| Title: | Synthesis of Hierarchical Zeolites with Morphology Control: Plain and Hollow Spherical Beads of Silicalite-1 Nanosheets |
| Author(s): | Moukahhal K; Lebeau B; Josien L; Galarneau A; Toufaily J; Hamieh T; Daou TJ; |
| Address: | "University of Haute Alsace (UHA), CNRS, Axe Materiaux a Porosite Controlee (MPC), Institut de Science des Materiaux de Mulhouse (IS2M), UMR 7361, F-68093 Mulhouse, France. University of Strasbourg (UniStra), F-67000 Strasbourg, France. Laboratory of Materials, Catalysis, Environment and Analytical Methods Faculty of Sciences, Section I, Lebanese University Campus Rafic Hariri, Hadath, Lebanon. ICGM, University of Montpellier, CNRS, ENSCM, 34296 Montpellier, France" |
| DOI: | 10.3390/molecules25112563 |
| ISSN/ISBN: | 1420-3049 (Electronic) 1420-3049 (Linking) |
| Abstract: | "Binderless pure silica zeolites (zeosils) spheres and hollow spheres with a diameter of 20 microm composed of silicalite-1 nanosheets particles were prepared by pseudomorphic transformation of spherical silica beads using different temperatures (110, 130, and 150 degrees C) and treatment times (1-5 days) in order to adapt the local dissolution rate of silica to the crystallization rate of silicalite-1 nanosheets allowing to preserve the initial morphology of the silica beads. Fully crystalline beads of 20 microm were obtained at 110 degrees C for 5 days, whereas hollow spheres similar in size were synthesized at higher temperatures. The crystallization process seems to begin at the outer surface of the amorphous silica beads and spreads with the time in the interior of the beads leading to a dissolution of the inner amorphous part of the beads to create zeosil hollow spheres for the highest treatment temperatures (130 and 150 degrees C). The dissolution rate of the inner amorphous part of the beads increases by increasing the hydrothermal treatment temperature from 130 to 150 degrees C. The silicalite-1 beads synthesized at 110 degrees C for 5 days showed to be promising for rapid molecular decontamination by adsorbing n-hexane in larger amount than the silicalite-1 conventional big crystals in powder forms" |
| Keywords: | "Adsorption Air Pollutants Chemistry/*methods Crystallization Hexanes/chemistry Hot Temperature Kinetics Microscopy, Electron, Scanning Microscopy, Electron, Transmission Nanoparticles/*chemistry Nanostructures/*chemistry Particle Size Powders Silicon Diox;" |
| Notes: | "MedlineMoukahhal, Kassem Lebeau, Benedicte Josien, Ludovic Galarneau, Anne Toufaily, Joumana Hamieh, Tayssir Daou, T Jean eng Switzerland 2020/06/04 Molecules. 2020 May 31; 25(11):2563. doi: 10.3390/molecules25112563" |
