Thermoanalytical Study of β-FeOOH Obtained by Homogeneous Precipitation with Urea
Akaganéite specimens were obtained from Fe(III) hydrochloric solutions by the technique “precipitation from homogeneous solution”, using urea as the hydrolytic reagent.
It has been studied the influence of different precipitation conditions: concentration of the iron solution, concentration of urea, temperature and time of heating.We have established the optima conditions of akaganéite obtention: [Fe(III)]=3.7×10-2M; [(NH2)2CO]=0.74M; boiling point temperature; time of heating, 30–45 minutes.If it is employed a longer time of hea ting, the akaganéite changes to hematite.
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