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Title: Biosorption of lanthanum, cerium, europium, and ytterbium by a brown marine alga, turbinaria conoides
Authors: Vijayaraghavan, K. 
Sathishkumar, M. 
Balasubramanian, R. 
Issue Date: 5-May-2010
Citation: Vijayaraghavan, K., Sathishkumar, M., Balasubramanian, R. (2010-05-05). Biosorption of lanthanum, cerium, europium, and ytterbium by a brown marine alga, turbinaria conoides. Industrial and Engineering Chemistry Research 49 (9) : 4405-4411. ScholarBank@NUS Repository.
Abstract: The ability of a brown marine alga, Turbinaria conoides, to remove four rare-earth elements (REEs; lanthanum, cerium, europium, and ytterbium) was evaluated. Results showed that T. conoides was an excellent biosorbent for all four REEs. The equilibrium pH was found to severely affect the biosorption performance; pH 4.9 ± 0.2 was found to be an optimum pH for favorable biosorption of REEs. The biosorption mechanism was found to proceed mainly by ion-exchange reactions between the lanthanide ions and the carboxyl groups present on the algal surface, confirmed by the pH edge, desorption, and scanning electron microscopy/energy-dispersive X-ray results. Biosorption isotherms were modeled using the Langmuir, Freundlich, and Toth isotherms, with the latter-described REE isotherms with very high correlation coefficients and lower error values. Maximum biosorption uptakes, according to the Langmuir model, were recorded as 154.7, 152.8, 138.2, and 121.2 mg/g for La, Ce, Eu, and Yb, respectively. Biosorption kinetics of REEs was found to be rapid, achieving 90% of total biosorption within 50 min. Desorption was successful with 0.05 M HCl, and the biomass was regenerated and reused for three sorption-desorption cycles without a significant loss in the biosorption capacity. © 2010 American Chemical Society.
Source Title: Industrial and Engineering Chemistry Research
ISSN: 08885885
DOI: 10.1021/ie1000373
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