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Related Experiment Videos

Intraparticle diffusion of a basic dye during adsorption onto sphagnum peat.

S J Allen1, G McKay, K Y Khader

  • 1Department of Chemical Engineering, David Keir Building, The Queen's University of Belfast, Belfast BT9 5AH, UK.

Environmental Pollution (Barking, Essex : 1987)
|January 1, 1989
PubMed
Summary

Peat effectively adsorbs basic dyes from water. Intraparticle diffusion, controlled by macropores and micropores, governs this adsorption process, with a proposed diffusion rate parameter.

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Area of Science:

  • Environmental Science
  • Water Treatment
  • Adsorption Technology

Background:

  • Basic dyes are common water pollutants.
  • Peat is an abundant, low-cost adsorbent material.
  • Understanding dye adsorption mechanisms is crucial for effective water remediation.

Purpose of the Study:

  • To investigate the adsorption of a basic dye onto peat.
  • To elucidate the mass transfer mechanism involved in the adsorption process.
  • To propose and correlate a diffusion rate parameter.

Main Methods:

  • Batch adsorption experiments were conducted.
  • Analysis of dye concentration in aqueous solutions.
  • Kinetic modeling to determine the rate-limiting step.

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Main Results:

  • Peat demonstrated significant capacity for basic dye adsorption.
  • Intraparticle diffusion was identified as the primary mass transfer mechanism.
  • The diffusion process was found to be influenced by both macropore and micropore diffusion.

Conclusions:

  • Peat is a viable adsorbent for basic dye removal from wastewater.
  • The proposed diffusion model accurately describes the adsorption kinetics.
  • A diffusion rate parameter (k) was established and correlated with system variables.