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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

Photocatalysis

Μεσοπορώδη

Οξείδωση

Πολυοξομεταλλικές πλειάδες

Φωτοκατάλυση

Issue date

2012-11-16

Collection