Abstract
The phase transformation from Fe(OH) 3 gel to α-Fe 2O 3 particles at different initial pHs at about 100 °C was studied. The time necessary for completing the above process was determined. The results showed that the time of phase transformation from Fe(OH) 3 gel to α-Fe 2O 3 particles shortened with the increase of initial pH at pH < 4.5. In this pH range, β-FeOOH, as an intermediate product, was obtained and hematite was formed by dissolution/reprecipitation mechanism. However, in the pH range from 4.5 to 9.0, the transformation time prolonged with increasing pH. In this pH range, no intermediate product was found. From Fe(OH) 3 gel to hematite, there are two transformation pathways. One is the dissolution/reprecipitation mechanism and the other is the solid state transformation mechanism. With the pH close to the point of zero charge (pzc) of Fe(OH) 3 gel, the later mechanism gradually predominated.
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