20.500.12556/RUL-190771 Fotokatalizna aktivnost imobiliziranega TiO2 na poliHIPE nosilce Photocatalytic activity of immobilized TiO2 on polyHIPE carrier V magistrskem delu sem raziskoval pripravo, funkcionalizacijo in karakterizacijo poroznih polimernih materialov poliHIPE ter njihovo uporabo pri fotokatalitski razgradnji bisfenola A (BPA) v vodni raztopini. PoliHIPE so bili pripravljeni z monomeroma glicidil metakrilatom (GMA) in etilenglikol dimetakrilatom (EGDMA) s polimerizacijo emulzije z visokim deležem notranje faze. Monolitne nosilce sem modificiral na dva načina, in sicer z dodajanjem titanovega dioksida v vodno fazo emulzije med samo sintezo in z naknadno obdelavo poliHIPE s titanovim(IV) butoksidom, nato pa preučeval vpliv pogojev modifikacije na lastnosti nastalih materialov. Morfologija in elementna sestava vzorcev sta bili analizirani z vrstično elektronsko mikroskopijo (SEM) in energijsko disperzijsko rentgensko spektroskopijo (EDS). Pretočne lastnosti polimerov sem ovrednotil s kromatografskimi meritvami, vsebnost anorganskega dela pa s termogravimetrično analizo. Rezultati so pokazali, da koncentracija TiBu pomembno vpliva na nastanek in količino titanovih struktur, ki se prednostno odlagajo na zunanji površini poliHIPE. Pri višjem pretoku titanovega prekurzorja so delci opazni tudi v notranjosti porozne strukture polimera. Pri vzorcih z neposredno dodanim TiO₂ sem ugotovil, da je bila značilna porozna struktura ohranjena. Pri nižji koncentraciji TiO₂ so bili delci razmeroma enakomerno razporejeni, pri desetkrat višji koncentraciji pa so nastajali večji aglomerati na stenah por. Prisotnost titana je bila potrjena tudi z analizo EDS. Termogravimetrična analiza je prav tako pokazala povečanje deleža anorganskega ostanka z naraščajočo koncentracijo uporabljenega prekurzorja oziroma dodanega titanovega dioksida. Pri preučevanju interakcij med BPA in poliHIPE sem ugotovil, da pH raztopine pomembno vpliva na zadrževanje BPA na polimerni koloni. Pri nekorigiranem pH raztopine se je na polimeru izrazito zadrževal BPA, medtem ko se pri vrednosti pH 12 na polimer ne veže skoraj nič BPA. Fotokatalitsko razgradnjo BPA sem spremljal z UV-Vis spektrofotometrijo, ki je pokazala, da pretočni sistem ni omogočal zadostne fotokatalitske razgradnje BPA zaradi prekratkega zadrževalnega časa. Pri nadaljnjih eksperimentih je bil zato uporabljen šaržni sistem, pri katerem se je po 300 minutah UV obsevanja koncentracija BPA zmanjšala za 86 %. Časovno odvisnost koncentracije sem opisal z modelom kinetike psevdo-prvega reda z navidezno konstanto hitrosti 0,0070 min⁻¹. In my master's thesis, I investigated the preparation, functionalization, and characterization of porous polyHIPE polymer materials and their application in the photocatalytic degradation of bisphenol A (BPA) in an aqueous solution. The polyHIPE materials were prepared using glycidyl methacrylate (GMA) and ethylene glycol dimethacrylate (EGDMA) as monomers through the polymerization of a high internal phase emulsion. I modified the monolithic supports using two different methods: by adding titanium dioxide (TiO₂) to the aqueous phase of the emulsion during synthesis and by subsequently treating the polyHIPE materials with titanium(IV) butoxide (TiBu). I then investigated the influence of the modification conditions on the properties of the resulting materials. The morphology and elemental composition of the samples were analyzed using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). I evaluated the flow properties of the polymers using chromatographic measurements, while the inorganic content was determined by thermogravimetric analysis. The results showed that the concentration of TiBu significantly affects the formation and quantity of titanium-containing structures, which are preferentially deposited on the outer surface of the polyHIPE materials. At a higher flow rate of the titanium precursor, particles were also observed within the internal porous structure of the polymer. For samples with TiO₂ added directly during synthesis, I found that the characteristic porous structure was preserved. At a lower TiO₂ concentration, the particles were relatively uniformly distributed, whereas at a tenfold higher concentration, larger agglomerates formed on the pore walls. The presence of titanium was also confirmed by EDS analysis. Thermogravimetric analysis further showed an increase in the proportion of inorganic residue with increasing concentrations of the precursor or the amount of added titanium dioxide. When investigating the interactions between BPA and the polyHIPE materials, I found that the pH of the solution significantly affects BPA retention on the polymer column. At the unadjusted pH of the solution, all the injected BPA was retained on the polymer, whereas at pH 12, almost no BPA was retained. The photocatalytic degradation of BPA was monitored using UV–Vis spectrophotometry, which showed that the flow-through system was ineffective due to insufficient residence time. Therefore, a batch system was used in subsequent experiments, in which the BPA concentration decreased by 86 % after 300 minutes of UV irradiation. The time-dependent change in BPA concentration was described using a pseudo-first-order kinetic model, with an apparent rate constant of 0.0070 min⁻¹. poliHIPE bisfenol A fotokataliza titanov dioksid titanov(IV) butoksid polyHIPE bisphenol A photocatalysis titanium dioxide titanium(IV) butoxide true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-11-03 15:25:05 2026-11-03 15:25:22 2026-11-04 04:07:22 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 25733 Kucis_Niko_-_Fotokatalizna_aktivnost_imobiliziranega_TiO2_na_poliHIPE_nosilce.pdf Kucis_Niko_-_Fotokatalizna_aktivnost_imobiliziranega_TiO2_na_poliHIPE_nosilce.pdf 1 1C9EEE74F0B4738804A2DB47F0443394 e3533807608bc6d3c0431cae5c639b6274c08466ee6dc8c7862218faaa8653ee 575c87b3-d792-11f1-aea2-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=252401 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0