Open AccessTHE EFFECT OF SODIUM DODECYL SULPHATE ON THE FORCED HYDROLYSIS OF FeCl3 SOLUTIONS
Author(s) -
Mira Ristić,
Jasenka Štajdohar,
Ivana Opačak,
Svetozar Musić
Publication year - 2017
Publication title -
prilozi - makedonska akademija na naukite i umetnostite. oddelenie za prirodno-matematički i biotehnički nauki/prilozi - makedonska akdemija na naukite i umetnostite. oddelenie za prirodno-matematički i biotehnički nauki
Language(s) - English
Resource type - Journals
eISSN - 1857-9949
pISSN - 1857-9027
DOI - 10.20903/csnmbs.masa.2017.38.1.101
Subject(s) - dissolution , chemistry , hydrolysis , crystallite , aqueous solution , sodium dodecyl sulfate , crystallinity , recrystallization (geology) , precipitation , iron oxide , inorganic chemistry , adsorption , coprecipitation , nuclear chemistry , chromatography , crystallography , organic chemistry , paleontology , physics , meteorology , biology
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 ß-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.