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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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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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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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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Ionic Dendrimer Based Polyamide Membranes for Ion Separation.

Ze-Lin Qiu1, Li-Feng Fang1, Yu-Jie Shen1

  • 1Key Laboratory of Macromolecule Synthesis and Functionalization (Ministry of Education), ERC of Membrane and Water Treatment (Ministry of Education), Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.

ACS Nano
|March 29, 2021
PubMed
Summary
This summary is machine-generated.

This study developed advanced polyamide membranes using ionic polyamidoamine dendrimers for precise separation of low/high-valent ions. These membranes offer high selectivity and chemical cleaning tolerance, crucial for environmental and energy applications.

Keywords:
charged nanochannelion sieving/transport mechanismionic polyamidoamine dendrimerlow/high-valent ion separationpolyamide membrane

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Area of Science:

  • Materials Science
  • Separation Science
  • Nanotechnology

Background:

  • Separating ions based on valence and size is critical for environmental, healthcare, chemical, and energy applications.
  • Achieving high separation precision necessitates membranes with superior ion selectivity.
  • Current methods face challenges in effectively distinguishing between ions of varying valency and size.

Purpose of the Study:

  • To engineer polyamide (PA) membranes with enhanced ion selectivity for low/high-valent ion separation.
  • To create well-defined nanochannels within PA membranes using ionic polyamidoamine (PAMAM) dendrimers.
  • To investigate the separation mechanisms, including steric, dielectric exclusion, and Donnan effects.

Main Methods:

  • Incorporation of ionic PAMAM dendrimers into PA membranes via interfacial polymerization.
  • Fabrication of defect-free PA nanofilms with controlled dendrimer distribution.
  • Analysis of ion sieving and transport using the Donnan steric pore model with dielectric exclusion.

Main Results:

  • Successfully formed PA membranes with internal and external nanochannels via PAMAM dendrimer incorporation.
  • Achieved high selectivity for low/high-valent co-ions due to tunable ionizable groups in external nanochannels.
  • Demonstrated defect-free nanofilms with sub-10 nm dendrimer sizes contributing to efficient water transport and ion separation.

Conclusions:

  • Ionic PAMAM dendrimers are effective in creating highly selective PA membranes for precise ion separation.
  • The developed membranes exhibit excellent low/high-valent ion selectivity and robustness against chemical cleaning.
  • The study provides insights into nanochannel design for advanced membrane-based separation technologies.