期刊
CHEMICAL ENGINEERING JOURNAL
卷 217, 期 -, 页码 486-494出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.10.076
关键词
Eu(III); Titanate nanotubes; Spectroscopic technique; Interaction mechanism; Microstructure
资金
- National Natural Science Foundation of China [21207092, 21177088, 21176156, 21001002, 20907055, 21071147, 20971126]
- Natural Science Foundation of Zhejiang Province [LY12B06003]
- Zhejiang Science and Technology Projects [2011C31034]
- 973 project [2011CB933700]
- Knowledge Innovation Program of CAS
- Special Foundation for High-level Waste Disposal [2007-840]
This work investigated the effects of reaction temperature on Eu(III) interaction mechanism and microstructure at the titanate nanotubes (TNTs)/water interface by batch and spectroscopic (FTIR, XPS, XAFS) technique. Batch adsorption results showed that the adsorption of Eu(III) onto TNTs is promoted at higher temperature, and is an endothermic and spontaneous interfacial process. The adsorption isotherms at three different temperatures can be described by the Freundlich model better than the Langmuir model did. The spectroscopic analysis results suggested that Eu(III) interaction with TNTs is mainly controlled by outer-sphere surface complexation at T = 293 K, which is a reversible adsorption process, whereas Eu(III) interaction is mainly controlled by inner-sphere surface complexation at T = 313 K and T = 343 K, which is an irreversible adsorption process. The findings in this work can help us to better understand the physicochemical behavior of Eu(III) and related radionuclides in natural environment. The results of this work also show the great potential importance of TNTs as novel nanomaterials in the near future of nuclear waste management. (C) 2012 Elsevier B.V. All rights reserved.
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