Naslov
Monitoring the hydrothermal precipitation of α-Fe2O3 from concentrated Fe(NO3)3 solutions partially neutralized with NaOH

Autori
Žic, Mark ; Ristić, Mira ; Musić, Svetozar

Izvornik
Journal of molecular structure (0022-2860) 993 (2011), 1/3; 115-119

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

Ključne riječi
α-Fe2O3 ; XRD ; Mössbauer ; FT-IR ; Electron microscopy

Sažetak
The influence of amidosulfonate anion on the crystallization of α-Fe2O3 from a dense ferrihydrite suspension in an acidic pH medium was investigated using XRD, 57Fe Mössbauer and FT-IR spectroscopies and FE-SEM + EDS. The ferrihydrite suspensions contained traces or a small amount of α-FeOOH. A reference ferrihydrite suspension was obtained by partial neutralization of Fe(NO3)3 solutions with a concentrated NaOH solution and brief autoclaving at 160 °C. Upon a prolonged autoclaving time a mixture of pseudospheric α-Fe2O3 particles was produced. The addition of amidosulfonate anion into the reference precipitation system suppressed the formation of α-Fe2O3 particles and completely changed the shape of the particles. Near spindle-shaped and hollow α-Fe2O3 particles were produced consisting of elongated primary α-Fe2O3 particles which were laterally arrayed, thus forming hollow particles. The elongation of primary α-Fe2O3 particles according to the crystallographic c-axis was caused by the specific adsorption of sulfate anions perpendicular to the c-axis. Sulfate anions were formed by the decomposition of amidosulfonates in the precipitation system.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

Napomena
Rad je prezentiran na skupu XXXth European Congress on Molecular Spectroscopy, održanom od 29.08.-03.-09.2010., Firenca, Itallija.

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