3.1.3. Fe2O3

Iron (III) oxide was prepared adding drop by drop 50 mL of a 1.2 M NaOH aqueous solution to the same volume of a 0.4 M FeCl3 aqueous solution, under stirring. The so prepared suspension contains mixed oxide-hydroxide iron particles, which were separated by centrifugation (6000 rpm, 15 min), washed with deionized water and dried at 80 ◦C overnight. It was then grinded in a ceramic mortar and heated in air at 450 ◦C for 1 h, for complete conversion into iron(III) oxide, Fe2O3.
