Sonochemical powder processing of iron hydroxides

Naoya Enomoto, Jun Ichi Akagi, Zenbe E. Nakagawa

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    50 Citations (Scopus)

    Abstract

    Iron (II) hydroxide was oxidized in an ultrasonic-activated solution to produce α-FeOOH (goethite) or Fe3O4 (magnetite). This process involves the dissolution of Fe(OH)2, the oxidation of Fe2+ to Fe3+, and the precipitation of the products. It was found that the ultrasonic treatment greatly fasten the appearance and the growth of the products if oxygen was sufficiently supplied. When the oxygen supply was insufficient, on the other hand, an obvious phenomenon of sonochemical switching due to the enhanced oxidation was observed; that is, ultrasound promoted the α-FeOOH formation and suppressed the formation of Fe3O4 which has lower oxidation number (Fe= +8/3) than α-FeOOH (Fe= +3).

    Original languageEnglish
    Pages (from-to)S97-S103
    JournalUltrasonics Sonochemistry
    Volume3
    Issue number2
    DOIs
    Publication statusPublished - 1996

    All Science Journal Classification (ASJC) codes

    • Chemical Engineering (miscellaneous)
    • Environmental Chemistry
    • Radiology Nuclear Medicine and imaging
    • Acoustics and Ultrasonics
    • Organic Chemistry
    • Inorganic Chemistry

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