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Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper
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Statistical optimization, interaction analysis and desorption studies for the azo dyes adsorption onto chitosan films
T V Rêgo1, T R S Cadaval, G L Dotto
1Unit Operation Laboratory, School of Chemistry and Food, Federal University of Rio Grande-FURG, 475 Engenheiro Alfredo Huch Street, 96203-900 Rio Grande, RS, Brazil.
Journal of Colloid and Interface Science
|October 12, 2013
Summary
Chitosan films effectively remove azo dyes like tartrazine and amaranth from water via adsorption. Optimized conditions yielded high adsorption capacities, with reusable films for multiple cycles.
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Azo dyes are common pollutants in wastewater.
- Chitosan is a biodegradable polymer with potential for dye removal.
Purpose of the Study:
- To investigate chitosan films (CF) for azo dye removal.
- To optimize adsorption conditions using response surface methodology.
- To characterize dye-adsorbent interactions.
Main Methods:
- Chitosan films prepared by casting.
- Adsorption optimized for pH and CF concentration.
- Characterization using FTIR, EDX, TGA, and colorimetry.
- Adsorption-desorption cycles performed.
Main Results:
- Optimal adsorption at pH 2 and 100 mg L(-1) CF concentration.
- High adsorption capacities: 413.8 mg g(-1) for tartrazine, 278.3 mg g(-1) for amaranth.
- Protonated chitosan amino groups interact with anionic dyes.
- Chitosan films maintained adsorption capacity for two cycles.
Conclusions:
- Chitosan films are effective adsorbents for azo dyes.
- Optimized conditions enhance dye removal efficiency.
- CF demonstrate reusability for sustainable wastewater treatment.
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