Formation of Ferrihydrite by Inhibition of Green Rust Structures in the Presence of Silicon1
- Zahurul Karim2
The initial phase formed during neutralization and partial oxidation of ferrous chloride solutions, with XRD reflections at 0.258 and 0.155 nm, is a close-packed oxygen/hydroxyl sheet. The presence or absence of Si determines, apparently, what happens to the initial phase as oxidation proceeds. In the absence of Si, the initial phase further reacts to form green rust, presumably a double hydroxide of ferrous and ferric Fe which ultimately forms lepidocrocite. In the presence of Si, the formation of green rust structure from the initial phase is inhibited, as evidenced by symmetrical basal and asymmetrical hk x-ray diffraction (XRD) lines, and ferrihydrite is the ultimate oxidation product.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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