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Related Concept Videos

Ion Exchange01:17

Ion Exchange

630
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...
630
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

641
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...
641
Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

712
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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Dialysis01:15

Dialysis

754
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...
754
Coagulation01:06

Coagulation

348
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
348

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Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
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Recoverable cellulose composite adsorbents for anionic/cationic dyes removal.

Airong Xu1, Yiming Gong1, Qingqing Sun1

  • 1School of Chemical Engineering & Pharmaceutics, Henan University of Science and Technology, Luoyang, Henan 471003, PR China.

International Journal of Biological Macromolecules
|March 15, 2023
PubMed
Summary

Environmentally friendly graphene oxide/hydroxyethyl cellulose/poly(ethylene glycol) diglycidyl ether/Fe3O4 magnetic composites were fabricated. These materials show efficient adsorption of both anionic and cationic dyes, offering potential for wastewater purification.

Keywords:
CelluloseDye removalGraphene oxideMagnetic composite

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Wastewater contamination by cationic and anionic dyes poses environmental challenges.
  • Developing efficient, eco-friendly adsorbents is crucial for dye removal.

Purpose of the Study:

  • To fabricate and characterize graphene oxide/hydroxyethyl cellulose/poly(ethylene glycol) diglycidyl ether/Fe3O4 (GO/HEC/PGDE/Fe3O4) magnetic composites.
  • To investigate the adsorption performance of these composites for cationic (MB, CV) and anionic (AB-25) dyes.
  • To explore the influence of graphene oxide content and adsorption conditions on dye removal efficiency.

Main Methods:

  • Fabrication of GO/HEC/PGDE/Fe3O4 magnetic composites.
  • Systematic adsorption experiments with varying GO content and conditions.
  • Analysis using kinetic, isotherm, and thermodynamic models to understand adsorption mechanisms.

Main Results:

  • Increased GO content significantly enhanced the adsorption capacity of the GO/HEC/PGDE/Fe3O4 composites for both anionic and cationic dyes.
  • Adsorption behavior was elucidated through kinetic, isotherm, and thermodynamic modeling.
  • The composites demonstrated easy fabrication, eco-friendliness, efficient dye adsorption, and reusability.

Conclusions:

  • GO/HEC/PGDE/Fe3O4 magnetic composites are effective adsorbents for a wide range of dyes.
  • The material's properties, including ease of separation and reusability, make it a promising candidate for industrial wastewater treatment applications.