Naslov
Impact of cadmium and phosphate ions on the hematite nanorings formation

Autori
Dražić, Goran ; Štefanić, Goran ; Jurkin, Tanja ; Gotić, Marijan

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

Izvornik
The Twenty-Sixth Croatian-Slovenian Crystallographic Meeting : Book of Abstracts / - Zagreb : Hrvatska akademija znanosti i umjetnosti (HAZU) ; Hrvatska Kristalografska Zajednica, 2018, 41-41

Skup
26th Croatian-Slovenian Crystallographic Meeting (CSCM26)

Mjesto i datum
Poreč, Hrvatska, 13.06.2018. - 17.06.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
hematite ; nanorings ; cadmium ions ; phosphate ions

Sažetak
It has been suggested that the addition of divalent metal cations during the hydrothermal synthesis of hematite (alpha-Fe2O3) in the presence of phosphate ions has a strong impact on the hematite morphology, crystal growth and dissolution (Gotić et al., J. Mol. Struct. 993 (2011) 167). In this work, the same system was modified with divalent cadmium ions and the impacts of cadmium and phosphate ions on the hematite nanorings formation have been studied. It has been found that formed hematite and akaganeite (beta-FeOOH) precipitates did not contain any trace of cadmium impurities. On the contrary, the modification with divalent cadmium cations changes the (PO4)3-/Fe3+ molar ratio in the system. Upon the addition of cadmium ions the (PO4)3-/Fe3+ molar ratio changes from 0.036 in a pure system to 0.051 in the cadmium modified system. The relative increase of phosphate concentration at earlystage of precipitation induced the change of spindle to spherical morphology and formation of the poorly crystallised akaganeite-like phase. The appearance of akaganeite-like phase directly correlated with the delay in the crystallisation of hematite. Besides, the relative increase of phosphate concentration has the prevailing effect for the change of spindle to pseudosphere and nanotube to nanoring particle morphologies.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA