Pregled bibliografske jedinice broj: 316357
Synthesis of nanocrystalline iron oxide particles in the iron(III)acetate/alcohol/acetic acid system
Synthesis of nanocrystalline iron oxide particles in the iron(III)acetate/alcohol/acetic acid system // European Journal of Inorganic Chemistry, 2008 (2008), 6; 966-973 doi:10.1002/ejic.200700986 (međunarodna recenzija, članak, znanstveni)
CROSBI ID: 316357 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Synthesis of nanocrystalline iron oxide particles in the iron(III)acetate/alcohol/acetic acid system
Autori
Gotić, Marijan ; Musić, Svetozar
Izvornik
European Journal of Inorganic Chemistry (1434-1948) 2008
(2008), 6;
966-973
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
acetate ; magnetite ; hematite ; esterification ; solvothermal
Sažetak
Nanosize iron oxide particles were synthesised without adding water by autoclaving iron(III) acetate/alcohol/ and iron(III) acetate/acetic acid/alcohol solutions at 180oC for different time periods. Magnetite was formed in iron(III) acetate/ethanol, while hematite was formed in the iron(III) acetate/acetic acid/ethanol system. The average crystallite size of 11.1 and 22.6 nm as determined by Rietveld analysis of XRD patterns and the stoichiometry of Fe2.89O4 (Mössbauer) were found for nanosize magnetite particles. FE-SEM showed that primary magnetite particles aggregated into regular spheres 5 to 10 mm in size, which can be explained by the specific character of the small, reactive and polar molecules of ethanol. In the system iron(III) acetate/octanol, a mixture of magnetite and hematite was obtained. The average crystallite size of magnetite was up to 22 nm and that of hematite up to 46.7 nm as determined by Rietveld analysis. In the iron(III) acetate/acetic acid/ethanol system nanosize hematite particles were exclusively formed. 13C NMR spectroscopy revealed the presence of ethyl acetate ester in supernatants. The formation of ester in the iron(III) acetate/ethanol system was explained by the catalytic oxidation of ethanol in the presence of acetate groups bonded to iron. Thus, in the oxidative dehydrogenation of ethanol into ethyl acetate, coordinated Fe3+ served as an electron acceptor that was reduced to Fe2+ , and exclusively magnetite was formed. With the addition of acetic acid to the iron(III) acetate/ethanol system, the free acetic acid that was not bound to iron, directly participated in an esterification reaction with ethanol. Water molecules generated in situ in this esterification reaction hydrolysed iron(III) acetate, and hematite was formed.
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
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