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Title:Sinteza novih sol-gel materialov za vezavo kovin redkih zemelj
Authors:ID Krajnc, Sara (Author)
ID Lobnik, Aleksandra (Mentor) More about this mentor... New window
ID Košak, Aljoša (Comentor)
Files:.pdf MAG_Krajnc_Sara_2018.pdf (4,33 MB)
MD5: 8C41FF52904F73F254C1A806E7634B28
PID: 20.500.12556/dkum/943d5c55-ffb1-4555-bb36-c3332ad2ff5b
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:Čeprav so kovine redkih zemelj zaradi svojih edinstvenih lastnosti bistvene surovine za široko paleto aplikacij oziroma industrijskih panog pa zaradi toksičnosti, biološke nerazgradljivosti in bioakumilacije negativno vplivajo na kakovost površinske in podtalne vode. Adsorpcija z uporabo različnih naravno in sintetično proizvedenih materialov spada trenutno med najučinkovitejše, selektivne ter ekonomsko in energetsko ustrezne metode za namen odstranjevanja ionov kovin iz voda. V magistrskem delu smo s sol-gel metodo pripravili funkcionalizirane SiO2 adsorpcijske materiale za vezavo in odstranjevanje Tb3+ ionov iz modelnih voda. V prvem koraku smo z bazično katalizirano reakcijo hidrolize in kondenzacije alkoksidnih prekurzorjev TEOS in APTMS pripravili funkcionalizirane (-NH2) SiO2 nanodelce. V nadaljevanju smo na enak način, vendar s kislinsko katalizirano reakcijo hidrolize in kondenzacije alkoksidnega prekurzorja TEOS v kombinaciji z alkoksidnim prekurzorjem DPTS pripravili tanke funkcionalne (-PO(OR)2) nanose nastalega sola na predhodno aktivirane steklene substrate. Na sol-gel adsorpcijski material smo vezali terbijeve ione (Tb3+), pri čemer smo ovrednotili pogoje adsorpcije (kontaktni čas, maksimalna adsorpcijska kapaciteta, masa adsorbenta, temperatura adsorpcije), adsorpcijo opisali s klasičnimi adsorpcijskimi izotermami ter ovrednotili kinetiko in termodinamiko adsorpcije. Sol-gel materiale in proces vezave Tb3+ ionov smo v vsaki stopnji karakterizirali z uporabo sodobnih karakterizacijskih tehnik (TEM, FTIR, BET, UV-VIS, TGA, fluorometrija, …). Rezultati so pokazali učinkovito vezavo (> 94 %) Tb3+ ionov na amino funkcionalizirane SiO2 nanodelce, medtem ko je bila vezava na fosfatno funkcionalizirane SiO2 nanose slabša (~16 %).
Keywords:sol-gel nanodelci, tetraetoksisilan, adsorpcija, kovine redkih zemelj, terbij
Place of publishing:Maribor
Publisher:[S. Krajnc]
Year of publishing:2018
PID:20.500.12556/DKUM-69627 New window
UDC:544.022.822:546.65(043.2)
COBISS.SI-ID:21299990 New window
NUK URN:URN:SI:UM:DK:7UIYHUZI
Publication date in DKUM:08.03.2018
Views:2193
Downloads:256
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:12.02.2018

Secondary language

Language:English
Title:Synthesis of the new sol-gel materials for binding rare-earth metals
Abstract:The rare earth metals are, due to their unique properties, the essential material for a wide range of applications and industries, although they have a negative impact on the quality of surface and groundwater due to their toxicity, nonbiodegradability and bioaccumulation. Adsorption with usage of variety of natural and synthetically produced materials is currently one of the most efficient, selective, economically and energetically appropriate methods for removal of metal ions from water. In this master thesis, functionalized SiO2 adsorption materials for the binding and removal of Tb3+ ions from model water were prepared by sol-gel method. In the first step, functionalized (-NH2) SiO2 nanoparticles were prepared with a basically catalysed hydrolysis and condensation of the alkoxide precursors TEOS and APTMS. In the following, the functional (-PO(OR)2) films were prepared with the acid-catalysed hydrolysis and condensation reaction of the TEOS precursor in combination with alkoxide precursor DPTS on pre-activated glass substrates. Sol-gel adsorption material was used to bind terbium ions (Tb3+), whereby adsorption conditions (contact time, maximum adsorption capacity, mass of the adsorbent, adsorption temperature) were evaluated. Adsorption process was described with conventional adsorption isotherms, kinetics and thermodynamics parameters. Sol-gel materials and binding process of Tb3+ ions were characterized using modern characterization techniques (TEM, FTIR, BET, UV-VIS, TGA, fluorometry…) The results showed effective binding (> 94 %) of Tb3+ ions to amino functionalized SiO2 nanoparticles, while binding to phosphate-functionalized films was less efficient (~ 16 %).
Keywords:sol-gel nanoparticles, tetraethoxysilan, adsorption, rare-earth metals, terbium


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