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Modification de membranes par des films polymères : Application à la décontamination de solutions aqueuses contenant des ions métalliques

Abstract : The aim of this work is to study the efficiency of a decontamination method allowing theremoval of metallic ions (Ni2+, Cu2+ and Zn2+) by using chemically modified organic ultrafiltrationmembranes.The first functionalization method used to modify membranes is called layer-by-layer method.It consists in the formation of a multilayer film on the surface of the membrane thanks to the alternateadsorption of polyelectrolytes having an opposite charge (poly(allylamine hydrochloride) andpoly(styrene sulfonate)). The properties of these modified membranes and the properties of the polymerfilm are then characterized. After that, the filtration performances of the modified membranes are testedby filtering the aqueous solutions containing either single ion or mixed-ions solutions. The long-termperformance of the modified membranes is also studied to demonstrate their capacity to filter thepolluted solutions several times successively. The filtration technique is then coupled with adsorptionon the modified silica particles, in order to increase the retention rates of metallic ions after the filtrationprocess. This results in a very performant two-steps treatment.The second functionalization method used is the plasma polymerization. Thus, poly(allylamine)films are deposited on membranes using this technique with various operating conditions. It is shownthat the use of a low plasma power during the polymerization leads to the films containing the highestamount of amines, which allow the membranes modified with this film to be very efficient to removemetallic ions from aqueous solutions thanks to the chelation properties of amines towards such ions.
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Submitted on : Monday, September 24, 2018 - 10:42:24 AM
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  • HAL Id : tel-01879636, version 1



Mohd Akmali Mokhter. Modification de membranes par des films polymères : Application à la décontamination de solutions aqueuses contenant des ions métalliques. Polymères. Université Bourgogne Franche-Comté, 2017. Français. ⟨NNT : 2017UBFCD079⟩. ⟨tel-01879636⟩