20.500.12556/DKUM-82489 Sinteza in uporaba maghemitnih nanodelcev funkcionaliziranih s polisaharidom za adsorpcijo elementov redkih zemelj magistrsko delo Synthesis and use of maghemite nanoparticles functionalized with polysaccharide for the adsorption of rare earth elements Magistrsko delo zajema sintezo magnetnih maghemitnih nanodelcev (MND), njihovo površinsko funkcionalizacijo s polisaharidom hondroitin sulfatom (HS) in raziskavo adsorpcije neodimovih (III) ionov (Nd3+) na magnetne nanoadsorbente. Namen magistrske naloge je bil ustvariti stabilne adsorbente, ki bi služili za vezavo in nadaljnjo regeneracijo elementov redkih zemelj (REE) iz vodnih raztopin. Magnetne nanoadsorbente smo karakterizirali s Fourierjevo transformirano infrardečo spektroskopijo na oslabljeni totalni odboj (ATR-FTIR), termogravimetrično analizo (TGA), dinamičnim sipanjem laserske svetlobe (DLS), X-žarkovno fotoelektronsko spektroskopijo (XPS), rentgensko praškovno difrakcijo (XRD), transmisijsko elektronsko mikroskopijo (TEM) in masno spektrometrijo sekundarnih ionov z analizatorjem na čas preleta (ToF-SIMS). Izvedene so bile magnetne meritve, meritve zeta potenciala, meritve skupnega organskega ogljika (TOC), naredili smo polielektrolitsko titracijo HS. Adsorpcijo nevezanega Nd3+ v supernatantu smo po odstranitvi magnetnih nanoadsorbentov merili z UV-VIS spektroskopijo. Tekom meritev smo preverjali vpliv kontaktnega časa, pH delovne raztopine in vpliv mase uporabljenega nanoadsorbenta. V tem magistrskem delu so zbrani podatki vseh sintez in funkcionalizacij, ki so bile izvedene. Podrobno so razloženi rezultati karakterizacij, podana je diskusija adsorpcije z vsemi slikami, grafi in tabelami, ki so nastale med izvajanjem eksperimentalnega dela. Rezultati kažejo, da se na funkcionalizirane MND adsorbirajo Nd3+, vendar sama metoda UV-VIS ni primerna za meritve adsorpcije v danem koncentracijskem območju delovnih raztopin in določitev adsorpcijske kapacitete. This master thesis covers the synthesis of magnetic maghemite nanoparticles (MND), their surface functionalization with the polysaccharide chondroitin sulfate (HS) and the investigation of the adsorption of neodymium (III) ions (Nd3+) on magnetic nanoadsorbents. The aim of the master thesis was to create stable adsorbents that would serve for the binding and subsequent recovery/regeneration of rare earth elements (REE) from aqueous solutions. The magnetic nanoadsorbents were characterized by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), thermogravimetric analysis (TGA), dynamic laser light scattering (DLS), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and time of flight secondary ion mass spectrometry (ToF-SIMS). Magnetic measurements, zeta potential measurements, total organic carbon (TOC) measurements and polyelectrolyte titration of HS were also performed. The adsorption of unbound Nd3+ in the supernatant was measured by UV-VIS spectroscopy after the removal of magnetic nanoadsorbents. The influence of contact time, pH of the working solution and the mass of the nanoadsorbent used were checked during the measurements. The data of all the syntheses and functionalisations carried out are collected in this master thesis. The results of the characterizations are explained in detail, a discussion of the adsorption is given with all the figures, graphs and tables that were made during the experimental work. The results show that Nd3+ is adsorbed on the functionalized MND, but the UV-VIS method itself is not suitable for adsorption measurements in the given concentration range of the working solutions and in the determination of adsorption capacity. maghemitni nanodelci hondroitin sulfat neodim adsorpcija UV-VIS spektroskopija maghemite nanoparticles chondroitin sulfate neodymium adsorption UV-VIS spectroscopy true true false [M. Rantaša] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2022-08-22 22:01:29 2022-09-09 13:39:51 2022-09-15 03:12:58 0000-00-00 00:00:00 2022 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (XI, 72 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 661.865.7.081.3:621.318.1(043.2) 121280771 MAG_Rantasa_Matjaz_2022.pdf MAG_Rantasa_Matjaz_2022.pdf 1 C4DCD9A9CA5F49C3669F61EDD475673C 0e9933aac013724dd22fb39e133b7e0728a2b9c814bbe978ac504152b7820979 f9ce2f24-301b-11ed-95b3-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=162209 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0