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The effect of sodium dodecyl sulphate on the forced hydrolysis of FeCl3 solutions

Ristić, Mira; Štajdohar, Jasenka; Opačak, Ivana; Musić, Svetozar (2017) The effect of sodium dodecyl sulphate on the forced hydrolysis of FeCl3 solutions. Contributions, Section of Natural, Mathematical and Biotechnical Sciences, 38 (1). pp. 57-67. ISSN 1857-9027

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Precipitations by the forced hydrolysis of 0.2 M FeCl3 aqueous solutions between 2 and 72 hours in the presence of 1% sodium dodecyl sulphate (SDS) were investigated. In the absence of SDS a direct phase transformation α-FeOOH → α-Fe2O3 via dissolution/recrystallization occured in the precipitation system. In the presence of SDS, α-FeOOH as an intermediate phase precipitated and, with a prolonged time of forced hydrolysis, also transformed to α- Fe2O3 via the dissolution/recrystallization mechanism. On the basis of Mössbauer spectra it was concluded that in the presence of SDS, α-Fe2O3 phase possessed a lower degree of crystallinity. In this precipitation process 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. FE SEM revealed that the big α-Fe2O3 particles possessed the substructure. The elongation of primary α-Fe2O3 particles produced in the presence of SDS was noticed. This effect can be assigned to the preferential adsorption of dodecyl sulphate groups on nuclei and crystallites of FeOOH and α-Fe2O3 phase during the forced hydrolysis of FeCl3 solutions.

Item Type: Article
Uncontrolled Keywords: FeCl3 hydrolysis ; sodium dodecyl sulphate ; α-Fe2O3 ; Mössbauer ; FT-IR ; XRD ; FE SEM
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division of Materials Chemistry
Depositing User: Mira Ristić
Date Deposited: 04 Dec 2018 10:33
DOI: 10.20903/csnmbs.masa.2017.38.1.101

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