P18 超音波を用いた球形燐酸鉄の合成およびその砒素吸着特性(ポスターセッション)

抄録

Arsenic in Acid mine drainage (AMD) is treated by coprecipitation method using a coexisting ion (Fe). Precipitate is generated at coprecipitation method by neutralization of the solution. The precipitate, sludge, containing arsenic is stored in the sludge storage dam. Therefore, decreasing the amount of sludge is a necessity. We consider that arsenic removal before the neutralization makes iron-based precipitate which can be used as an iron resource. Thus, we are investigating the adsorbent of arsenic which works in strong-acidic solution. Previous study on goethite showed effective performance at acidic region. The particle size of goethite is very fine. And it makes solid-liquid separation after adsorption of arsenic difficult. Recently, the porous iron oxide is promising because it has high adsorption capacity of arsenic and the particle size is larger than that of goethite. Porous iron oxide is synthesized from scorodite or iron phosphate using alkaline solution. The size and morphology of porous iron oxide maintains that of the origin materials after the treatment of alkaline solution. Thus in this study, synthesis of iron phosphate with large size is attempted using ultrasound effects. The synthesized iron phosphate had a diameter of about 1 μm and the morphology was spherical. Porous iron oxide was successfully synthesized from synthesized iron phosphate using alkali solution and the size and momhologv were maintained (about 1 μm and spherical).