Kinetic studies for sorption of amino acids using a strong anion-exchange resin

Moreira, Maria João A.; Ferreira, L.M.

doi:10.1016/j.chroma.2005.02.017

Cited by 12 publications

(5 citation statements)

References 12 publications

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“…Besides, the increase in ionic strength can cause a large amount of electrolytes surrounding the adsorbent surface, which may hinder the accessibility of arsenate to the active sites of surface. A similar observation that ionic strength caused a great reduction in the diffusivity for adsorption of amino acids with an anion-exchange resin was found by Moreira and Ferreira [30]. On the other hand, the uptake of arsenate is greatly suppressed at higher ionic strengths.…”

Section: Adsorption Isothermsupporting

confidence: 51%

Enhanced adsorption of arsenate onto a natural polymer-based sorbent by surface atom transfer radical polymerization

Wei

Zheng

Chen

2011

Journal of Colloid and Interface Science

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Section: Adsorption Isothermsupporting

confidence: 51%

Enhanced adsorption of arsenate onto a natural polymer-based sorbent by surface atom transfer radical polymerization

Wei

Zheng

Chen

2011

Journal of Colloid and Interface Science

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“…In previous work, using simulant leachate, there was not significant evidence of a two-stage breakthrough process [29]. However, the ionic strength of the inlet was much greater in this work (554 and 605 mmol L −1 in these experiments verses 24.8 mmol L −1 for the simulant leachate), which is likely to have retarded the adsorption kinetics [47].…”

Section: La-mts9501 Column-loading Behaviourcontrasting

confidence: 62%

Development of a Combined Leaching and Ion-Exchange System for Valorisation of Spent Potlining Waste

Robshaw

Bonser

Coxhill

et al. 2020

Waste Biomass Valor

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This work aims to contribute to addressing the global challenge of recycling and valorising spent potlining; a hazardous solid waste product of the aluminium smelting industry. This has been achieved using a simple two-step chemical leaching treatment of the waste, using dilute lixiviants, namely NaOH, H 2 O 2 and H 2 SO 4 , and at ambient temperature. The potlining and resulting leachate were characterised by spectroscopy and microscopy to determine the success of the treatment, as well as the morphology and mineralogy of the solid waste. This confirmed that the potlining samples were a mixture of contaminated graphite and refractory materials, with high variability of composition. A large quantity of fluoride was solublised by the leaching process, as well as numerous metals, some of them toxic. The acidic and caustic leachates were combined and the aluminium and fluoride components were selectively extracted, using a modified ion-exchange resin, in fixed-bed column experiments. The resin performed above expectations, based on previous studies, which used a simulant feed, extracting fluoride efficiently from leachates of significantly different compositions. Finally, the fluoride and aluminium were coeluted from the column, using NaOH as the eluent, creating an enriched aqueous stream, relatively free from contaminants, from which recovery of synthetic cryolite can be attempted. Overall, the study accomplished several steps in the development of a fully-realised spent potlining treatment system. Graphic Abstract

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“…In conclusion, the experimental trends of Figures 3 and 5 can be explained qualitatively taking into account the ionic nature of both the amino acid and the membrane fixed groups, although a quantitative theoretical analysis could require the consideration of the short-range interactions between the amino acid, the water molecules, and the membrane thiol chains. 18,19,28,[50][51][52][53][54][55][56][57] It is also likely that not only the bulk diffusion through the membrane but also the interfacial kinetics might play a role on the amino acid transport; 20,21,[26][27][28][29]47,51 therefore, the simple Donnan equilibrium assumed here could not be valid. Finally, the set of transport equations should be extended to incorporate the hydrogen reaction-diffusion and solved locally to obtain the axial profiles of the concentrations as well as the fluxes.…”

Section: Resultsmentioning

confidence: 99%

pH and Ionic Strength Effects on Amino Acid Transport through Au-Nanotubule Membranes Charged with Self-Assembled Monolayers

Lai

Ileri

et al. 2007

J. Phys. Chem. C

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The transport of the amino acids tyrosine and phenylalanine through Au-nanotubule membranes with selfassembled monolayers of alkanethiols is theoretically and experimentally studied. The membranes are prepared by electroless deposition of gold on porous polycarbonate track-etched membranes with control of the inner pore size, followed by self-assembly of acid-functionalized thiols (final mean average pore radius: 7 nm). The capability of switchable ion-transport selectivity by external control (e.g., by changing the pH, ionic strength, and amino acid concentration) is discussed. The flux changes with the pH and the ionic strength of the solution clearly show that electrical charges play a key role in the amino acid transport through the nanopores. Remarkably, an uphill transport of the amino acid is observed when a pH difference is imposed in the external solutions. The theoretical approach based on the Nernst-Planck flux equations considers all of the charged species present in the system (the cationic, anionic, and zwitterionic forms of the amino acid, the hydrogen and hydroxide ions, and the two salt ions) and allows a qualitative understanding of the transport phenomena in the charged nanopores.

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Kinetic studies for sorption of amino acids using a strong anion-exchange resin

Cited by 12 publications

References 12 publications

Enhanced adsorption of arsenate onto a natural polymer-based sorbent by surface atom transfer radical polymerization

Enhanced adsorption of arsenate onto a natural polymer-based sorbent by surface atom transfer radical polymerization

Development of a Combined Leaching and Ion-Exchange System for Valorisation of Spent Potlining Waste

pH and Ionic Strength Effects on Amino Acid Transport through Au-Nanotubule Membranes Charged with Self-Assembled Monolayers

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