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Adsorption isotherm models for basic dye adsorption by peat in single and binary component systems.

S J Allen1, G McKay, J F Porter

  • 1School of Chemical Engineering, Queen's University Belfast, Belfast, UK. s.allen@qub.ac.uk

Journal of Colloid and Interface Science
|November 10, 2004
PubMed
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This study investigated dye adsorption onto peat, finding the Redlich-Peterson model best describes single-dye systems. Predicting mixed-dye adsorption proved challenging due to complex interactions.

Area of Science:

  • Environmental Science
  • Water Treatment
  • Adsorption Science

Background:

  • Textile industry effluents pose significant environmental pollution challenges.
  • Effective dye removal strategies are crucial for water resource protection.
  • Predicting dye adsorption is vital for designing efficient treatment systems.

Purpose of the Study:

  • To evaluate the adsorption capacity of peat for three basic dyes.
  • To determine the best-fitting isotherm model for single-component dye adsorption.
  • To assess the applicability of models for predicting binary dye adsorption.

Main Methods:

  • Sorption isotherms for Basic blue 3, Basic yellow 21, and Basic red 22 on peat were measured.
  • Experimental data were fitted using Langmuir, Freundlich, Redlich-Peterson, Tempkin, and Toth isotherm equations.

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  • Error analysis was performed to identify the most accurate isotherm models.

    • Main Results:

    • Equilibrium sorption was achieved after 21 days.
    • The Redlich-Peterson model, particularly with nonlinear error functions, best described single-component dye adsorption.
    • An extended Langmuir model showed limited success in predicting binary dye adsorption.

    Conclusions:

    • Peat demonstrates potential as an adsorbent for basic dyes.
    • The Redlich-Peterson model is highly effective for characterizing single-dye adsorption onto peat.
    • Binary dye adsorption is complex and requires further investigation beyond simple models.