafted with penetic acid (diethylene triamine pentaacetic acid, DTPA) and were then cross-linked to chitosan. The effects of hemicellulose−DTPA concentration, reaction time, and temperature of reaction with chitosan on the resulting salt (sodium chloride, NaCl) uptake and weight loss in saline solutions were determined. A maximum salt uptake for the materials was ∼0.30 g/g of foam biosorbent. The foam biosorbent was characterized by FT-IR spectra, porosity, and dynamic mechanical analysis. Batch adsorption equilibrium results suggest that the adsorption process for salt follows a second-order kinetic model. The hemicellulose-DTPA-chitosan foam biosorbent had uptakes of 2.90, 0.95, and 1.37 mg/g of Pb 2+ , Cu 2+ , and Ni 2+ ions, respectively, from aqueous medium at initial concentrations of 5000 PPB at pH 5. The cross-linked hemicellulose−DTPA− chitosan material has good potential for environmental engineering applications.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Novel Hemicellulose–Chitosan Biosorbent for Water Desalination and Heavy Metal Removal

Ayoub

Venditti

Pawlak

et al. 2013

ACS Sustainable Chem. Eng.

126

View full text Add to dashboard Cite

show abstract

“…There has been recent research both on the effect of fi ber structure on loading capability and on the release profi les of ionexchange fi bers. [37][38][39] Martineau et al have described a medicated, multilayered polyurethane foam dressing and drug delivery device with cooling properties used in body cavities and damaged tissues. 40 Zhu et al investigated acyclovir-loaded PAN hollow fi bers prepared by dry-wet spinning processes for the preparation of TDDSs.…”

Section: Transdermal Dds (Tdds)mentioning

confidence: 98%

Drug delivery systems using biotextiles

Zhu

2013

Biotextiles as Medical Implants

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“…According to the Donnan theory and the simplifying assumptions made in this work (ideal liquid mixtures, no osmotic effect), divalent ions should be more excluded than univalent ions. 42 This is because, given the Donnan potential between the solution and the resin phase, the electrical force acting on a divalent anion is twice that acting on a monovalent one.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Ion Exclusion Chromatography: Model Development and Experimental Evaluation

Lodi

Storti

Pellegrini

et al. 2017

Ind. Eng. Chem. Res.

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Ion exclusion chromatography (IEC) is a separation technique used both at analytical scale for the simultaneous determination of ionic species and at preparative scale for the separation of strong electrolytes from weak electrolytes and nonelectrolytes. In this work, a column model for IEC is developed and evaluated by comparison with experimental data. The model explicitly takes into account the Donnan equilibria responsible for the exclusion of electrolytes from the resin pores. At the high electrolytes concentrations typical of preparative scale separations, resin shrinking becomes an important factor, affecting the variation of inter-and intraparticle void fractions. The effect of the electrolytes concentration on resin shrinking has been experimentally studied, and the volumes variation was included in the model equations. At the analytical scale, the proposed model is able to predict the effect of electrolytes concentration on the extent of exclusion from the resin pores and the influence of the degree of dissociation of weak electrolytes on their retention time. At preparative conditions, discrepancies between the experimental data and simulations results are observed for divalent salts. Since such discrepancies arise at the largest concentrations, they have been imputed to the main model assumption of ideal thermodynamics.

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The Effect of Valence on the Ion-Exchange Process: Theoretical and Experimental Aspects on Compound Binding/Release

Cited by 11 publications

References 26 publications

Novel Hemicellulose–Chitosan Biosorbent for Water Desalination and Heavy Metal Removal

Novel Hemicellulose–Chitosan Biosorbent for Water Desalination and Heavy Metal Removal

Drug delivery systems using biotextiles

Ion Exclusion Chromatography: Model Development and Experimental Evaluation

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