Journal
BIORESOURCE TECHNOLOGY
Volume 99, Issue 16, Pages 7573-7586Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2008.02.011
Keywords
adsorption; starch; ion-exchanger adsorbent; Acid Blue 25; batch experiments
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This article describes the use of a cationized starch-based material as new ion-exchanger adsorbent for the removal of C.I. Acid Blue 25 (AB 25) from aqueous solutions. Batch adsorption studies concerning the effects of contact time, pH and temperature are presented and discussed. Adsorption experimental data showed that: (i) the process was uniform and rapid: adsorption of dye reached equilibrium in 50 min in the wide pH range of dye solutions; (ii) adsorption kinetics followed the pseudo-second order model; (iii) the Langmuir model yielded a much better fit than the Freundlich model for the dye concentration range under study; (iv) this adsorbent exhibited interesting adsorption capacities: on the basis of the Langmuir analysis, the maximum adsorption capacity was determined to be 322 mg of dye per gram of material at 25 degrees C; (v) the adsorption capacity decreased with increasing temperature; and (vi) the negative value of free energy change indicated the spontaneous nature of adsorption. (C) 2008 Elsevier Ltd. All rights reserved.
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