Abstract
The mechanism of formation of hematite particles in the Fe-HNO 3 system is investigated by introduction of a small amount of PO 4 3− ions to the system. The intermediate species in the reaction, 6-line ferrihydrite, is successfully obtained. The transformation of 6-line ferrihydrite to hematite is investigated. The results show that Fe(II) in the Fe-HNO 3 system can catalyze the dissolution of 6-line ferrihydrite, leading to the rapid formation of hematite.
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