Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (12): 2282-2286.doi: 10.3866/PKU.WHXB20081222

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Effect of Ferrihydrite Sub-microstructure on Its Reactivity

MA Miao-Rui, YANG Li-Juan, LIU Qian, LIU Hui, WEI Yu   

  1. College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050016, P. R. China; Key Laboratory of Inorganic Nanomaterial of Hebei Province, Shijiazhuang 050016, P. R. China
  • Received:2008-07-21 Revised:2008-09-13 Published:2008-12-04
  • Contact: LIU Hui; WEI Yu

Abstract: Ferrihydrite was prepared by three procedures using Fe(III) as a raw material and NaOH as a precipitant. X-ray diffraction (XRD), infrared (IR) spectroscopy, differential thermal analysis (DTA), and kinetic dissolution in an acidic medium were employed to characterize the ferrihydrite synthesized by different methods. The effect of ferrihydrite sub-microstructure on its reactivity was investigated. The results showed that the sub-microstructure and the reactivity of ferrihydrite were related to the different preparation procedures. The structure of ferrihydrite prepared by adding Fe(III) and NaOH solutions to water simultaneously and at a constant pH is so similar to the structure of hematite that it easily transforms into hematite particles.

Key words: Ferrihydrite, Sub-microstructure, Hematite, Reactivity


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