Naslov
The Precipitation of α-Fe2O3 Particles by Forced Hydrolysis of FeCl3 Solutions in the Presence of Sodium Dodecyl Sulphate

Autori
Ristić, Mira ; Štajdohar, Jasenka ; Opačak, Ivana ; Musić, Svetozar

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

Izvornik
MECAME 2016 2nd Mediterranean Conference on the Applications of the Mössbauer Effect : book of abstracts / - , 2016, 52-52

Skup
MECAME 2016 2nd Mediterranean Conference on the Applications of the Mössbauer Effect

Mjesto i datum
Cavtat, Hrvatska, 31.05.2016. - 03.06.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
α-Fe2O3 Particles ; Sodium Dodecyl Sulphate ; Forced Hydrolysis ; Mössbauer spectroscopy

Sažetak
Hematite (α-Fe2O3) is the most stable iron oxide under ambient conditions. It has been widely investigated due to its potential for different applications in traditional and advanced technologies. For example, hematite particles can be used as pigments, adsorbents, fine abrasives, magnetic materials or sensors. Owing to their excellent semiconducting properties hematite particles have also found a potential for applications in photocatalysis for green energy production and environmental protection. The α- Fe2O3 particles can be synthesised by various experimental techniques, such as forced hydrolysis iron(III)-salt solution, sol-gel, hydrothermal/ solvothermal, thermal decomposition of iron- organic salts, etc. The properties of α-Fe2O3 particles are strongly influenced by their nano/microstructure. α-Fe2O3 particles of different nano/microstructure have been reported. In the present work the effect of sodium dodecyl sulphate (SDS) on the precipitation kinetics and morphology of α-Fe2O3 particles formed by forced hydrolysis of FeCl3 solutions was monitored. A direct phase transformation β-FeOOH → α-Fe2O3 via dissolution/recrystallization mechanism occurred in the absence of SDS. On the other hand, the addition of SDS into the precipitation system slowed the crystallization kinetics of α-Fe2O3. An intermediate, α-FeOOH phase precipitated which with a prolonged time of forced hydrolysis also transformed to α-Fe2O3. Mössbauer spectroscopy showed that α-Fe2O3 particles precipitated in the presence of SDS possessed a lower degree of crystallinity, while FE SEM revealed that these particles are formed by aggregation of much smaller elongated primary α-Fe2O3 units. The preferential adsorption of dodecyl sulphate groups on nuclei and crystallites of FeOOH and α-Fe2O3 phase during the forced hydrolysis of FeCl3 solutions had a dominant role in the formation of elongated α-Fe2O3 particles.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA