Synthesis of FAU-Type Zeolite Membranes with Antimicrobial Activity.
Fiche publication
Date publication
juillet 2020
Journal
Molecules (Basel, Switzerland)
Auteurs
Membres identifiés du Cancéropôle Est :
Dr PIEUCHOT Laurent
Tous les auteurs :
Daou TJ, Dos Santos T, Nouali H, Josien L, Michelin L, Pieuchot L, Dutournie P
Lien Pubmed
Résumé
In this study, a layer of a pure and dense phase of FAU-type zeolite was synthesized directly on the surface of α-AlO plane macroporous support. Before hydrothermal synthesis, a step of cleaning of the support by an anionic detergent was performed, a roughness surface is created, allowing the anchoring of the zeolite nuclei and then their growth, favoring in this sense the formation of a homogeneous zeolite layer. The obtained membranes were fully characterized using X-ray diffraction analysis (XRD), nitrogen sorption, scanning electron microscopy (SEM), and mercury porosimetry. After 24 h of thermal treatment at 75 °C, a homogeneous zeolite layer composed of bipyramidal crystals of FAU-type zeolite is obtained with a thickness of about 2.5 µm. No obvious defects or cracks can be observed. It was found that the increase in heating temperature could lead to the appearance of an impurity phase, GIS-type zeolite. Then the ideal zeolite membrane was exchanged with Ag or Zn cations to studies their antimicrobial properties. Zeolites membranes exchanged with Ag showed an agar-diffusive bactericidal activity against gram negative () bacteria. Zn exchanged zeolite membrane presented a bacteriostatic activity that is less diffusive in agar. As expected, non-exchanged zeolite membrane (in its Na form) have no effect on bacterial activity. This process is particularly interesting for the synthesis of a good quality FAU-type zeolite membranes with antimicrobial properties.
Mots clés
FAU-type zeolite, bactericidal activity, in-situ synthesis, ionic exchange, membrane, zeolites
Référence
Molecules. 2020 Jul 28;25(15):