Naslov
The influence of CTAB and gum arabic on the precipitation of a-FeOOH in a highly alkaline medium

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

Izvornik
Journal of molecular structure (0022-2860) 1090 (2015); 129-137

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
αlfa-FeOOH; XRD; 57^Fe Mossbauer; FT-IR; FE-SEM

Sažetak
The influence of cetyltrimethylammonium bromide (CTAB) and gum arabic (GA) on the precipitation of α-FeOOH in a highly alkaline medium was investigated using XRD, 57Fe Mössbauer, FT-IR and FE-SEM. In absence of CTAB and GA long α-FeOOH rods of nanosize width were obtained. For predetermined concentrations of CTAB added to the precipitation system the formation of a small fraction of α-Fe2O3 was noticed, whereas the length of the α-FeOOH rods significantly decreased and α-FeOOH dendrites were also found. The effect was specifically pronounced when GA was added to the precipitation system. The formation of ferrihydrite-like phase was detected, which suppressed the crystal growth of α-FeOOH on one side and forced the nucleation and growth of α-Fe2O3 on the other. Microstructural changes in the precipitates were also monitored. The phase transformation and changes in the nano/microstructure of the precipitates found can be explained taking into account the surface interactions between CTAB or GA with nuclei and crystallites (particles) during the kinetics investigated.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

Napomena
Rad je prezentiran na skupu the XXXIInd European Congress on Molecular Spectroscopy, održanom od 24.-29.08.2014.g., Düsseldorf, Njemačka.

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