Title
Sinteza, karakterizacija i fotokatalitička primena nanočestica stroncijum-gadolinijum-oksida dopiranih jonima retkih zemalja
Creator
Stamenković, Tijana, 1988-
CONOR:
119131401
Copyright date
2024
Object Links
Select license
Autorstvo-Nekomercijalno-Bez prerade 3.0 Srbija (CC BY-NC-ND 3.0)
License description
Dozvoljavate samo preuzimanje i distribuciju dela, ako/dok se pravilno naznačava ime autora, bez ikakvih promena dela i bez prava komercijalnog korišćenja dela. Ova licenca je najstroža CC licenca. Osnovni opis Licence: http://creativecommons.org/licenses/by-nc-nd/3.0/rs/deed.sr_LATN. Sadržaj ugovora u celini: http://creativecommons.org/licenses/by-nc-nd/3.0/rs/legalcode.sr-Latn
Language
Serbian
Cobiss-ID
Theses Type
Doktorska disertacija
description
Datum odbrane: 18.10.2024.
Other responsibilities
Academic Expertise
Prirodno-matematičke nauke
Academic Title
-
University
Univerzitet u Nišu
Faculty
Prirodno-matematički fakultet
Group
Odsek za hemiju
Alternative title
Synthesis, characterization and photocatalytic application of strontium-gadolinium-oxide nanoparticles doped with rare earth ions
Publisher
[T. T. Stamenković]
Format
187 listova
description
Bibliografija: listovi 179 -183
Biografija sa bibliografijom: listovi 176-178
description
Chemistry
Abstract (en)
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.
Authors Key words
Nanomaterijali, stroncijum-gadolinijum-oksid, joni retkih zemalja, luminescencija, fotokataliza
Authors Key words
Nanomaterials, strontium gadolinium oxide, rare-earth ions, luminescence, photocatalysis
Classification
542.913:(661.843+661.866.2)
544.526.5:(661.843+661.866.2)
Subject
T 150
Type
Tekst
Abstract (en)
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.
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