Post-graduate theses

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Identifier	000399051
Title	Μεσοπορώδη πολυμεταλλο-οργανικά πλέγματα.Σύνθεση, χαρακτηρισμός και εφαρμογές στη φωτοκαταλυτική οξείδωση αλκοολών
Author	Κουτσουρούμπη, Ειρήνη
Thesis advisor	Αρματάς, Γεράσιμος
Reviewer	Βελώνια, Καλλιόπη Λυκάκης, Ιωάννης
Abstract	In the present thesis work, we present the synthesis of mesoporous framework materials comprising lacunary 11-silicotungstate ([SiW11O39]8− or SiW11) polyoxometalate clusters covalently connected by ethane-bridged silsesquioxane linkers through a block copolymer-templated cross-linking polymerization of 1,2-bis(triethoxysilyl)ethane (BTSE) in acid solution. Structural characterization by X-ray diffraction (XRD), transmission electron microscopy (TEM) and nitrogen porosimetry showed a well-organized mesostructure with large internal surface area and uniform pores. Also, the molecular structure of Keggin polyoxometalate anions SiW11 incorporated in the hybrid matrix, was confirmed by elemental X-ray microanalysis (EDS) and infrared (FT-IR), ultraviolet-visible (UV/vis) and Raman spectroscopy. Catalytic studies demonstrated that these new hybrid materials, which exhibit a high density of catalytic sites, large pore surface and ordered pore structure, are shown to be highly effective in the photocatalytic oxidation of aryl alcohols. They exhibit excellent activity and chemical stability in the photocatalytic oxidation of various para-substituted benzyl-alcohols and 1-phenyl-ethanols to the corresponding aldehydes and ketones, respectively, under UV-visible (λ > 360 nm) light irradiation, using molecular oxygen as oxidant.
Language	Greek
Issue date	2015-11-20
Collection	School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
	Type of Work--Post-graduate theses
Permanent Link	https://elocus.lib.uoc.gr//dlib/d/f/2/metadata-dlib-1454491881-192103-27309.tkl
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