Pregled bibliografske jedinice broj: 377612
Precipitation of hematite from dense beta-FeOOH suspensions with ammonium amidosulfonate adding
Precipitation of hematite from dense beta-FeOOH suspensions with ammonium amidosulfonate adding // Book of abstracts of EUCMOS 2008 / Musić, Svetozar ; Ristić, Mira ; Krehula, Stjepko (ur.).
Zagreb, 2008. str. 182-182 (poster, međunarodna recenzija, sažetak, znanstveni)
CROSBI ID: 377612 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Precipitation of hematite from dense beta-FeOOH suspensions with ammonium amidosulfonate adding
Autori
Žic, Mark ; Ristić, Mira ; Musić, Svetozar
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Book of abstracts of EUCMOS 2008
/ Musić, Svetozar ; Ristić, Mira ; Krehula, Stjepko - Zagreb, 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
alpha-Fe2O3; beta-FeOOH; 57Fe Mossbauer; FT-IR; XRD; FE SEM
Sažetak
Precipitation of hematite (alpha-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 alpha-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 alpha-Fe2O3 in high quantities. However, in the later case it is more difficult to control the size and shape of alpha-Fe2O3 particles. In the present work we have investigated precipitation of alpha-Fe2O3 particles from dense beta-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 alpha-Fe2O3, geometrical shape and size of alpha-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 alpha-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
Projekti:
098-0982904-2952 - Sinteza i mikrostruktura metalnih oksida i oksidnih stakala (Ristić, Mira, MZOS ) ( CroRIS)
Ustanove:
Institut "Ruđer Bošković", Zagreb
