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Detergent Purification of Membrane Proteins01:18

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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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The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Related Experiment Video

Updated: May 2, 2026

Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
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Tannin-assisted interfacial polymerization towards COF membranes for efficient dye separation.

Weishan Deng1, Zezhen Zhang1, Lulu Liu1

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|May 21, 2024
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Summary

This study developed advanced membranes using covalent organic frameworks (COFs) and tannic acid (TA) for efficient water purification. The modified membranes show excellent dye separation and stability, offering a promising solution for clean water access.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Membrane separation is crucial for clean water production.
  • Covalent organic frameworks (COFs) offer tunable properties for advanced membranes.
  • Polyethersulfone (PES) ultrafiltration membranes require modification for enhanced performance.

Purpose of the Study:

  • To develop modified polyethersulfone (PES) ultrafiltration membranes with tannic acid (TA)-assisted covalent organic frameworks (COFs).
  • To enhance membrane hydrophilicity and control COF pore size for improved separation.
  • To evaluate the performance of the modified membranes in dye separation and water purification.

Main Methods:

  • Interfacial polymerization and co-deposition were used to modify PES membranes.
  • n-butanol was employed as an oil-phase monomer to prevent substrate corrosion during interfacial polymerization.
  • Tannic acid (TA) co-deposition introduced hydrophilic groups and facilitated Michael addition reactions for pore size regulation.

Main Results:

  • The optimized membrane exhibited a high permeation flux of 122.03 L m-2 h-1 bar-1.
  • The membrane achieved over 98% retention rate for various dyes (Mw: 300-1300 g mol-1).
  • The modified membranes demonstrated exceptional stability and high retention rates (>98%) even after multiple filtrations.

Conclusions:

  • TA-assisted COF modification significantly enhances membrane hydrophilicity and separation performance.
  • The developed membranes show promising potential for efficient dye separation and water purification applications.
  • The simple rinsing method for the membrane indicates its robustness and long-term applicability.