Pregled bibliografske jedinice broj: 296270
Influence of copper ions on the precipitation of goethite and hematite in highly alkaline media
Influence of copper ions on the precipitation of goethite and hematite in highly alkaline media // Journal of molecular structure, 834-836 (2007), 154-161 doi:10.1016/j.molstruc.2006.10.032 (međunarodna recenzija, članak, znanstveni)
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Naslov
Influence of copper ions on the precipitation of goethite and hematite in highly alkaline media
Autori
Krehula, Stjepko ; Musić, Svetozar
Izvornik
Journal of molecular structure (0022-2860) 834-836
(2007);
154-161
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
alpha-FeOOH ; alpha-Fe2O3 ; 57Fe Mossbauer ; FT-IR ; FE SEM
Sažetak
The effects of Cu-dopant on the precipitation of alpha-FeOOH and alpha-Fe2O3 particles in highly alkaline media were investigated using 57Fe Mossbauer and Fourier transform infrared (FT-IR) spectroscopies and thermal field emission scanning electron microscopy (FE SEM). Only alpha-(Fe, Cu)OOH solid solutions were obtained between r = 0.0099 and 0.0291, where r = [Cu]/([Cu] + [Fe]). A mixture of alpha-(Fe, Cu)OOH and alpha-(Fe, Cu)2O3 solid solutions was obtained between r = 0.0385 and 0.0566, whereas only an alpha-(Fe, Cu)2O3 solid solution was obtained between r = 0.0698 and 0.1666. Cu-substitutions in alpha-(Fe, Cu)OOH and alpha-(Fe, Cu)2O3 decreased the hyperfine magnetic field values. With increased Cu-substitution in an alpha-FeOOH type structure the IR shifts were observed. With an increased r value of initial solution a gradual elongation of alpha-(Fe, Cu)OOH particles along the crystallographic c-axis was observed. At r = 0.0476, some alpha- (Fe, Cu)OOH particles were 700 nm long, and correspondingly the width and thickness of these particles decreased markedly. With a further increase in r the length of alpha-(Fe, Cu)OOH particles decreased. alpha-(Fe, Cu)2O3 particles showed varying sizes in dependence on the precipitation conditions, whereas their geometrical shapes matched those typical of alpha-Fe2O3.
Izvorni jezik
Engleski
Znanstvena područja
Kemija
Napomena
Rad je kao poster prezentiran na skupu XXVIII European Congress on Molecular Spectroscopy, održanom od 3.-8.9.2006., Istanbul, Turska, objavljen u Knjizi sažetaka, 2006. ; Sevim Akyüz, Elif Akalın (ur.) ; str. 79-79. A Collection of Papers Presented at the XXVIIIth European Congress on Molecular Spectroscopy : Molecular spectroscopy and molecular structure 2006.
POVEZANOST RADA
Projekti:
098-0982904-2952 - Sinteza i mikrostruktura metalnih oksida i oksidnih stakala (Ristić, Mira, MZOS ) ( CroRIS)
Ustanove:
Institut "Ruđer Bošković", Zagreb
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus
