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Related Experiment Videos

Adsorption of basic dye from aqueous solution onto fly ash.

J X Lin1, S L Zhan, M H Fang

  • 1College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, PR China; College of Materials and Chemical Engineering, Zhejiang University, Hangzhou 310027, PR China.

Journal of Environmental Management
|February 20, 2007
PubMed
Summary

Acid-treated fly ash effectively removes methylene blue dye from water. Freundlich isotherm and pseudo-second-order kinetics best describe this low-cost adsorption process, which is endothermic.

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Adsorption Science

Background:

  • Fly ash, a byproduct of coal combustion, presents disposal challenges.
  • Developing cost-effective adsorbents for dye removal is crucial for water remediation.
  • Methylene blue is a common model dye pollutant in industrial wastewater.

Purpose of the Study:

  • To investigate the efficacy of sulfuric acid-treated fly ash as a low-cost adsorbent for methylene blue removal.
  • To characterize the adsorption behavior using isotherm and kinetic models.
  • To determine the thermodynamic nature of the adsorption process.

Main Methods:

  • Fly ash was treated with sulfuric acid (H2SO4) to enhance its adsorption properties.
  • Batch adsorption experiments were conducted using methylene blue in aqueous solutions.

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  • Adsorption data were analyzed using Langmuir and Freundlich isotherm models.
  • Adsorption kinetics were evaluated using pseudo-first-order and pseudo-second-order models.
  • Thermodynamic parameters, including enthalpy change, were calculated.

    • Main Results:

    • Acid treatment significantly increased the specific surface area and methylene blue adsorption capacity of fly ash.
    • The Freundlich isotherm model provided a better fit to the experimental data than the Langmuir model.
    • The pseudo-second-order kinetic model accurately described the adsorption rate.
    • The positive enthalpy change (5.63 kJ/mol) indicated an endothermic adsorption process.

    Conclusions:

    • Sulfuric acid-treated fly ash is a promising, low-cost adsorbent for methylene blue removal from wastewater.
    • The adsorption mechanism is best described by the Freundlich isotherm and pseudo-second-order kinetics.
    • The endothermic nature of the adsorption suggests that temperature may influence removal efficiency.