ion exchange

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an·i·on ex·change

(an'ī-on eks-chānj'),
The process by which an anion in a mobile (liquid) phase exchanges with another anion previously bound to a solid, nonmobile, positively charged phase, the latter being an anion exchanger. For example, the process takes place when Cl- is exchanged for OH- in desalting. The reaction is Cl- (in solution) + (OH- on anion exchanger+) → (Cl- on anion exchanger) + OH- (in solution); in combination with the cation exchange, NaCl is removed from solution. Anion exchange may also be used chromatographically, to separate anions, and, medicinally, to remove an anion (for example, Cl-) from gastric contents or bile acids in the intestine.

ion-ex·change chro·ma·tog·ra·phy

(ī'on-eks-chānj' krō'mă-tog'ră-fē)
Chemical investigation in which cations or anions in the mobile phase are separated by electrostatic interactions with the stationary phase.
See also: anion exchange, cation exchange

cat·i·on ex·change

(kat'ī-on eks-chānj')
The process by which a cation in a liquid phase exchanges with another cation present as the counter-ion of a negatively charged solid polymer (cation exchanger). Cation exchange may be used chromatographically, to separate cations, and medicinally, to remove a cation.
See also: anion exchange

an·i·on ex·change

(an'ī-on eks-chānj')
The process by which an anion in a mobile (liquid) phase exchanges with another anion previously bound to a solid, positively charged phase, the latter being an anion exchanger. Anion exchange may also be used chromatographically, to separate anions, and medicinally, to remove an anion (e.g., Cl-) from gastric contents or bile acids in the intestine.

ion exchange

A reversible chemical reaction in which ions in a solution are replaced by others with like charge from an insoluble solid such as an ION EXCHANGE RESIN. The process is used for softening hard water, purifying sugar, separating radioactive isotopes and for other purposes.
References in periodicals archive ?
The washed product was finally freeze-dried with lyophilizer to obtain the alkaline anion exchange membranes.
Abbreviations: AEM, anion exchange membrane; CIE, Commission Internationale de l'Eclairage.
Contributions then discuss alkaline fuel cells bearing anion exchange membranes, proton exchange membranes and catalytic support materials, anode catalysts in direct alcohol fuel cells, membrane materials for direct methanol fuel cells, hydroxide exchange membranes, microbial fuel cells and bioelectrochemistry, microfluidics, and electrocatalysts in direct alcohol cells.
Patton for their poster on "Synthesis and Characterization of Crosslinked, Quaternary Ammonium Polybenzoxazines for Anion Exchange Membranes."
Topics addressed include small community integrated water resources supply and recycling, recycling and reuse of high purity water from semiconductor integrated circuits manufacturing processes, cleaner production by using electrodialysis in organic or aqueous-organic systems, recovery and recycling of waste acids from industrial spent liquors using diffusion dialysis with new series of anion exchange membranes, improving resource cascading, environmental impacts of oil shale and coal electricity, strategies for reducing carbon dioxide emissions in rural communities of Botswana, the impact of economic incentives on recycling behavior, ulta-compact biofilm reactors for wastewater treatment and recovery, and decision support systems for material recovery and energy production.
Zhang, "Highly stable pyridinium-functionalized cross-linked anion exchange membranes for all vanadium redox flow batteries," Journal of Power Sources, vol.
Nanoporous films and anion exchange membranes will be considered as an alternative to expensive proton conductive membrane-Nafion.
After an introduction to types of fuel cells, applications, the fundamental materials of PEM fuel cells, membranes for PEM fuel cells, and testing, chapters cover fluoropolymers for proton exchange membranes, nonfluorinated polymers for proton exchange membranes, anhydrous proton-conducting polymers for high-temperature PEM fuel cells, anion exchange membranes for alkaline fuel cells, and polymers for new types of fuel cells.
Anion exchange membranes have been used in the field to measure N[O.sup.-.sub.3] fluxes in soils of grass hay crops.