Control of arsenic adsorption and arsenic desorption properties of novel porous iron particles for application to arsenic recovery process

以水合亚砷铁矿和水合磷酸铁颗粒（铁长石、强长石、亚铁长石）为原料合成磁铁矿多孔颗粒。这些颗粒是砷吸附剂的候选物，因为它们具有较大的比表面积和优越的过滤性能。研究了不同溶液条件下对砷的吸附和解吸性能。吸附量随ph的减小而增大，吸附在多孔颗粒上的砷在碱性溶液中被解吸。此外，金属铁板的浸没加速了砷的解吸。这种现象是由于溶液中电势的减小所致。

The porous particles of maghemite are synthesized from hydrated iron arsenite and hydrated iron phosphate particles such as scorodite, strengite and metastrengite. Such particles are candidates of arsenic adsorbents, because these exhibit large specific surface and superior filterability. In this study, arsenic adsorption and arsenic desorption properties were investigated under different solution conditions. The arsenic adsorption capacity was increased with decreasing pH. The arsenic adsorbed on porous particles was desorbed by the immersion in an alkaline solution. In addition, the arsenic desorption was accelerated by the immersion of a metallic iron plate. Such behavior is attributable to the decrease of electrical potential in the solution.