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Monitoring of the Forced Hydrolysis of FeCl3 Solutions in the Presence of Sodium Dodecyl Sulphate

Ristić, Mira; Štajdohar, Jasenka; Mitar, Ivana; Musić, Svetozar (2018) Monitoring of the Forced Hydrolysis of FeCl3 Solutions in the Presence of Sodium Dodecyl Sulphate. Croatica chemica acta, 91 (3). pp. 403-410. ISSN 0011-1643

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Abstract

Precipitations by the forced hydrolysis of 0.2 M FeCl3 aqueous solutions between 2 and 72 hours in the presence of 1% sodium n-dodecyl sulphate (SDS) were investigated. In the absence of SDS a direct phase transformation b- FeOOH → a-Fe2O3 via dissolution/ recrystallization occurred in the precipitation system. In the presence of SDS small amounts (traces) of a-FeOOH as an intermediate phase precipitated, and with a prolonged time of forced hydrolysis a-FeOOH also transformed to a-Fe2O3 via the dissolution/recrystallization mechanism. On the basis of Mössbauer spectra it was concluded that in the presence of SDS the a-Fe2O3 phase exhibited a lower degree of crystallinity. During the precipitation process in the presence of SDS the competition between the stability of Fe(III)-dodecyl sulphate on one side and the formation of iron oxide phases on the other also played an important role. Thermal field emission scanning electron microscopy (FE SEM) revealed that the big a- Fe2O3 particles possessed a substructure. The elongation of primary a-Fe2O3 particles produced in the presence of SDS was noticed. This effect can be assigned to the preferential adsorption of sulphate groups on nuclei and crystallites of FeOOH and a-Fe2O3 phases during the forced hydrolysis of FeCl3 solutions.

Item Type: Article
Uncontrolled Keywords: FeCl3 hydrolysis ; sodium n-dodecyl sulphate ; a-Fe2O3 ; a-FeOOH ; XRD ; Mössbauer ; FT-IR ; FE SEM
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division of Materials Chemistry
Projects:
Project titleProject leaderProject codeProject type
Nastajanje i svojstva 1D a-Fe2O3 nanostruktura dopiranih odabranim metalnim ionima-1D-DopedFeOXMira RistićIP-2016-06-8254HRZZ
Depositing User: Sofija Konjević
Date Deposited: 14 Jan 2019 15:14
Last Modified: 14 Jan 2019 15:14
URI: http://fulir.irb.hr/id/eprint/4401
DOI: 10.5562/cca3412

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