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Influence of Urotropin on the Precipitation of Iron Oxides from FeCl3 Solutions

Ankica Šarić ; Ruđer Bošković Institute, P. O. Box 1016, 10001 Zagreb, Croatia
Svetozar Musić ; Ruđer Bošković Institute, P. O. Box 1016, 10001 Zagreb, Croatia
Kiyoshi Nomura ; School of Engineering, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113 Japan
Stanko Popović ; Department of Physics, Faculty of Science, University of Zagreb, P. O. Box 162, 10001 Zagreb, Croatia

Puni tekst: engleski, pdf (245 KB) str. 1019-1038 preuzimanja: 265* citiraj
APA 6th Edition
Šarić, A., Musić, S., Nomura, K. i Popović, S. (1998). Influence of Urotropin on the Precipitation of Iron Oxides from FeCl3 Solutions. Croatica Chemica Acta, 71 (4), 1019-1038. Preuzeto s https://hrcak.srce.hr/132435
MLA 8th Edition
Šarić, Ankica, et al. "Influence of Urotropin on the Precipitation of Iron Oxides from FeCl3 Solutions." Croatica Chemica Acta, vol. 71, br. 4, 1998, str. 1019-1038. https://hrcak.srce.hr/132435. Citirano 29.10.2020.
Chicago 17th Edition
Šarić, Ankica, Svetozar Musić, Kiyoshi Nomura i Stanko Popović. "Influence of Urotropin on the Precipitation of Iron Oxides from FeCl3 Solutions." Croatica Chemica Acta 71, br. 4 (1998): 1019-1038. https://hrcak.srce.hr/132435
Harvard
Šarić, A., et al. (1998). 'Influence of Urotropin on the Precipitation of Iron Oxides from FeCl3 Solutions', Croatica Chemica Acta, 71(4), str. 1019-1038. Preuzeto s: https://hrcak.srce.hr/132435 (Datum pristupa: 29.10.2020.)
Vancouver
Šarić A, Musić S, Nomura K, Popović S. Influence of Urotropin on the Precipitation of Iron Oxides from FeCl3 Solutions. Croatica Chemica Acta [Internet]. 1998 [pristupljeno 29.10.2020.];71(4):1019-1038. Dostupno na: https://hrcak.srce.hr/132435
IEEE
A. Šarić, S. Musić, K. Nomura i S. Popović, "Influence of Urotropin on the Precipitation of Iron Oxides from FeCl3 Solutions", Croatica Chemica Acta, vol.71, br. 4, str. 1019-1038, 1998. [Online]. Dostupno na: https://hrcak.srce.hr/132435. [Citirano: 29.10.2020.]

Sažetak
Precipitations of iron oxides from FeCl3 solutions in the presence of urotropin at 90 °C were monitored using the Fourier transform infrared spectroscopy, Mössbauer spectroscopy, X-ray diffraction and transmission electron microscopy. Urotropin was used as a generator of OH- ions. The precipitation processes depended on the concentrations of FeCl3 and urotropin and the time of aging. After 1 day of aging the precipitation systems up to pH ≈ 2, the β-FeOOH phase was precipitated, while in the region of 5 < pH < 6 the mixtures of β-FeOOH, α-Fe2O3 and α-FeOOH were precipitated, and at pH > 6 the mixtures of α-Fe2O3 and α-FeOOH were observed. The β-FeOOH phase precipitated at 2.16 < pH < 5.55 dissolved after 7 days, yielding soluble iron for the α-FeOOH growth on account of α-Fe2O3. At pH ≈ 1.5 and less, β-FeOOH was present as a single phase up to 7 days of aging the precipitation systems. The mechanisms of iron oxide precipitation in dependence on pH were discussed. The size and morphology of oxide particles were strongly influenced by experimental conditions of the precipitation process as shown by transmission electron microscopy.

Hrčak ID: 132435

URI
https://hrcak.srce.hr/132435

Posjeta: 379 *