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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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Potentiometry: Membrane Electrodes01:15

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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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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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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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Tailor-Made Heterocharged Covalent Organic Framework Membrane for Efficient Ion Separation.

Yu Zheng1,2, ZhiChao Li1, Zixu Yang1

  • 1Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 5, 2024
PubMed
Summary

This study introduces heterocharged covalent organic framework (COF) membranes for superior ion separation. These membranes precisely control pore size and charge, enhancing heavy metal removal efficiency.

Keywords:
Donnan exclusioncovalent organic framework membraneheterochargedmultivalent ion separationpore size sieving

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Ion separation using membranes is crucial for various applications, including water purification and resource recovery.
  • Traditional polymer membranes struggle to simultaneously control pore size and surface charge, limiting their effectiveness in separating ions, particularly heavy metals.
  • Covalent organic frameworks (COFs) offer tunable properties for advanced membrane applications.

Purpose of the Study:

  • To develop and investigate heterocharged covalent organic framework (COF) membranes for enhanced ion separation.
  • To understand the combined effects of pore size sieving and Donnan exclusion on monovalent and multivalent ion separation.
  • To explore the influence of stacking sequence and quantity of oppositely charged COF nanosheets on membrane performance.

Main Methods:

  • Fabrication of heterocharged COF membranes by assembling ionic COF nanosheets with opposite charges and varying pore sizes.
  • Systematic investigation of the impact of membrane surface charge and pore size on ion separation performance.
  • Analysis of separation mechanisms for anions (pore size sieving dominance) and cations (Donnan exclusion dominance).

Main Results:

  • The heterocharged TpEBr/TpPa-SO3H membrane demonstrated excellent rejection of multivalent anions and cations, including Ni2+, Cd2+, Cr2+, CrO42-, and SeO32-.
  • The membrane's layered structure, with a positively charged upper layer and negatively charged bottom layer, was key to its high performance.
  • The study elucidated the dominant separation mechanisms for different ion types based on membrane characteristics.

Conclusions:

  • Heterocharged COF membranes offer a promising strategy for high-performance ion separation, surpassing limitations of traditional membranes.
  • Precise control over surface charge distribution and pore size engineering in COF membranes is critical for efficient ion rejection.
  • This approach provides valuable insights for designing advanced heterocharged membranes for environmental remediation and resource management.