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Removal of dyes from aqueous solution using fly ash and red mud
Shaobin Wang1, Y Boyjoo, A Choueib
1Department of Chemical Engineering, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia. wangshao@vesta.curtin.edu.au
Water Research
|December 21, 2004
Summary
Fly ash and red mud effectively adsorb methylene blue dye from water. Acid treatment enhances fly ash adsorption, while heat treatment reduces capacity for both materials.
Area of Science:
- Environmental Science
- Materials Science
- Water Treatment
Background:
- Industrial byproducts like fly ash and red mud present disposal challenges.
- Developing cost-effective adsorbents for dye removal is crucial for water remediation.
Purpose of the Study:
- To evaluate fly ash and red mud as adsorbents for methylene blue removal.
- To investigate the impact of heat and nitric acid treatments on adsorption.
- To analyze adsorption data using isotherm models and determine thermodynamic parameters.
Main Methods:
- Batch adsorption experiments using fly ash and red mud.
- Application of heat and nitric acid treatments to adsorbents.
- Analysis of adsorption data using Langmuir, Freundlich, and Redlich-Peterson isotherms.
- Calculation of thermodynamic parameters (free energy, enthalpy, entropy).
Main Results:
- Fly ash exhibited higher methylene blue adsorption capacity than red mud.
- Nitric acid treatment increased fly ash adsorption capacity but decreased red mud capacity.
- The Redlich-Peterson model best described the adsorption data.
- Methylene blue adsorption onto both materials was an endothermic process.
Conclusions:
- Fly ash and red mud are viable adsorbents for methylene blue removal.
- Chemical modification with nitric acid can optimize adsorbent performance.
- Understanding adsorption thermodynamics is key for process design.