In this study, C.I. Reactive Red 2 (RR2) was removed from aqueous solutions by chitin. Exactly how the RR2 concentration, chitin dosage, pH, and temperature affected adsorption of RR2 by chitin was then determined. After reaction for 120 min, the amount of 10 and 20 mg/L RR2 absorbed onto chitin was 5.7 and 7.5 mg/g, respectively. The adsorption percentage increased from 56 to 94% when the chitin dosage was increased from 1.5 to 2.5 g/L. Experimental results indicated that the pseudo-second-order model best represents adsorption kinetics. Adsorption of RR2 increased as the temperature increased; however, it decreased with an increased pH. Experimental results further demonstrated that the Freundlich model is superior to the Langmuir model in fitting experimental isotherms. The ΔH0 and ΔS0 were 16.34 kJ/mol and 152.10 J/mol K, respectively. ΔH0 suggested that adsorption of RR2 onto chitin was via physisorption.
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Research Article|
February 01 2012
Removal of C.I. Reactive Red 2 from aqueous solutions by chitin: an insight into kinetics, equilibrium, and thermodynamics
C. H. Wu;
1Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung 807, Taiwan
E-mail: wuch@kuas.edu.tw
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C. Y. Kuo;
C. Y. Kuo
2Department of Environmental and Safety Engineering, National Yunlin University of Science and Technology, Taiwan
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C. H. Yeh;
C. H. Yeh
3Department of Environmental Engineering, Da-Yeh University, Taiwan
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M. J. Chen
M. J. Chen
3Department of Environmental Engineering, Da-Yeh University, Taiwan
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Water Sci Technol (2012) 65 (3): 490–495.
Article history
Received:
July 18 2011
Accepted:
September 21 2011
Citation
C. H. Wu, C. Y. Kuo, C. H. Yeh, M. J. Chen; Removal of C.I. Reactive Red 2 from aqueous solutions by chitin: an insight into kinetics, equilibrium, and thermodynamics. Water Sci Technol 1 February 2012; 65 (3): 490–495. doi: https://doi.org/10.2166/wst.2012.878
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