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Dye adsorption onto activated carbons from tyre rubber waste using surface coverage analysis.
Edward L K Mui1, W H Cheung, Marjorie Valix
1Department of Chemical & Biomolecular Engineering, Hong Kong University of Science & Technology, Clearwater Bay, Kowloon, Hong Kong SAR.
Journal of Colloid and Interface Science
|April 27, 2010
Summary
Activated carbons from tyre char effectively adsorb acid dyes, with sulfuric acid treatment enhancing capacity. These novel materials show promise for dye removal applications.
Area of Science:
- Materials Science
- Environmental Chemistry
- Adsorption Science
Background:
- Activated carbons are widely used for dye adsorption.
- Tyre char is an abundant waste material with potential for valorization.
- Sulphuric acid treatment can modify activated carbon properties.
Purpose of the Study:
- To produce and characterize activated carbons from tyre char.
- To evaluate their adsorption capacity for Acid Blue 25 and Acid Yellow 117.
- To correlate adsorption performance with material properties and propose adsorption models.
Main Methods:
- Activated carbons were produced from tyre char via CO2 activation.
- Materials were characterized using BET surface area, pore analysis, pH, and elemental analysis.
- Dye adsorption isotherms were modeled using the Redlich-Peterson equation.
Main Results:
- BET surface areas ranged from 59-1118 m²/g.
- Acid-treated carbons showed higher adsorption capacities for both dyes compared to untreated carbons.
- Some tyre-derived carbons outperformed commercial activated carbon (Calgon F400).
Conclusions:
- Activated carbons from tyre char are effective adsorbents for acid dyes.
- Sulphuric acid treatment enhances adsorption performance.
- Adsorption is influenced by surface area, charge, and mesopore accessibility.
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