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Related Concept Videos

Dialysis01:15

Dialysis

1.1K
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...
1.1K
Ion Exchange01:17

Ion Exchange

781
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...
781
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

1.1K
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...
1.1K
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

1.2K
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...
1.2K
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

728
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,...
728
Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

5.8K
Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
5.8K

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Related Experiment Video

Updated: Nov 9, 2025

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device

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Ion-capture electrodialysis using multifunctional adsorptive membranes.

Adam A Uliana1,2, Ngoc T Bui2,3, Jovan Kamcev4

  • 1Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, USA.

Science (New York, N.Y.)
|April 16, 2021
PubMed
Summary

New adsorptive membranes enable efficient, one-step water purification. This ion-capture electrodialysis process simultaneously removes salts and toxic contaminants from complex water sources.

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An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter
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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Chemical Engineering

Background:

  • Rising global demand for clean water necessitates advanced purification technologies.
  • Conventional water treatment involves multiple costly separation units for desalination and contaminant removal.
  • Existing methods struggle with simultaneous removal of diverse contaminants like heavy metals and boron.

Purpose of the Study:

  • To develop efficient and selective adsorptive membranes for water purification.
  • To demonstrate a one-step separation strategy for simultaneous desalination and contaminant capture.
  • To address the limitations of current water treatment technologies.

Main Methods:

  • Fabrication of robust, selective, and tunable adsorptive membranes with embedded porous aromatic framework nanoparticles within ion exchange polymers.
  • Implementation of ion-capture electrodialysis using these adsorptive membranes in specialized configurations.
  • Testing the membranes' ability to simultaneously desalinate and capture target solutes from complex water sources.

Main Results:

  • Demonstrated efficient, one-step separation of complex water sources.
  • Achieved simultaneous desalination and capture of diverse target solutes.
  • Exhibited negligible capture of competing ions, highlighting selectivity.
  • Showcased the robustness and tunability of the developed adsorptive membranes.

Conclusions:

  • The developed adsorptive membranes and ion-capture electrodialysis offer a promising multifunctional separation strategy.
  • This approach significantly enhances the efficiency of purifying nontraditional water sources.
  • The technology is applicable for developing advanced, selective water treatment solutions.