Gamma alumina nanofiltration membrane

Alami-Younssi, S.; Larbot, A.; Persin, M.; Sarrazin, J.; Cot, L.

doi:10.1016/0376-7388(94)00022-0

Cited by 41 publications

(13 citation statements)

References 12 publications

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“…[1][2][3] Moreover, to increase ionic separation, nanofiltration can be combined with a selective complexation step: retention of the target element is improved because the complex with the ligand, of larger size and mass than the target ion, prevents this ion from passing through the membrane. 4 For such a purpose, water-soluble ligands with molecular weight of about 500 g/mol can be used in the case of the nanofiltrationcomplexation association, whereas micro-or ultrafiltrationcomplexation systems need larger ligands and induce some specific problems of increasing viscosity and precipitation. 5 Our laboratory has been developping the nanofiltrationcomplexation technique since 1993.…”

Section: Introductionmentioning

confidence: 99%

New Cesium-Selective Hydrophilic Ligands: UV Measures of Their Interactions toward Cs and Cs/Na Separation by Nanofiltration Complexation

et al. 2000

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Separating traces of cesium from aqueous medium containing large sodium amounts is a difficult problem because cesium and sodium ions have a similar behavior in aqueous medium. We selected a highly cesiumselective ligand in aqueous medium, and we determined the best conditions for using this ligand in a nanofiltration-complexation process in order to achieve Cs + /Na + separation. We also tried to find a relation between the ligand structure and its activity toward cesium complexation. Tetrahydroxylated bis-crown-6 calix[4]arene was found to be very cesium selective (S ) (Cs + )/ (Na + ) ) 6600). Combined with a nanofiltration process, this ligand helped reaching 90% cesium retention in a highly concentrated aqueous medium ([NaNO 3 ] ) 3 mol/L). IntroductionAmong the different available separative methods (liquidliquid and solid-liquid extractions, ion-exchange resins), nanofiltration (NF) is a new pressure-driven membrane process which produces very few additional wastes. Located between ultrafiltration and reverse osmosis, nanofiltration membranes " cutoffs " are in the range of 300-1000 g/mol molecular weight. 1-3 Moreover, to increase ionic separation, nanofiltration can be combined with a selective complexation step: retention of the target element is improved because the complex with the ligand, of larger size and mass than the target ion, prevents this ion from passing through the membrane. 4 For such a purpose, water-soluble ligands with molecular weight of about 500 g/mol can be used in the case of the nanofiltrationcomplexation association, whereas micro-or ultrafiltrationcomplexation systems need larger ligands and induce some specific problems of increasing viscosity and precipitation. 5 Our laboratory has been developping the nanofiltrationcomplexation technique since 1993. [6][7][8][9] We showed that using EDTA with a Desal 5 DK or a Nanomax 50 membrane allowed a 100% retention (rejection) of Sr 2+ and other polyvalent ions, and only a 10% retention of Na + and Cs + ions. Then, with the use of a cesium-selective ligand such as resorcinarene, Cs + / Na + separation was also improved but not satisfactorily. In fact, to remove radioactive traces of cesium in highly salted aqueous medium, a minimum of 99% Cs + retention with a maximum of 10% Na + retention is required for industrial applications.So the aim of the present study was to select a highly cesiumselective ligand in aqueous medium, and then to determine the

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Section: Introductionmentioning

confidence: 99%

New Cesium-Selective Hydrophilic Ligands: UV Measures of Their Interactions toward Cs and Cs/Na Separation by Nanofiltration Complexation

et al. 2000

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“…Poor salt rejection in Mg 2+ -salt solutions could be explained on the basis of the charge exclusion mechanism induced by charge reversal because of the selective adsorption of Mg 2+ . Alami-Younssi et al [373] reported metal-complex desalination using a γ-alumina membrane with a 7 Å pore diameter, in which fluxes and salt rejections were found to be the functions of pH of solution as well as size charge of the complexes. Fluxes were influenced by the electrostatic interactions between complex and membrane surface, whereas the rejections depend on size and charge of the complex.…”

Section: Inorganic Membranes For Pervaporative Desalinationmentioning

confidence: 99%

Structures, Properties, and Performances—Relationships of Polymeric Membranes for Pervaporative Desalination

et al. 2019

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For the fulfilment of increasing global demand and associated challenges related to the supply of clean-and-safe water, PV has been considered as one of the most attractive and promising areas in desalinating salty-water of varied salinities. In pervaporative desalination, the sustainability, endurance, and structural features of membrane, along with operating parameters, play the dominant roles and impart paramount impact in governing the overall PV efficiency. Indeed, polymeric- and organic-membranes suffer from several drawbacks, including inferior structural stability and durability, whereas the fabrication of purely inorganic membranes is complicated and costly. Therefore, recent development on the high-performance and cost-friendly PV membrane is mostly concentrated on synthesizing composite- and NCP-membranes possessing the advantages of both organic- and inorganic-membranes. This review reflects the insights into the physicochemical properties and fabrication approaches of different classes of PV membranes, especially composite- and NCP-membranes. The mass transport mechanisms interrelated to the specialized structural features have been discussed. Additionally, the performance potential and application prospects of these membranes in a wide spectrum of desalination and wastewater treatment have been elaborated. Finally, the challenges and future perspectives have been identified in developing and scaling up different high-performance membranes suitable for broader commercial applications.

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“…In the synthesis, generally, solvents were dried by storing them over molecular sieves (Aldrich; 4 Å , [8][9][10][11][12]. The materials and reagents were purchased from Fluka or Merck, were used without further purification, and were standard analytical grade.…”

Section: Ligandmentioning

confidence: 99%

“…2), where the retention of the target ion is improved because the complex with the ligand (possess larger size and mass than the target ion) prevents this ion from passing through the membrane [12]. For such a purpose, water soluble ligands can be used in the case of NF-complexation association.…”

Section: Introductionmentioning

confidence: 98%

Removal of Chromium Anions with Nanofiltration-Complexation by Using p-Sulfonated Calix[4]arene

Tabakcı

Erdemir

2008

Supramolecular Chemistry

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This article describes the removal of chromium anions from aqueous solutions by using nanofiltrationcomplexation consisting of pilot-scale nanofiltration equipment (Osmonics Sepa CF Membrane Cell) and water-soluble p-sulfonated calix[4]arene ligand. For the determination of optimum removal conditions of the chromium anions, the effect of pH, ligand cavity size, and foreign anions on the retention of the chromium anions in nanofiltration-complexation system was also evaluated. The results showed that water-soluble p-sulfonated calix[4]arene was an effective and selective ligand for the chromium anions over Cl 2 , SO 4 22 and NO 3 2 anions in nanofiltration-complexation system at pH 9.4.

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Gamma alumina nanofiltration membrane

Cited by 41 publications

References 12 publications

New Cesium-Selective Hydrophilic Ligands: UV Measures of Their Interactions toward Cs and Cs/Na Separation by Nanofiltration Complexation

New Cesium-Selective Hydrophilic Ligands: UV Measures of Their Interactions toward Cs and Cs/Na Separation by Nanofiltration Complexation

Structures, Properties, and Performances—Relationships of Polymeric Membranes for Pervaporative Desalination

Removal of Chromium Anions with Nanofiltration-Complexation by Using p-Sulfonated Calix[4]arene

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