Naslov
Structural and photocatalytical properties of hydrothermally synthesized iron/titanium oxide nanoparticles

Autori
Marić, Ivan ; Štefanić, Goran ; Gotić, Marijan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Twenty-fifth Slovenian-Croatian Crystallographic Meeting : Book of Abstracts and Programme / - Ljubljana : University of Ljubljana, Faculty of Chemistry and Chemical technology, 2017, 69-69

Skup
Twenty-fifth Slovenian-Croatian Crystallographic Meeting

Mjesto i datum
Ljubljana, Slovenija, 14.06.2017. - 18.06.2017

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
iron ; titanium oxide ; nanoparticles ; anatase ; hematite ; photocatalytical activity ; X-ray diffraction, Mössbauer spectroscopy ; methylene blue

Sažetak
Iron/titanium oxide nanoparticles with initial molar ratio [Fe(Fe+Ti)]  0.5 were hydrothermally synthesized at 180 C in aqueous ammonia solution (pH = 9). The titanium and iron precursors were TiCl4 and FeCl3, respectively. The obtained samples were analysed at room temperature using X-ray diffraction (XRD), Raman and Mössbauer spectroscopies, field emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectrometry. The amount of doped iron strongly affected structural properties as well as dispersion of iron in Fe-Ti-O system. Anatase was the dominant phase in the iron/titanium oxide samples with [Fe(Fe+Ti)]  0.25. The iron/titanium oxide sample with [Fe(Fe+Ti)]  0.5 contained no anatase. The average crystallite size of the anatase phase in iron/titanium oxide samples decreased with the increase of iron doping. The appearance of the small diffraction lines of hematite in the product with 10 mol% of the iron indicates that the solid solubility limit of Fe3+ ions in the TiO2 lattice has been reached. However, the results of precise unit-cell parameters measurement, obtained using both Rietveld and Le Bail refinements of the powder diffraction patterns with added silicon as an internal standard, show that the unit cell-volume of anatase increase with the increase of iron content up to 15 mol%. Iron that could not be incorporated in the TiO2 lattice separated in the form of hematite (alfa-Fe2O3) as shown using XRD and Mössbauer spectroscopy. The photocatalytical activities of synthesized samples were investigated using Methylene blue organic dye as a model pollutant.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA