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Sonochemical powder processing of iron hydroxides

Enomoto, Naoya ; Akagi, Jun-ichi ; Nakagawa, Zenbe-e

Ultrasonics sonochemistry, 1996-07, Vol.3 (2), p.S97-S103 [Periódico revisado por pares]

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Título:
Sonochemical powder processing of iron hydroxides
Autor: Enomoto, Naoya ; Akagi, Jun-ichi ; Nakagawa, Zenbe-e
Assuntos: Chemistry ; Dissolution-precipitation ; Exact sciences and technology ; General and physical chemistry ; Oxidation ; Physical chemistry of induced reactions (with radiations, particles and ultrasonics) ; Sonochemical powder process ; Ultrasonic chemistry
É parte de: Ultrasonics sonochemistry, 1996-07, Vol.3 (2), p.S97-S103
Descrição: Iron(II) hydroxide was oxidized in an ultrasonic-activated solution to produce α-FeOOH (goethite) or Fe 3O 4 (magnetite). This process involves the dissolution of Fe(OH) 2, the oxidation of Fe 2+ to Fe 3+, 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 Fe 3O 4 which has lower oxidation number ( Fe = +8 3 ) then α-FeOOH (Fe = +3).
Editor: Amsterdam: Elsevier B.V
Idioma: Inglês

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