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Received July 7, 2010
Accepted November 19, 2010
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Adsorption behavior of L-tryptophan on ion exchange resin
Institute of Bioengineering, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China 1Zhejiang University City College, Hangzhou 310015, China
lhuangblue@zju.edu.cn
Korean Journal of Chemical Engineering, May 2011, 28(5), 1272-1279(8), 10.1007/s11814-010-0490-2
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Abstract
A batch method was applied to investigate the adsorption behavior and mechanisms of L-tryptophan (Ltrp) on ion exchange resins. HZ-001 and JK006 were proved to be ideal adsorbents due to their large loading capacity and favorable selective adsorption for L-trp. Langmuir, Freundlich, and Dubinin-Radushkevich equations were applied to simulate the experimental data to describe the adsorption process of L-trp onto HZ-001 and JK006. The maximum loading capacity (at pH 5.0, 30℃ ), determined by the Langmuir and Dubinin-Radushkevich models, was close to each other (833 mg/g vs. 874 mg/g) for HZ-001, while discrepant (833 mg/g vs. 935 mg/g) for JK006. Three diffusion-controlled kinetic models were utilized to analyze the results in order to identify the adsorption mechanism. The adsorption kinetics of L-trp onto cation exchange resins was investigated under different experimental conditions, including initial solution pH, temperature, initial L-trp concentration, and adsorbent dosage. Moreover, the diffusion process of L-trp onto HZ-001 and JK006 was evaluated at different initial adsorbate concentrations. The thermodynamic parameters, obtained from the kinetic data, demonstrated that L-trp could be adsorbed spontaneously onto both resins.
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