The Precipitates from Aqueous Mixed Solution of FeCl<SUB>3</SUB> and Fe<SUB>2</SUB>(SO<SUB>4</SUB>)<SUB>3</SUB> by Hydrolysis

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  • INOUYE Katsuya
    Department of Chemistry, Faculty of Science, Chiba University
  • OZAWA Yoichi
    Department of Chemistry, Faculty of Science, Chiba University
  • KANEKO Katsumi
    Department of Chemistry, Faculty of Science, Chiba University
  • OZEKI Sumio
    Department of Chemistry, Faculty of Science, Chiba University

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Other Title
  • 塩化鉄(III)-硫酸鉄(III)混合水溶液の加水分解と生成物の変化
  • The precipitates from aqueous mixed solution of FeCl3 and Fe2(SO4)3 by hydrolysis.

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Description

The aqueous mixed solution of FeCl3 and Fe2(SO4)3 has been hydrolyzed at various pH (1.6, 7, and 13), temperatures (30, 50, and 100°C), and mol% of FeCl3/(FeCl3+Fe2(SO4)3)(abbr. M. F. ) (0-100%). The precipitates were examined by X-ra y diffraction, electron microscope, DTA, measurements of specific surface area, and chemical analysis. From acidic solution, jarosite, β-FeO(OH), and their mixture were obtained at 100°C under the ce rtain composition of solution (Fig.1). The crystal form of jarosite in the mixture obtained from the mixed solution of 60-75% in M. F. is thinner than that from the mixed solution containing FeCl3 less than 55% in M. F. (Fig.3). The addition of small amount of Fe2(SO4)3to aqueous FeCl3 solution (95-85% in M. F. ) made β-FeO(OH) crystals needle sh ape from spindle shape (Fig.3) and reduced content of Cl- from c. a.15% to 5% in Cl-/Fe3+ m olar ratio (Table 1). The reduction of Cl--content in β-FeO(OH) crystals led to higher shift of decomposition temperature of β-FeO(OH). The β-FeO(OH) crystals of needle shape was smaller in crystallite size and larger in specific surface area than the β-FeO(OH) crystals of spindle shape. The precipitates from neutral and basic solutions were amorphous hydrous iron oxide and α-FeO(OH), respectively, regardless of the composition of the solutio n and temperature. The effect of coexistence of and SO42- on the hydrolysis of Fe3+ was discussed.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1986 (10), 1281-1286, 1986-10-10

    The Chemical Society of Japan

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