Permeation behavior of rare earth metals with a calix[4]arene carboxyl derivative in a hollow-fiber membrane
| Autor: | Takahiko Kakoi, Tadashi Hano, Masahiro Goto, Fumiyuki Nakashio, Shintaro Furusaki, Fukiko Kubota |
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| Rok vydání: | 2000 |
| Předmět: |
Aqueous solution
Metal ions in aqueous solution Sodium Inorganic chemistry chemistry.chemical_element Filtration and Separation Microporous material Permeation Biochemistry chemistry.chemical_compound Membrane chemistry Hollow fiber membrane General Materials Science Physical and Theoretical Chemistry Derivative (chemistry) |
| Zdroj: | Journal of Membrane Science. 165:149-158 |
| ISSN: | 0376-7388 |
| DOI: | 10.1016/s0376-7388(99)00231-8 |
| Popis: | Extraction of three rare earth metals (Er, Ho and Y) was performed by a microporous hydrophobic hollow-fiber membrane extractor using a novel calix[4]arene carboxyl derivative in toluene. It was found that the permeation rate through the membrane of metal ions with calix[4]arene carboxyl derivative was relatively slow, while the addition of a small amount of sodium ion into the aqueous solution drastically accelerated the permeation rate and also enhanced the selectivity between heavy rare earth metals (Er and Ho) and Y. The experimental results obtained under a variety of conditions were analyzed by a diffusion model which combined with the complexation reaction at the aqueous-organic interface, taking account of the velocity distribution of the aqueous and organic solutions through the inner and outer sides, respectively, of the hollow-fiber membrane extractor. The model well explained the permeation behavior of the rare earth metals through the membrane and the role of sodium ion on the acceleration effect of the permeation rate. |
| Databáze: | OpenAIRE |
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