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Related Concept Videos

Dialysis01:15

Dialysis

570
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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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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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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Loose Polyester Nanofiltration Membrane Designed with Hydroxyl-Ammonium for Efficient Dye/Salt Separation.

Nan Ma1, Guiliang Li1, Yang Liu1

  • 1Zhejiang International Joint Laboratory of Advanced Membrane Materials & Processes, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, No. 1219 Zhongguan West Road, Ningbo 315201, China.

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|February 25, 2025
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Summary

A new loose nanofiltration membrane efficiently separates dyes from salts in industrial wastewater. This membrane offers high selectivity and stability, crucial for the dye synthesis industry.

Keywords:
dye separationinorganic saltsloose networkmonomer designpolyester nanofiltration membrane

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Efficient dye and salt separation is critical for the dye synthesis industry.
  • Nanofiltration (NF) membrane technology faces challenges in achieving high selectivity for dye/salt mixtures.

Purpose of the Study:

  • To develop a novel loose NF membrane for efficient dye/salt separation.
  • To investigate the performance and stability of the fabricated membrane in dye synthesis wastewater.

Main Methods:

  • Fabrication of a loose polyester NF membrane using interfacial polymerization.
  • Utilized "hydroxyl-ammonium" biquaternary diethanolamine (MDET) and trimesoyl chloride.
  • Evaluated membrane performance in terms of dye rejection, salt passage, stability, and antifouling properties.

Main Results:

  • The novel MDET-based membrane demonstrated high rejection of dyes and passage of monovalent/divalent salt ions.
  • Achieved exceptional filtration efficiency and high selectivity in dye solutions.
  • Exhibited excellent operational stability (>100 h), superior antifouling properties, and high chlorine resistance.

Conclusions:

  • The developed loose NF membrane offers a promising solution for efficient dye/salt separation in the dye synthesis industry.
  • The molecular design of MDET contributes to a loose crosslinking network, enhancing filtration performance.
  • The study provides insights into ion and dye behavior during desalination processes in this sector.