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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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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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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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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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Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

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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...
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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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Positively Charged Polyamine Nanofiltration Membrane for Precise Ion-Ion Separation.

Zhenyi Zhao1, Nanxi Di1, Zhiyuan Zha1

  • 1School of Chemical Engineering and Technology, Tianjin University, Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, P. R. China.

ACS Applied Materials & Interfaces
|October 5, 2023
PubMed
Summary

This study introduces a novel positively charged nanofiltration membrane for precise ion separation. The new polyamine-based membrane demonstrates high selectivity for separating lithium and magnesium ions, crucial for various industrial applications.

Keywords:
1,3,5-tris(bromomethyl)benzenemonovalent/divalent salt separationnanofiltrationpolyamine membranepositively charged surface

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Conventional nanofiltration (NF) membranes face limitations in ion separation due to negative surface charges.
  • Achieving high ion-ion selectivity is critical for applications like lithium-magnesium separation and water softening.

Purpose of the Study:

  • To develop an advanced, positively charged nanofiltration membrane for precise ion separation.
  • To overcome the performance limitations of traditional polyamide-based membranes.

Main Methods:

  • Interfacial polymerization of polyethylenimine (PEI) and 1,3,5-tris(bromomethyl)benzene (TBB) to create a PEI-TBB selective layer.
  • Fabrication of a composite membrane with ultrathin thickness (~95 nm) and a pore size of 6.5 Å.
  • Characterization of surface charge (zeta potential +20.9 mV at pH 7) and separation performance.

Main Results:

  • The PEI-TBB membrane exhibited a water permeance of 4.2 L·m⁻²·h⁻¹·bar⁻¹.
  • Achieved >90% rejection for various divalent salts and separation factors >15 for NaCl/MgCl₂ and LiCl/MgCl₂.
  • A three-stage NF process reduced the Mg²⁺/Li⁺ mass ratio from 50 to 0.11 with a total separation factor of 455.

Conclusions:

  • The developed polyamine-based NF membrane offers precise ion-ion separation capabilities.
  • Demonstrated excellent operational stability under continuous filtration and high pressure.
  • Shows significant potential for applications requiring selective ion removal and recovery.