Modification of the Selectivity Properties of Tubular Ceramic Membranes after Alkaline Treatment
| Autor: | Sébastien Déon, Lionel Limousy, Jérôme Anquetil, Patrick Dutournié |
|---|---|
| Přispěvatelé: | Laboratoire d'Ingénierie des Matériaux de Bretagne (LIMATB), Université de Bretagne Sud (UBS)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Université de Brest (UBO)-Université de Brest (UBO), TAMI Industries, Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Sodium
Inorganic chemistry chemistry.chemical_element Filtration and Separation 02 engineering and technology Dielectric lcsh:Chemical technology 010402 general chemistry TiO2 membrane pure salt-water filtration polarisability rejection sequence dielectric effects 01 natural sciences Article law.invention chemistry.chemical_compound law [CHIM]Chemical Sciences Chemical Engineering (miscellaneous) lcsh:TP1-1185 Ceramic lcsh:Chemical engineering Filtration TiO 2 membrane Process Chemistry and Technology lcsh:TP155-156 021001 nanoscience & nanotechnology 6. Clean water 0104 chemical sciences Solvent Membrane chemistry visual_art visual_art.visual_art_medium 0210 nano-technology Selectivity Fluoride |
| Zdroj: | Membranes Membranes; Volume 7; Issue 4; Pages: 65 Membranes, Vol 7, Iss 4, p 65 (2017) Membranes, MDPI, 2017, 7 (4), pp.65. ⟨10.3390/membranes7040065⟩ |
| ISSN: | 2077-0375 |
| DOI: | 10.3390/membranes7040065⟩ |
| Popis: | International audience; This work focuses on the selectivity modification of ceramic membranes after a mild alkaline treatment. Filtration of pure saltwater solutions was carried out with commercial titania membranes before and after the treatment. After treatment, the rejection of NaF significantly decreased, while the rejection of NaCl and NaBr increased. Additionally, NaI and Na 2 SO 4 remained close to zero. Pore size and electrical charge being almost unchanged, only significant modifications in the dielectric effects can explain this modification of selectivity. Therefore, the surface chemistry and the interaction (nature and magnitude) with the solvent and with the species present in the solution appear to be modified by the alkaline treatment. This trend is also illustrated by discussing the electric and the dielectric properties that were numerically identified before and after treatment. The alkaline treatment significantly decreased the apparent dielectric constant of NaCl-water solution in the pore, highlighting the rejection of sodium chloride. Contrariwise, the modification of the surface chemistry increased the apparent dielectric constant of NaF-water solution by promoting fluoride transmission. |
| Databáze: | OpenAIRE |
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