Abstract
The synthesis of large scorodite particles (>10 µm) at low temperature (50–70 °C) with a short reaction time (3 h) using 200 kHz ultrasound irradiation was investigated. Large scorodite particles (>10 µm) were obtained using ultrasound irradiation at 70 °C. The growth of scorodite particles was confirmed by scanning electron microscopy (SEM). The precursor agglomerated at the early stage of the synthesis using ultrasound irradiation. Ultrasound irradiation was applied to agglomerate the precursor. Large scorodite particles were synthesized without fine particles using ultrasound irradiation for a short time at the early stage of the synthesis followed by oxidation using stirring and oxygen flow without ultrasound irradiation.
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