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Related Concept Videos

Ion Exchange01:17

Ion Exchange

563
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...
563
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

484
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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Dialysis01:15

Dialysis

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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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Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

2
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Anion-Exchange Membrane Oxygen Separator.

Maisa Faour1, Karam Yassin1,2, Dario R Dekel1,2,3

  • 1The Wolfson Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel.

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Anion-exchange membranes (AEMs) enable a novel electrochemical device for oxygen separation from air. This technology generates high-purity oxygen under mild conditions, offering sustainable on-site generation.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Anion-exchange membranes (AEMs) facilitate high hydroxide anion conductivity in electrochemical systems.
  • AEMs are crucial for fuel cells, electrolyzers, and related technologies.

Purpose of the Study:

  • To introduce a novel electrochemical oxygen separation process utilizing AEMs.
  • To demonstrate a new AEM-based device for generating enriched oxygen from O2/N2 mixtures.

Main Methods:

  • Development and application of a one-dimensional time-dependent, isothermal model.
  • Experimental validation of the AEM-based electrochemical device under mild conditions.

Main Results:

  • Achieved over 96% oxygen purity with a low voltage input.
  • Device operates without liquid electrolytes or sweep gases.
  • Model accurately captures device dynamics and aligns with experimental data.

Conclusions:

  • This AEM-based electrochemical device represents a breakthrough in on-site oxygen generation.
  • The technology offers sustainable solutions for industrial processes and medical applications.
  • Reduced operational complexity and environmental impact are key advantages.