Chitosan and chemically modified chitosan beads for acid dyes sorption |
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Authors: | AZLAN Kamari WAN SAIME Wan Ngah and LAI KEN Liew |
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Institution: | 1. Department of Chemistry, Faculty of Science and Technology, Universiti Pendidikan Sultan Idris, 35900 Perak, Malaysia 2. School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia |
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Abstract: | The capabilities of chitosan and chitosan-EGDE (ethylene glycol diglycidyl ether) beads for removing Acid Red 37 (AR 37) and Acid Blue 25 (AB 25) from aqueous solution were examined. Chitosan beads were cross-linked with EGDE to enhance its chemical resistance and mechanical strength. Experiments were performed as a function of pH, agitation period and concentration of AR 37 and AB 25. It was shown that the adsorption capacities of chitosan were comparatively higher than chitosan-EGDE for both acid dyes. This is mainly because cross-linking using EGDE reduces the major adsorption sites -NH3+ on chitosan. Langmuir isotherm model showed best conformity compared to Freundlich and BET. The kinetic experimental data agreed very well to the pseudo second-order kinetic model. The desorption study revealed that after three cycles of adsorption and desorption by NaOH and HCl, both adsorbents retained their promising adsorption abilities. FT-IR analysis proved that the adsorption of acid dyes onto chitosan-based adsorbents was a physical adsorption. Results also showed that chitosan and chitosan-EGDE beads were favourable adsorbers and could be employed as low-cost alternatives for the removal of acid dyes in wastewater treatment. |
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Keywords: | cross-linking acid dyes adsorption capacities adsorption rates adsorption isotherm desorption |
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