کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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636764 | 1456131 | 2010 | 6 صفحه PDF | دانلود رایگان |
First separation of Ln(III) using an inorganic nanofiltration membrane has been achieved. Ln(III) ions are strongly repelled by the ZrO2/TiO2 membrane. When diethylenetriaminepentaacetic acid (DTPA) is used as water soluble complexing agent, the complexes formed with Ln(III), surprisingly passes through the membrane. The stability constant of DTPA with Eu3+ is higher than the one with La3+. Thus [EuDTPA]2− complex is formed at lower pH than [LaDTPA]2− and so these two elements can be separated. With an equimolar mixture of Eu3+ and La3+, a La3+/Eu3+ separation factor of 2.5 is obtained at pH 1.9. Other polyaminocarboxylic acids have been used such as EDTA and HEDTA and similar phenomenon occur. The best La3+/Eu3+ separation factor has been obtained with HEDTA. In that case, the La3+/Eu3+ separation factor is 7.5 at pH 2.3. All these ligands have been also evaluated with a TiO2 nanofiltration membrane and results are comparable.
Journal: Journal of Membrane Science - Volume 348, Issues 1–2, 15 February 2010, Pages 41–46