Preparation: |
Goethite (GOE) was synthesized following the procedure described by Atkinson et al. (1967). 5 M NaOH was added dropwise to a 0.1 M Fe(NO3)3·9H2O solution with vigorous stirring, and N2 was bubbled through the solution to prevent contamination with carbon dioxide. The precipitate thus obtained was then aged for 72 h at 60 °C,
cooled at room temperature, dialyzed until the conductivity was below 10 μS/cm and freeze-dried to obtain a powder, which was then homogenized and stored. |