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Identifier 000376479
Title Ανάπτυξη και χαρακτηρισμός σύνθετων μεσοπορώδων πλεγμάτων TiO2/CdS και πολυοξομεταλλικών πλειάδων. Εφαρμογές στη φωτοκαταλυτική οξείδωση οργανικών μορίων
Alternative Title Development and characterization of mesoporous TiO2/CdS and Ti02/[W10O32] composite framework. Applications in oxidation of organic compounds
Author Ταμιωλάκης, Ιωάννης Εμμανουήλ
Thesis advisor Αρματάς, Γεράσιμος
Reviewer Βαμβακάκη, Μαρία
Λυκάκης, Ιωάννης
Abstract Nanostructured arrays of titanium dioxide nanoparticles (NPs) having large internal surface area and uniform pore size are of immense interest for applications in photocatalysis, optoelectronics and chemical sensing. In this work, a facile synthesis of mesoporous anatase-titania via a surfactant-assisted aggregating assembly of TiO2 NPs is presented. These mesostructures possess a highly crystalline anatase phase, large and accessible pore surface area. The synthesis accomplished in a one-step chemical process, in which the crystallization and organization of TiO2 NPs into three-dimensional assembled mesostructures occur together. We have demonstrated the versatility of this method by producing mesoporous assemblies with controlled pore size as well as mesoporous heterostructures from interconnected CdS and TiO2 NPs (CdS-MTA) or polyoxometalate (POM) clusters (WA-MTA). The chemical composition and porosity of these mesophases were characterized by various techniques, such as TGA, SAXS, XRD, TEM, EDS, UV-vis and nitrogen porosimetry. Catalytic experiments revealed that MTA are good photocatalysts, showing superior activity and stability in visible-light-driven oxidation of 1-phenylethanol. The heterostructures WA-MTA showed reactivity in oxidative decomposition of organic pollutant Methylene Blue. Indeed, the catalytic activity of WA-MTA is highly dependent on the amount of included POM clusters and increases with increasing [W10O32]4- loading.
Language Greek
Subject Oxidation polyoxometalate
Πολυοξομεταλλικές πλειάδες
Issue date 2012-11-16
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
  Type of Work--Post-graduate theses
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