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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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 basic...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...

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Related Experiment Video

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Enhanced Photoluminescence of Curcuma longa Extracts via Chitosan-Mediated Energy Transfer for Textile Authentication Applications
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Enhanced Photoluminescence of Curcuma longa Extracts via Chitosan-Mediated Energy Transfer for Textile Authentication Applications

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Low-swelling chitosan derivatives as biosorbents for basic dyes.

George Z Kyzas1, Dimitrios N Bikiaris, Nikolaos K Lazaridis

  • 1Laboratory of General & Inorganic Chemical Technology, Division of Chemical Technology, School of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 28, 2008
PubMed
Summary

Novel chitosan microsphere derivatives were developed as effective biosorbents for basic dye removal. These materials demonstrate high sorption capacity and efficient dye uptake, offering a promising solution for wastewater treatment.

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Polymer Chemistry

Background:

  • Chitosan derivatives are widely explored for dye adsorption.
  • Swelling in powdered chitosan necessitates cross-linking for improved stability.
  • Development of efficient biosorbents is crucial for textile wastewater treatment.

Purpose of the Study:

  • To prepare and characterize novel chitosan microsphere derivatives as sorbents for basic dyes.
  • To investigate the sorption-desorption behavior and mechanism of these biosorbents.
  • To evaluate the performance of the developed materials in removing basic dyes from aqueous solutions.

Main Methods:

  • Preparation of chitosan microspheres via ionic gelation and covalent cross-linking.
  • Characterization using FTIR spectroscopy and SEM.
  • Sorption-desorption experiments across a pH range.
  • Adsorption isotherm (Langmuir) and kinetic (intraparticle diffusion) modeling.
  • Thermodynamic analysis.

Main Results:

  • Maximum sorption capacity of 0.808 mmol/g at 338 K was achieved.
  • Diffusion coefficients ranged from (1-10) x 10(-11) m(2)/s, indicating intraparticle diffusion.
  • The sorption process was found to be spontaneous, endothermic, and increased randomness.
  • Optimal sorption-desorption conditions were determined over the entire pH range.

Conclusions:

  • The novel chitosan microsphere derivatives are effective biosorbents for basic dyes.
  • The cross-linking method successfully addressed swelling issues.
  • The materials show potential for application in dye-contaminated wastewater treatment.