Characteristic of hydrous iron (III) oxides prepared by homogeneous precipitation of iron (III) sulphate with urea

0026668 - ÚACH 2006 RIV FR eng J - Journal Article
Bakardjieva, Snejana - Štengl, Václav - Šubrt, Jan - Večerníková, Eva
Characteristic of hydrous iron (III) oxides prepared by homogeneous precipitation of iron (III) sulphate with urea.
[Charakteristika oxidů Fe3 připravených homogenizací síranu železitého močovinou.]
Solid State Sciences. Roč. 7, č. 4 (2005), s. 367-374. ISSN 1293-2558. E-ISSN 1873-3085
R&D Projects: GA MŠMT(CZ) LN00A028; GA MPO(CZ) FD-K/005
Institutional research plan: CEZ:AV0Z40320502
Keywords : homogenous precipitation * uniform spherical particles * ferrihydrite
Subject RIV: CA - Inorganic Chemistry
Impact factor: 1.708, year: 2005

Hydrous iron (III) oxides agglomerated into uniform porous spherical clusters with submicrometre size and high specific surface area were obtained. Homogeneous precipitation of iron (III) sulphate was carried out in boiling aqueous solution that contained excess of urea. The prepared precursor precipitates were heated for 2 h at various temperature (from 200 to 800 ° C) to yield fine iron oxides powders. The structure evolution during heating of powders was investigated by X-ray diffraction (XRD). The morphology and microstructure characteristics were also obtained by means of scanning electron microscopy (SEM), (BET) and (BJH). In order to see the phase transition temperature thermogravimetric analysis/differential thermal analysis studies were performed. It was found that formation of different hydrous iron (III) oxides was affected by experimental conditions: aging time, mixing procedure, pH and temperature.

Příprava a charakteristika oxidů Fe3 připravených homogenizací síranu železitého močovinou.
Permanent Link: http://hdl.handle.net/11104/0116878