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Chitosan and chemically modified chitosan beads for acid dyes sorption
Kamari Azlan1, Wan Ngah Wan Saime, Liew Lai Ken
1Department of Chemistry, Faculty of Science and Technology, Universiti Pendidikan Sultan Idris, 35900 Perak, Malaysia. azlkam@yahoo.co.uk
Journal of Environmental Sciences (China)
|July 29, 2009
Summary
Chitosan beads effectively remove acid dyes like Acid Red 37 and Acid Blue 25 from water. While cross-linking reduces capacity, both chitosan and chitosan-EGDE offer promising, reusable, low-cost wastewater treatment solutions.
Area of Science:
- Environmental Chemistry
- Materials Science
- Water Treatment
Background:
- Acid dyes are common industrial pollutants.
- Effective and economical dye removal methods are needed for wastewater treatment.
- Chitosan is a biodegradable polymer with potential adsorbent properties.
Purpose of the Study:
- To evaluate chitosan and chitosan-ethylene glycol diglycidyl ether (EGDE) beads for removing Acid Red 37 (AR 37) and Acid Blue 25 (AB 25).
- To investigate the impact of EGDE cross-linking on adsorption capacity.
- To determine the optimal adsorption conditions and mechanism.
Main Methods:
- Adsorption experiments were conducted varying pH, agitation time, and dye concentration.
- Adsorption data were fitted to Langmuir, Freundlich, and BET isotherm models.
- Kinetic studies followed pseudo-second-order models.
- Desorption and FT-IR analyses were performed.
Main Results:
- Unmodified chitosan exhibited higher adsorption capacity for AR 37 and AB 25 than chitosan-EGDE.
- EGDE cross-linking reduced adsorption sites (-NH3+).
- Langmuir isotherm and pseudo-second-order kinetics best described the adsorption process.
- Adsorbents maintained effectiveness over three adsorption-desorption cycles.
Conclusions:
- Chitosan and chitosan-EGDE beads are effective and reusable adsorbents for acid dyes.
- Physical adsorption is the primary mechanism.
- These materials present a low-cost alternative for acid dye removal in wastewater treatment.
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