P32 超音波照射を用いて合成したスコロダイト粒子の粒径およびその形態(ポスターセッション)

概要

論文の詳細を見る
Recently, scorodite has been studied as a promising storage material of arsenic. Scorodite is synthesized using a solution method using arsenic (As(V)) acidic solution and iron (Fe(II)) acidic solution. Large scorodite particles (>10μm) are synthesized at high temperature (>90℃ solution) in general. Particle size of scorodite can vary but larger ones are preferred because low surface-to-volume ratio makes it difficult to dissolve into the acidic solution. The purpose of our study is to apply ultrasound irradiation for synthesizing large scorodite particles (>10μm). Fe(II)-As(V) solution (50ml) was adjusted to a Fe/As molar ratio of 1.5. As(V) concentration of the solution was 20g/L and pH value at 2.0. Before the sonication of the solution, oxygen gas (100ml/min) was flowed into the solution for 20min to purge air in the flask. The temperature of the irradiated solution was controlled at about 50-80℃ using a heating system. The solution was irradiated using 200kHz ultrasound for 1h. Form the SEM images, the particle size of ultrasound synthesis (>10μm) is larger than that of stirring synthesis (>5μm). Scorodite was successfully synthesized as large size particles using ultrasound irradiation.
2013-10-25