Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Kinetics and thermodynamics of indanthrene textile dye adsorption onto chitosan

Kinetics and thermodynamics of indanthrene textile dye adsorption onto chitosan AbstractThe kinetics and equilibrium of Indanthrene Olive Green (IOG) adsorption on chitosan, from aqueous solutions, have been investigated. The chitosan was characterized by XRD, average degree of deacetylation (DD), TGA/DTG, IR, SEM and specific BET surface area. Batch adsorptions experiments were carried out in different pH and dye concentration. An acidic pH condition (4.0 to 6.0) was favorable to the adsorption process. The adsorption followed secondorder rate kinetics and the experimental equilibrium data followed Langmuir isotherm, suggesting that chemisorption might be the major adsorption mode. The adsorptions also occurred on chitosan fibers, being significantly lower than that of crushed chitosan. Thermodynamic parameters ( ΔG°, ΔH°, and S°) were calculated. The positive values of ΔH° (161.7 kJ mol-1) and S° (559.9 J mol-1 K-1) suggest that the adsorption is endothermic and that during this adsorption process the randomness of the system increases. A simplified adsorption model is also proposed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png e-Polymers de Gruyter

Kinetics and thermodynamics of indanthrene textile dye adsorption onto chitosan

Download PDF
16 pages

Loading next page...
 
/lp/de-gruyter/kinetics-and-thermodynamics-of-indanthrene-textile-dye-adsorption-onto-hoC9bi0Qt6

References (2)

Publisher
de Gruyter
Copyright
© 2013 by Walter de Gruyter GmbH & Co.
ISSN
2197-4586
eISSN
1618-7229
DOI
10.1515/epoly.2010.10.1.716
Publisher site
See Article on Publisher Site

Abstract

AbstractThe kinetics and equilibrium of Indanthrene Olive Green (IOG) adsorption on chitosan, from aqueous solutions, have been investigated. The chitosan was characterized by XRD, average degree of deacetylation (DD), TGA/DTG, IR, SEM and specific BET surface area. Batch adsorptions experiments were carried out in different pH and dye concentration. An acidic pH condition (4.0 to 6.0) was favorable to the adsorption process. The adsorption followed secondorder rate kinetics and the experimental equilibrium data followed Langmuir isotherm, suggesting that chemisorption might be the major adsorption mode. The adsorptions also occurred on chitosan fibers, being significantly lower than that of crushed chitosan. Thermodynamic parameters ( ΔG°, ΔH°, and S°) were calculated. The positive values of ΔH° (161.7 kJ mol-1) and S° (559.9 J mol-1 K-1) suggest that the adsorption is endothermic and that during this adsorption process the randomness of the system increases. A simplified adsorption model is also proposed.

Journal

e-Polymers – de Gruyter

Published: Dec 1, 2010

There are no references for this article.