20.500.12556/DKUM-99973 Odstranjevanje antibiotika z uporabo kompozitnih magnetnih nanodelcev s pektinom Removal of antibiotics using composite magnetic nanoparticles with pectin Ostanki antibiotikov, med njimi fluorokinolona ciprofloksacina, so prisotni v vodnem okolju in prispevajo k širjenju bakterijske odpornosti, konvencionalne čistilne naprave pa jih odstranijo le delno. Obetavni Obetavnost predstavljajo so magnetni nanoadsorbenti, ki jih po uporabi ločimo s permanentnim magnetom. V diplomskem delu smo s koprecipitacijo iz vodne raztopine Fe2+ in Fe3+ ionov ob dodatku amoniaka sintetizirali magnetne nanodelce (MNPs) in jih površinsko funkcionalizirali s pektinom (MNPs@Pec). Materiale smo analizirali s transmisijsko elektronsko mikroskopijo (TEM), Fourierjevo transformacijsko infrardečo spektroskopijo z oslabljenim totalnim odbojem (ATR-FTIR), X-žarkovno fotoelektronsko spektroskopijo (XPS), meritvami zeta potenciala, termogravimetrično analizo (TGA) in magnetnimi meritvami z vibrirajočim vzorcem (VSM), vsebnost karboksilnih skupin pektina pa določili s potenciometrično titracijo. Odstranjevanje ciprofloksacina smo ovrednotili s šaržnimi adsorpcijskimi poskusi (8 mg/L, pH ≈ 7, kontaktna časa 2 h in 24 h) z UV-Vis spektrofotometrijo. Nanodelci (5–12 nm) imajo spinelno strukturo železovih oksidov. Prisotnost pektina so potrdili značilni signali pektina v ATR-FTIR-spektru kompozitaMNPs@Pec, XPS-spektri visoke ločljivosti ter premik izoelektrične točke s pH ≈ 8 na pH = 3,3–3,8; delež pektina po TGA znaša približno 13,3 mas. % (spodnja ocena). Oba materiala sta praktično superparamagnetna; nasičena magnetizacija se je znižala z 62,5 emu/g na 49,9 emu/g. MNPs@Pec je po 2 h odstranil 65,0 %, po 24 h pa 70,0 % ciprofloksacina, sami MNPs pa 49,4 % oziroma 43,0 %; padec pripisujemo desorpciji šibko vezanega antibiotika. Pektinska prevleka prispeva vezavna mesta za ciprofloksacin ter izboljša učinkovitost in obstojnost vezave, magnetne lastnosti pa omogočajo preprosto ločevanje adsorbenta iz vode, zato je MNPs@Pec obetaven material za odstranjevanje antibiotikov iz vodnih medijev. Antibiotic residues, including the fluoroquinolone ciprofloxacin, occur in aquatic environments and contribute to bacterial resistance, while conventional wastewater treatment removes them only partially. Magnetic nanoadsorbents are promising, as they are retrievable with a magnet. Magnetic nanoparticles (MNPs) were prepared by coprecipitation from a solution of Fe²⁺ and Fe³⁺ ions using ammonia and surface-functionalised with pectin (MNPs@Pec). The materials were analysed by transmission electron microscopy (TEM), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), zeta potential measurements, thermogravimetric analysis (TGA) and vibrating sample magnetometry (VSM); the carboxyl group content of pectin was determined by potentiometric titration. Ciprofloxacin removal was evaluated in batch adsorption experiments (nominal 8 mg/L, pH ≈ 7, contact times 2 h and 24 h) using UV-Vis spectrophotometry. The nanoparticles (5–12 nm) exhibited the spinel structure of iron oxides. Pectin presence was confirmed by characteristic ATR-FTIR signals, high-resolution XPS spectra, and the isoelectric point shift from approximately pH 8 to 3.3–3.8; the bound pectin content by TGA is approximately 13.3 wt. % (lower estimate). Both materials are practically superparamagnetic; the saturation magnetisation decreased from 62.5 to 49.9 emu/g. MNPs@Pec removed 65.0 % of ciprofloxacin after 2 h and 70.0 % after 24 h, MNPs only 49.4 % and 43.0 %; the decrease reflects desorption of weakly bound antibiotic. The pectin coating provides binding sites for ciprofloxacin and improves removal efficiency and binding stability, while the magnetic properties allow easy separation from water; MNPs@Pec is a promising material for removing antibiotics from aqueous media. magnetni nanodelci maghemit pektin ciprofloksacin adsorpcija čiščenje vode magnetic nanoparticles maghemite pectin ciprofloxacin adsorption water treatment true true false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-01 08:55:05 2026-09-22 16:45:31 2026-09-23 03:08:37 0000-00-00 00:00:00 2026 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 VS_Kurbus_Lara_2026.pdf VS_Kurbus_Lara_2026.pdf 1 6B9BAB592D49394C7C1D82724BDE5084 7eda67f092cd1917d417b10ffb3b0f2f47770ea05fab337153d1ff8829e58999 3fdf3694-b29b-11f1-9651-00155d0001be https://dk.um.si/Dokument.php?lang=slv&id=212778 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0