%0 Journal Article %T Se(VI) sorption from aqueous solution using alginate/polyethylenimine membranes: Sorption performance and mechanism %+ Polymères Composites et Hybrides (PCH - IMT Mines Alès) %+ Institut Européen des membranes (IEM) %A Mo, Yayuan %A Vincent, Thierry %A Faur, Catherine %A Guibal, Eric %< avec comité de lecture %@ 0141-8130 %J International Journal of Biological Macromolecules %I Elsevier %V 147 %P 832-843 %8 2020 %D 2020 %R 10.1016/j.ijbiomac.2019.10.055 %K Alginate-polyethylenimine composite membrane %K Selenium sorption %K Binding mechanism %K Recycling %K Isotherms %K Kinetics %Z Chemical Sciences/Polymers %Z Chemical Sciences/Chemical engineeringJournal articles %X New high percolating alginate membranes are designed without using sophisticated drying methods: negatively charged alginate reacts with positively charged polyethylenimine (PEI), prior to be crosslinked with glutaraldehyde and air-dried. This is sufficient to obtain a highly macroporous structured membrane. Highly percolating properties of these new A-PEI membranes make the material applicable in natural drainage systems. The high density of amine groups in composite membranes explain their high affinity for anions in acidic solutions. FTIR, SEM-EDX and XPS analysis are used to explore the sorption mechanism. Se(VI) is sorbed through electrostatic attraction between positive amine groups and negative selenium anions; in a second step, bound Se(VI) is reduced by amine and hydroxyl groups in acidic conditions. A-PEI membranes are successfully used for recovering Se(VI) anions at pH 2. The maximum sorption capacity is close to 83 mg Se g−1; the sorption isotherm is described by the Sips and Langmuir equations. The membranes are poorly sensitive to flow rate in the range 15–50 mL min−1. The kinetic profiles are fitted by the pseudo-first order rate equation. Solute desorption is operated using NaOH solutions; the sorbent shows a remarkable stability in sorption and desorption properties for a minimum of 4 cycles. %G English %2 https://imt-mines-ales.hal.science/hal-02456526/document %2 https://imt-mines-ales.hal.science/hal-02456526/file/se-vi-sorption-from-aqueous-solution.pdf %L hal-02456526 %U https://imt-mines-ales.hal.science/hal-02456526 %~ INSTITUT-TELECOM %~ CNRS %~ EM-ALES %~ ENSC-MONTPELLIER %~ IEM %~ INC-CNRS %~ CHIMIE %~ UNIV-MONTPELLIER %~ INSTITUTS-TELECOM %~ TEST-HALCNRS %~ UM-2015-2021 %~ TEST2-HALCNRS %~ TEST3-HALCNRS