| Title | THE EFFECT OF SODIUM DODECYL SULPHATE ON THE FORCED HYDROLYSIS of FeCl3 SOLUTIONS |
| Author/s | Mira Ristić, Jasenka Štajdohar, Ivana Opačak, Svetozar Musić |
| Citation | M. Ristić, J. Štajdohar, I. Opačak, S. Musić "THE EFFECT OF SODIUM DODECYL SULPHATE ON THE FORCED HYDROLYSIS of FeCl3 SOLUTIONS", CONTRIBUTIONS, Section of Natural, Mathematical and Biotechnical Sciences, MASA, Vol. 38, No. 1, pp. 57-67 (2017) |
| Abstract | 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 ‑FeOOH → -Fe2O3 via dissolution/recrystallization occured in the precipitation system. In the presence of SDS, -FeOOH as an intermediate phase precipitated and, with a prolonged time of forced hydrolysis, also transformed to -Fe2O3 via the dissolution/recrystallization mechanism. On the basis of Mössbauer spectra it was concluded that in the presence of SDS, -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 -Fe2O3 particles possessed the substructure. The elongation of primary -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 -Fe2O3 phase during the forced hydrolysis of FeCl3 solutions. |
| Keywords | FeCl3 hydrolysis; sodium dodecyl sulphate; -Fe2O3; Mössbauer; FT-IR; XRD; FE SEM |
