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<dc:title xml:lang="fr">Adsorption de "métaux lourds" par des silices mésoporeuses fonctionnalisées par des ligands bioinspirés : de l'élaboration du matériau à son application à la dépollution de l'eau</dc:title>
<dcterms:alternative xml:lang="en">Adsorption of « heavy metals » on mesoporous silica functionalised by bioinspired ligands : from the elaboration of the material to its application in water depollution</dcterms:alternative>
<dc:subject xml:lang="fr">Adsoption</dc:subject>
<dc:subject xml:lang="fr">Traitement de l'eau</dc:subject>
<dc:subject xml:lang="fr">Silice mésoporeuse</dc:subject>
<dc:subject xml:lang="fr">Glutathion</dc:subject>
<dc:subject xml:lang="fr">Phytochélatines</dc:subject>
<dc:subject xml:lang="fr">"Métaux lourds"</dc:subject>
<dc:subject xml:lang="fr">Biopolymères</dc:subject>
<dc:subject xml:lang="fr">Alginates</dc:subject>
<dc:subject xml:lang="fr">ITC</dc:subject>
<dc:subject xml:lang="en">Adsoption</dc:subject>
<dc:subject xml:lang="en">Water treatment</dc:subject>
<dc:subject xml:lang="en">Mesoporous silica</dc:subject>
<dc:subject xml:lang="en">Glutathione</dc:subject>
<dc:subject xml:lang="en">Phytochelatins</dc:subject>
<dc:subject xml:lang="en">"Heavy metals"</dc:subject>
<dc:subject xml:lang="en">Biopolymers</dc:subject>
<dc:subject xml:lang="en">Alginate</dc:subject>
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<tef:elementdEntree autoriteExterne="027232476" autoriteSource="Sudoc">Eau -- Épuration</tef:elementdEntree>
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<tef:vedetteRameauNomCommun>
<tef:elementdEntree autoriteExterne="220911169" autoriteSource="Sudoc">Titrage calorimétrique isotherme</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le développement à grande échelle de l’industrie a entraîné l’augmentation de l’utilisation de métaux et composés d’ions métalliques qui se retrouvent dans l’eau, sous forme de micropolluants que les technologies actuelles n’éliminent pas complétement. Dans ce travail, un matériau bioinspiré basé sur une silice mésoporeuse fonctionnalisée avec des ligands soufrés d’origine naturelle ou synthétique a été développé pour l’élimination d’ions métalliques par adsorption. Le matériau SBA-15 + glutathion (commercial) présente des capacités d’adsorption de Cd(II), Cu(II), Pb(II) et Zn(II), une sélectivité accrue par rapport aux procédés existants et une efficacité même en présence de micropolluants. Les capacités d’adsorption et la sélectivité du matériau sont conservées lorsque celui-ci est synthétisé à partir de ligands bioproduits par culture cellulaire végétale in vitro. En vue de son application dans l’industrie, ce matériau a été mis en forme dans des billes et utilisé en continu dans une colonne dans laquelle il est possible de réutiliser le matériau sur plusieurs cycles adsorption/désorption successifs, sans altération de ses propriétés.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The large-scale development of the industry led to an increase in the use of metals and metal ionic compounds, which later end up in water as micropollutants. However, these micropollutants are not completely eliminated by current wastewater treatment technologies. In this work, a bioinspired material based on mesoporous silica functionalised with sulphur ligands of natural or synthetic origin was developed to eliminate metal ions by adsorption. The SBA-15 + glutathione (commercial) material showed adsorption capacities for Cd(II), Cu(II), Pb(II) and Zn(II), an increased selectivity compared to existing processes and stayed efficient even in the presence of micropollutants. Adsorption thermodynamics and competition effects were studied by isothermal titration calorimetry (ITC). The adsorption capacities and selectivity were preserved when the ligands were bioproduced via in vitro cell culture. For industrialisation purposes, this material was shaped into beads and used for continuous adsorption in a column in which it is possible to reuse the material over several successive adsorption/desorption cycles, without any impairment of its properties.</dcterms:abstract>
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