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Intraparticle diffusion processes during acid dye adsorption onto chitosan.

W H Cheung1, Y S Szeto, G McKay

  • 1Department of Chemical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

Bioresource Technology
|November 18, 2006
PubMed
Summary
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Chitosan effectively adsorbs five acid dyes, with Acid Orange 12 showing the highest capacity. Adsorption primarily follows intraparticle diffusion, influenced by pore size.

Area of Science:

  • Environmental Science
  • Materials Science
  • Polymer Chemistry

Background:

  • Acid dyes are widely used in textile industries, leading to significant water pollution.
  • Chitosan, a biopolymer derived from chitin, is a sustainable and cost-effective adsorbent material.
  • Effective dye removal technologies are crucial for mitigating environmental contamination from industrial effluents.

Purpose of the Study:

  • To investigate the adsorption performance of chitosan for five different acid dyes.
  • To determine the equilibrium adsorption capacities and kinetics of the dye-chitosan systems.
  • To elucidate the predominant adsorption mechanism and the role of pore structure.

Main Methods:

  • Batch adsorption experiments were conducted using chitosan as the adsorbent.

Related Experiment Videos

  • Equilibrium data were analyzed using the Langmuir adsorption model.
  • Adsorption kinetics were evaluated using the intraparticle diffusion model.
  • The influence of pore size on dye diffusion was assessed.

    • Main Results:

    • Chitosan exhibited varying adsorption capacities for the five acid dyes, with Acid Orange 12 (AO12) showing the highest at 2.66 mmol/g.
    • Langmuir analysis indicated maximum adsorption capacities ranging from 1.03 to 2.66 mmol/g.
    • Intraparticle diffusion was identified as the primary adsorption mechanism for all dyes.
    • Dye diffusion was influenced by pore size, involving macropores, mesopores, and micropores.

    Conclusions:

    • Chitosan is a promising adsorbent for removing acid dyes from aqueous solutions.
    • The adsorption process is governed by intraparticle diffusion and pore structure.
    • Understanding these mechanisms can optimize dye removal strategies for industrial wastewater treatment.