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A Study on the Adsorption of Rare Earth Elements by Raq and Crosslinked Chiosan.
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2004, v.17 no.2, pp.108-116
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(2004). A Study on the Adsorption of Rare Earth Elements by Raq and Crosslinked Chiosan.. Analytical Science and Technology, 17(2), 108-116.
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Abstract
The adsorption characteristics of raw and crosslinked chitosan for rare earth elements (REEs) have been studied. The range of optimum pH for the maximum adsorption was observed: pH 4.5∼5.5 for Nd3+, Tm3+ on raw and crosslinked chitosan; pH 4.0∼5.5 for La3+ and Ce3+ on crosslinked chitosan and pH 2.0 for those on raw chitosan. The adsorption rate of REE at pH 4.0 has been found in the order of Er3+>Gd3+>Yb3+>Nd3+>Lu3+>Eu3+>Tm3+>Ho3+>Dy3+>La3+>Ce3+>Y3+>Pr3+ in single metal system and that of Lu3+>Yb3+>Tm3+>Dy3+>Ho3+>Er3+>Eu3+>Gd3+>Nd3+>Y3+>La3+=Ce3+=Pr3+ in multi metal system. In the competitive adsorption of multi metal system, the amount of metal adsorption generally increased with increasing atomic number and with decreasing ionic radius. On the adsorption studies of metal ions on chitosan, the time of equilibrium adsorption which was reached at the maximum adsorption was about 5 hours. 83～95 % for Nd3+ ion and 90～106 % for Tm3+ ion, were recovered from the crosslinked chitosan.
- keywords
- Adsorption, Raw chitosan, Crosslinked chitosan, Rare earth elements
Reference
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