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The effect of operating conditions on iron oxides production–kinetics mechanism and final products characteristics

Iron oxides are considered a very interesting class of materials due to their morphological characteristics, especially in the adsorption and catalysis fields. As an adsorbent, iron oxide is used both in water and industrial wastewater treatment. In this paper, iron oxide samples were obtained in goethite and magnetite phases by acid method starting from the intermediate green rust II (GRII). For that, the molar [FeSO4]/[NaOH] ratio was determined at R = 1.00. The influence of the oxygen flow rate introduced into the reaction mixture, the reaction temperature, stirring speed during mixing, and reaction time on the quality of the iron oxides produced were evaluated. It was possible to propose and validate a kinetic mechanism for iron oxide production based on the particle size/reaction time dependence. In addition, a limiting step for the reaction rate was also proposed.