o:2795 Sinteza, karakterizacija i fotokatalitička primena nanočestica stroncijum-gadolinijum-oksida dopiranih jonima retkih zemalja Synthesis, characterization and photocatalytic application of strontium-gadolinium-oxide nanoparticles doped with rare earth ions : doctoral dissertation sr Within this dissertation, synthesis and investigation of the new multifunctional materials were done. Nanostructural powders, based on mixed strontium and gadolinium oxide (SrGd2O4) as matrix doped with rare earth ions (Dy3+, Sm3+, Yb3+, Er3+, Ho3+, Tm3+), were prepared. Combustion synthesis promoted with glycine was chosen to be the appropriate method for sample preparation, thus, optimization of the synthesis method was done in order to obtain powders with desirable characteristics. Five systems were prepared, each with a different dopant ion („down“-convertors) or a combination of two dopant ions („up“-convertors).Complete and thorough physico-chemical characterization was performed on each sample within one system. The influence of dopant concentration on structural, morphological, surface, and optical properties of as-synthesized material was examined. A particular accent was given to the investigation of the luminescence properties, therefore, quantum yield and luminescence lifetime were calculated for the „up“-convertors.As-synthesized samples were analyzed to be used in photocatalytic processes for water purification, more precisely, for photocatalytic degradation of organic dyes as model pollutants. „Down“-convertors were used in test reactions for photocatalytic degradation of Rhodamine B, whilst „up“-convertors were used in test reactions for photocatalytic degradation of Methylene blue. The mechanism of the photocatalytic reactions was also examined, as well as the influence of selected process parameters, in order to optimize the photocatalytic process.The obtained results indicate that materials with good luminescence properties also possess good photocatalytic activity, pointing to the successful synthesis of new multifunctional materials. Bibliografija: listovi 179 -183Biografija sa bibliografijom: listovi 176-178 Datum odbrane: 18.10.2024. Chemistry 91552100 155335945 91552101 8730 2024-12-30T08:56:49.053Z 45 no 46 Tijana, 1988- Stamenković 119131401 2024 63 mentor Маrjan S., 1982- Ranđelović 20939111 2024 63 član komisije Aleksandar, 1966- Bojić 13716327 2024 63 član komisije Aleksandra, 1975- Zarubica 11093863 2024 63 član komisije Aleksandar, 1971- Lolić 12822119 2024 63 član komisije Vesna, 1984- Lojpur 28350823 2024 187 listova 13066217 http://phaidrani.ni.ac.rs/o:2795 no yes 12 2024-12-30T08:56:49.320Z 70 Nanomaterijali, stroncijum-gadolinijum-oksid, joni retkih zemalja, luminescencija, fotokataliza Nanomaterials, strontium gadolinium oxide, rare-earth ions, luminescence, photocatalysis 542.913:(661.843+661.866.2)544.526.5:(661.843+661.866.2) T 150 1738 18A07 18A0703 2024