Plasma and Fusion Research
Volume 7, 2405021 (2012)
Regular Articles
- Graduate School of Engineering and Resource Science, Akita University, 1-1 Tegata-gakuen-cho, Akita 010-8502, Japan
- 1)
- National Institute of Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
Abstract
The deuterium-tritium (D-T) fusion reactor system is expected to provide the main source of electricity in the future. Large amounts of lithium will be required, dependent on the reactor design concept, and alternative resources should be found to provide lithium inventories for nuclear fusion plants. Seawater has recently become an attractive source of this element and the separation and recovery of lithium from seawater by co-precipitation, solvent extraction and adsorption have been investigated. Amongst these techniques, the adsorption method is suitable for recovery of lithium from seawater, because certain inorganic ion-exchange materials, especially spinel-type manganese oxides, show extremely high selectivity for the lithium ion. In this study, we prepared a lithium adsorbent (HMn2O4) by elution of spinel-type lithium di-manganese-tetra-oxide (LiMn2O4) and examined the kinetics of the adsorbent for lithium ions in seawater using a pseudo-second-order kinetic model. The intermediate, LiMn2O4, can be synthesized from LiOH·H2O and Mn3O4, from which the lithium adsorbent can subsequently be prepared via acid treatment., The adsorption kinetics become faster and the amount of lithium adsorbed on the adsorbent increases with increasing solution temperature. The thermodynamic values, ΔG0, ΔH0 and ΔS0, indicate that adsorption is an endothermic and spontaneous process.
Keywords
lithium recovery, seawater, adsorption, manganese dioxide, kinetics of lithium adsorption in seawater, pseudo-second-kinetic model
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References
- [1] J.N. Hartley et al., Energy 3, 337 (1978).
- [2] United States Geological Survey, Mineral Commodity Summaries, 2011, p.94.
- [3] T. Wajima et al., Proc. Renew. Energy 2006, p.1489.
- [4] E. Kunugita et al., Kagaku Kogaku Ronbunshu 16, 1045 (1990).
- [5] R. Chitrakar et al., Ind. Eng. Chem. Res. 40, 2054 (2001).
- [6] M. Abe et al., Water Treat. 5, 425 (1990).
- [7] W. Tang et al., J. Solid State Chem. 142, 142 (1991).
- [8] M. Abe et al., Hydrometallurgy 12, 83 (1984).
- [9] P.C. Ho et al., J. Chromatogr. 147, 263 (1978).
- [10] K. Ooi et al., J. Min. Met. Inst. Jpn. 99, 931 (1983).
- [11] G. Alberti, J. Inorg. Nucl. Chem. 32, 1719 (1970).
- [12] K. Ooi et al., Chem. Lett. 17, 989 (1988).
- [13] K. Ooi et al., Langmuir 5, 150 (1989).
- [14] K. Ooi et al., Langmuir 7, 1167 (1991).
- [15] K. Yoshizuka et al., Ars Separatoria Acta 1, 79 (2002).
- [16] A. Kitajou et al., Ars Separatoria Acta 2, 97 (2003).
- [17] K. Yoshizuka et al., Ars Separatoria Acta 4, 78 (2006).
- [18] H. Ohtaki, Ion no Suiwa (Kyoritu-syuppan, Tokyo, 1990) (in Japanese).
- [19] Y.S. Ho, Process Saf. Environ. Prot. 76B, 183 (1998).
- [20] Y.S. Ho, Process Biochem. 34, 451 (1999).
This paper may be cited as follows:
Takaaki WAJIMA, Kenzo MUNAKATA and Tatsuhiko UDA, Plasma Fusion Res. 7, 2405021 (2012).