Sinteza i karakterizacija nanostrukturiranog TiO2 dopiranog sa srebrom

Sambolek, Anamarija (2017) Sinteza i karakterizacija nanostrukturiranog TiO2 dopiranog sa srebrom. = Synthesis and characterization of nanostructured silver doped TiO2. Master's thesis (Bologna) , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Ćurković, Lidija.

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Abstract (Croatian)

U ovom su radu hidrotermalnom sintezom nanokristaliničnih prahova titanijevog dioksida (TiO2) dopiranih srebrom pripravljena tri uzorka (uzorak 1, uzorak 2 i uzorak 3). Za pripravu koloidne otopine (sola) upotrijebljeni su: titanijev izopropoksid (prekursor), 2-propanol (otapalo), octena kiselina (katalizator), acetilaceton (sredstvo za kompleksiranje), natrijev bor hidrid (redukcijski reagens) te srebrov nitrat (izvor srebra). Za karakterizaciju pripravljenih nanokristaliničnih TiO2 prahova dopiranih srebrom korištena je infracrvena spektroskopija s Fourierovom transformacijom (FTIR) i Ramanova spektroskopija. Rendgenskom difrakcijskom analizom prašaka (PXRD) određen je fazni sastav i veličina kristalita. Cilj je bio ispitati mogućnost primjene sintetiziranog TiO2 kao fotokatalizatora u naprednim oksidacijskim procesima za razgradnju farmaceutika u vodama primjenom zračenja sličnog Sunčevom. Ispitana je hidrolitička razgradnja nitrofurantoina, antibiotika namijenjenog liječenju urinarnih infekcija, heterogenom fotokatalizom s tri različita nanokristalinična praha TiO2 dopirana srebrom te jednim komercijalnim TiO2 prahom (P25) koji je korišten za usporedbu fotokatalitičkih svojstava sintetiziranih prahova. Rezultati ispitivanja pokazali su da je hidrolitička razgradnja nitrofurantoina moguća primjenom svih uzoraka TiO2 uz zračenje slično Sunčevom zračenju (sadrži vidljivu i UV komponentu). Najbolju fotokatalitičku aktivnost u razgradnji nitrofurantoina primjenom VIS zračenja (vidljivo zračenje, bez UV komponente) postignuta je primjenom uzorka 1. Slaba fotokatalitička aktivnost postignuta je komercijalnim uzorkom TiO2, dok uzorci 2 i 3 nisu fotokatalitički aktivni primjenom VIS zračenja.

Abstract

In this investigation, three samples (Sample 1, Sample 2, Sample 3) of silver-doped titania (TiO2) were prepared by hydrothermal synthesis. Chemicals used for the preparation of this colloidal suspension (sol) were: titanium isopropoxide (precursor), 2-propanol (solvent), acetic acid (catalyst), acetylacetone (complexing agent), sodium borohydride (reduction agent), as well as silver nitrate (source of silver). Prepared nanocrystalized silver-doped titania powders were characterized by means of Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. Powder X-ray diffraction (PXRD) was used to determine the phase composition and the size of the crystallites. The main goal was to examine the possible application of the synthesized TiO2 as a catalyst for the pharmaceuticals degradation in the advanced oxidation processes in water, under the solar-like radiation. Hydrolytic degradation of nitrofurantoin, an antibiotic used to treat urinary tract infections, by means of heterogeneous photocatalyst with three different nanocrystalline silver-doped TiO2 powders and one commercial TiO2 powder (P25), used for the comparison of the synthesized powders’ photocatalytic properties. Obtained results showed that the hydrolytic degradation of the nitrofurantoin with the solar-like radiation (consists of visible light and UV component) was possible for all three titania samples. The best photocatalytic activity in the nitrofurantoin degradation under the VIS radiation (visible light, without the UV component) was achieved with the Sample 1. Low photocatalytic activity was achieved with the commercial titania sample, while Samples 2 and 3 showed no photocatalytic activity under the VIS radiation.

Item Type: Thesis (Master's thesis (Bologna))
Uncontrolled Keywords: TiO2; hidrotermalna sinteza; dopiranje srebrom; fotokataliza; nitrofurantoin; Sunčevo zračenje; vidljivo zračenje
Keywords (Croatian): TiO2; hydrothermal synthesis; silver-doping; photocatalysis; nitrofurantoin; solar radiation; visible radiation
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 1000 Department of Materials > 1010 Chair of Materials and Tribology
Date Deposited: 13 Jul 2017 07:28
Last Modified: 17 Mar 2020 08:59
URI: http://repozitorij.fsb.hr/id/eprint/7804

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