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Ion Exchange01:17

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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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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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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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Ion-Exchange Chromatography01:09

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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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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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Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
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Zwitterion-MOF Functional Interface Enabling Robust Ion and Dye Rejection in Water Filtration.

Arshyn Zhengis1,2, Aigerim Ospanova1,3, Yenglik Amrenova1,4

  • 1Laboratory of Renewable Energy, National Laboratory Astana, Nazarbayev University, 53 Kabanbay Batyr Avenue, Astana 010000, Kazakhstan.

ACS Applied Materials & Interfaces
|November 12, 2025
PubMed
Summary

A novel nanocomposite membrane integrating ZIF-8 and SBMA effectively removes toxic heavy metals and dyes from wastewater. This durable, high-flux membrane shows significant promise for advanced water purification technologies.

Keywords:
ZIF-8dye rejectionheavy metal removalmembrane filtrationsulfobetaine methacrylatezwitterionic materials

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Nanotechnology

Background:

  • Effective removal of heavy metals and dyes from wastewater is crucial for environmental protection.
  • Existing water purification technologies face challenges in efficiency, selectivity, and durability.

Purpose of the Study:

  • To develop a hierarchically engineered nanocomposite membrane for efficient removal of toxic heavy metals and synthetic dyes.
  • To investigate the integration of zeolitic imidazolate framework-8 (ZIF-8) and sulfobetaine methacrylate (SBMA) in a polyacrylonitrile-polyvinylpyrrolidone (PAN-PVP) matrix.
  • To evaluate the membrane's performance, durability, and underlying mechanisms.

Main Methods:

  • Fabrication of a nanocomposite membrane using ZIF-8, SBMA, PAN, and PVP.
  • Performance testing for pure water flux and rejection of heavy metals (Cd, Cu, Pb) and dyes (methyl orange, methylene blue).
  • Durability assessment through continuous cycling.
  • Material characterization using FTIR, SEM, XRD, XPS, and zeta potential.
  • Computational analysis using DFT and MD simulations.

Main Results:

  • The membrane achieved a high pure water flux (71.96 L·m⁻²·h⁻¹).
  • Excellent rejection efficiencies were observed for Cd (95.6%), Cu (93.3%), Pb (97.8%), methyl orange (98.9%), and methylene blue (98.4%).
  • The membrane maintained ~93% of its performance after 10 cycles, demonstrating high durability.
  • Characterization confirmed successful ZIF-8 and SBMA integration and chemical stability.
  • Simulations provided molecular-level insights into contaminant interactions.

Conclusions:

  • The developed ZIF-8/SBMA nanocomposite membrane offers a promising solution for wastewater treatment.
  • The membrane exhibits high flux, selectivity, and robustness for removing diverse contaminants.
  • This work provides a tunable and scalable platform for advanced water purification with mechanistic understanding.