Naslov
The effect of experimental conditions on the microstructure of hematite particles precipitated by the forced hydrolysis of FeCl3 solutions

Autori
Štajdohar, Jasenka ; Ristić, Mira ; Musić, Svetozar

Izvornik
Journal of molecular structure (0022-2860) 1044 (2013), SI; 290-298

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
hematite; amidosulfonic acid; XRD; Mössbauer; FT-IR; UV/Vis/NIR; FE-SEM

Sažetak
The effect of experimental conditions on the forced hydrolysis of FeCl3 solutions and specifically the effect of amidosulfonic acid on the microstructure of precipitates were investigated. Precipitates were analyzed by XRD, 57Fe Mössbauer, FT-IR and UV/Vis/NIR spectroscopies, as well as FE-SEM. The phase transformation β-FeOOH → α-Fe2O3 was accelerated with an increase in the hydrolysis temperature, whereas an addition of amidosulfonic acid at the start of the hydrolysis of Fe3+ ions suppressed the phase transformation β-FeOOH → α-Fe2O3 or decreased crystallinity at 120 and 160 °C. The size and shape of hematite particles were strongly dependent on FeCl3 concentration and temperature and the presence of sulfonate/sulfate groups. Preferential adsorption of sulfonate/sulfate groups influenced the hematite crystal growth direction. The aggregation effect was also noticed in the formation of hematite particles.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

Napomena
Rad je prezentiran na skupu XXXIst European Congress on Molecular Spectroscopy "Molecular spectroscopy and molecular structure 2012", održanom od 26.–31.08.2012.g., Cluj-Napoca, Rumunjska.

POVEZANOST RADA