20.500.12556/DKUM-82316 Sinteza funkcionaliziranih magnetnih nanodelcev z mikrovalovno pečico za uporabo v procesu napredne osmoze diplomsko delo univerzitetnega študijskega programa I. stopnje Synthesis of functionalized magnetic nanoparticles with microwave oven for application in forward osmosis Konvencionalne tehnologije čiščenja vode so v preteklih letih zelo pripomogle k čiščenju odpadnih voda, vendar so vedno večje potrebe po čisti pitni vodi te tehnologije potisnile do njihovih skrajnih meja. Ena izmed rešitev problema čiščenja vode je proces napredne osmoze, ki za svoje delovanje potrebuje gonilno raztopino, ki ustvarja ustrezen osmotski tlak. V sklopu diplomske naloge smo sintetizirali magnetne nanodelce (MND) v mikrovalovni pečici in jih uspešno funkcionalizirali s (poli)akrilno kislino. Preučevali smo, kako vplivata čas in temperatura sinteze na končni osmotski tlak pripravljenih raztopin. Potrdili smo, da tako daljši čas kot tudi višja temperatura pri sintezi pripomoreta k višjemu osmotskemu tlaku raztopine MND. Visoki osmotski tlaki sintetiziranih magentnih nanodelcev nakazujejo, da bi takšne raztopine lahko uporabili kot gonilne raztopine v procesu napredne osmoze. MND smo karakterizirali s Fourierovo transformacijsko infrardečo spektroskopijo (FTIR), termogravimetrično analizo (TGA), dinamičnim sipanjem svetlobe (DLS), rentgensko praškovno difrakcijo (RTG) ter z merjenjem osmotskega tlaka. S pomočjo karakterizacije smo ugotovili, da so sintetizirani nanodelci mešanica goetita in maghemita. V diplomski nalogi so predstavljeni rezultati in meritve vseh opravljenih sintez, kot tudi diskusija rezultatov. Conventional water treatment technologies have made a significant contribution to wastewater treatment over the pase years, but the increasing demand for clean drinking water has pushed these technologies to their limits. One solution to the water treatment problem is the forward osmosis process, which requieres drive solutions to generate the sufficient osmotic pressure. In this work, magnetic nanoparticles were synthesised in a microwave oven and successfully functionalized with poly(acrylic acid). We investigated how the time and temperature of synthesis affect the final osmotic pressure of the synthesised solutions. We confirmed that longer synthesis time and higher synthesis temperature lead to higher osmotic pressure of the magnetic nanoparticle solution. The high osmotic pressures of the synthesised solutions indicate that these solutions could be used as driving solutions in the forward osmosis process. The magnetic nanoparticles were characterised by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), dynamic light scattering (DLS), X – ray diffraction (RTG) and osmotic pressure measurements. The characterization revealed that the synthesised nanoparticles are a mixture of goethite and maghemite. The results and measurements of all the syntheses we performed, as well as a discussion of the results, are presented in the thesis. Graphs and figures are shown to illustrate the work that has been carried out. magnetni nanodelci poli(akrilna kislina) mikrovalovna sinteza napredna osmoza osmotski tlak magnetic nanoparticles poly(acrylic acid) microwave synthesis forward osmosis osmotic pressure true true false [M. Kočevar] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2022-08-13 19:00:45 2022-09-14 12:55:56 2022-11-23 03:06:21 0000-00-00 00:00:00 2022 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (X, 41 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.352.4:[66.091.3:621.318.1](043.2) 130436611 UN_Kocevar_Meta_2022.pdf UN_Kocevar_Meta_2022.pdf 1 8F2D5F2CAAE808A1551B41E2AB0D5960 49c8e4017562115637acff630156b700779856beb0f04c951cc77a6c938c7b9f 0e6c6242-3408-11ed-b8ac-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=162625 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0