Formation and Morphology Evolution from Ferrihydrite to Hematite in the Presence of Tartaric Acid

摘要: Hematite, with ferrihydrite as the common precursor, is most stable iron oxide in soils and sediments has many applications environmental systems. As a reducing agent soils, tartaric acid (L-TA) can reduce Fe3+ to Fe2+ template formation of hematite from ferrihydrite. Here, presence L-TA was investigated under different concentrations, initial suspension pH, aging time. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high- resolution transmission (HRTEM). Both transformation process particle morphology affected pHi at which added suspension. Optimal values L-TA/Fe(III) molar ratio 1.0% an time 10 h 100 °C 7 11. At 7, optimal for completed after about 20 h. ...