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Related Concept Videos

Ion Exchange01:17

Ion Exchange

1.0K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
889
Dialysis01:15

Dialysis

1.4K
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

2.3K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
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Related Experiment Video

Updated: Dec 17, 2025

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Predicting and Enhancing the Ion Selectivity in Multi-Ion Capacitive Deionization.

Johan Nordstrand1, Joydeep Dutta1

  • 1Functional Materials, Applied Physics Department, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova universitetscentrum, 106 91 Stockholm, Sweden.

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Summary

Capacitive deionization (CDI) can selectively remove ions from water. This study develops a model to predict and enhance ion removal efficiency in CDI systems treating complex water sources.

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Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Electrochemistry

Background:

  • Global potable water scarcity necessitates advanced desalination methods.
  • Capacitive deionization (CDI) shows promise for removing ionic species from saline and brackish water.
  • Natural water sources contain multiple ionic species beyond sodium chloride, posing challenges for desalination.

Purpose of the Study:

  • To investigate how device operation affects the preferential removal of different ionic species in CDI.
  • To develop a theoretical framework for predicting and enhancing selective ion removal in CDI.
  • To demonstrate how selective ion removal can optimize water treatment and reduce post-treatment needs.

Main Methods:

  • Utilized a dynamic Langmuir (DL) model as a theoretical basis.
  • Derived a relationship between adsorption of different ionic species for varying operational times.
  • Validated model predictions with existing literature data.

Main Results:

  • Established a predictive model for selective ion removal in CDI.
  • Demonstrated the ability to enhance preferential removal of specific ions.
  • Showcased how selectivity can minimize over-removal of ions, reducing remineralization requirements.

Conclusions:

  • The developed method aids in predicting the performance of CDI with complex multi-ion water compositions.
  • Improved device operation strategies can be guided by this model for efficient desalination.
  • This approach offers valuable insights for optimizing CDI technology for diverse natural water sources.