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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received February 2, 2006
Accepted March 28, 2006

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Adsorption and desorption of phenylalanine and tryptophane on a nonionic polymeric sorbent

Jae-Wook Lee Thi Phuong Binh Nguyen¹ Hee Moon^1†

Department of Environmental and Chemical Engineering, Seonam University, Namwon 590-711, Korea ¹Centre for Functional Nano Chemicals and Department of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Korea

hmoon@chonnam.ac.kr

Korean Journal of Chemical Engineering, September 2006, 23(5), 812-818(7), 10.1007/BF02705933

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Abstract

Adsorption equilibrium of two amino acids - Phenylalanine (Phe) and Tryptophane (Trp) - onto nonionic polymeric sorbent, SP850 was studied under various pH values and temperatures. Adsorption equilibrium data of two amino acids on SP850 were fitted well with the Langmuir and Freundlich equations. Thermodynamic parameters such as Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) were evaluated by applying the Van’t Hoff equation. Besides, adsorption kinetic of Phe was also investigated. Adsorption kinetic data were analyzed using the models of pseudofirst- order, pseudo-second-order and intraparticle diffusion. The results indicated that the pseudo-second-order model was more successful in simulating the adsorption kinetic data and the adsorption rate was mainly controlled by the diffusion rate in adsorption process. On the other hand, desorption studies were conducted by employing different organic solvents such as isopropyl alcohol (IPA), ethanol, and methanol. It was found that IPA was the best material for desorbing amino acid on the polymeric sorbent.

Keywords

Adsorption Desorption Amino Acids Nonionic Polymeric Sorbent

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