Naslov
Precipitation of Hematite from Dense b-FeOOH Suspensions with Ammonium Amidosulfonate Adding

Autori
Žic, Mark ; Ristić Mira ; Musić, Svetozar

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

Izvornik
EUCMOS 2008, XXIX European Congress on Molecular Spectroscopy, Book of Abstracts / Musić, Svetozar ; Ristić, Mira, Krehula, Stjepko - Zagreb : Institut Ruđer Bošković, 2008, 182-182

ISBN
978-953-6690-76-3

Skup
XXIX European Congress on Molecular Spectroscopy

Mjesto i datum
Opatija, Hrvatska, 31.08.2008. - 05.09.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
a-Fe2O3; b-FeOOH; FT-IR; XRD; FE-SEM; EDS

Sažetak
Precipitation of hematite (a-Fe2O3) from aqueous solutions has been the subject of many investigations. The hydrolysis of aqueous Fe(III)-salt solutions, microemulsion hydrolysis, sol-gel or crystallization from ferrihydrite were used in the synthesis of a-Fe2O3. Some precipitation methods are limited due to small yield and they can be only of academic interest. On the other hand, the crystallization from concentrated aqueous Fe(III)-salts solutions yields a-Fe2O3 in high quantities. However, in the later case it is more difficult to control the size and shape of a-Fe2O3 particles. In the present work we have investigated precipitation of a-Fe2O3 particles from dense b-FeOOH suspensions in the presence of amidosulfonate anion in hydrothermal conditions at 160 oC. The samples were characterized with 57Fe Mössbauer, FT-IR, XRD, FE-SEM and EDS. The kinetics of crystallization of a-Fe2O3, geometrical shape and size of a-Fe2O3 particles were depending on the concentration of ammonium amidosulfonate added at the start of the precipitation process. Aggregation effect plays an important role in the formation of a-Fe2O3 particles. It was also concluded that geometrical shape and size of primary as well as secondary particles were influenced by the preferential adsorption of sulfonate groups at acidic conditions in dense suspension.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA