2000 Volume 49 Issue 2 Pages 78-81
Iron oxyhydroxides were prepared by oxidation and hydrolysis of Fe2+ containing solutions. The types of product were different for different solution pH : α- and γ-FeOOH at pH=6.0-7.0 ; γ-FeOOH at pH=7.0-8.0 ; γ- and δ'-FeOOH at pH=8.0-9.2 ; and δ'-FeOOH at pH=9.2-9.5. Preparation of iron oxyhydroxides from solutions with Cu2+, Ni2+ and PO43- were also carried out at pH=7.5. It was found that the ion addition increased the specific surface area and decreased the crystallite size of γ-FeOOH. Adding Cu2+ formed α- and γ-FeOOH while γ-Fe2O3 was formed by Ni2+ and PO43- addition.