| abstract |
[Problem] To provide a means for reducing As ion concentrations in water to ultratrace amounts. [Solution] Ammonium molybdate is loaded on nanostructures of mesoporous alumina, etc. by mixing the nanostructures, obtained after treating the nanostructures with surfactant, in an aqueous solution containing ammonium molybdate. Nanostructures loaded with an arsenic ion-adsorbing compound such as ammonium molybdate can selectively adsorb and remove trace amounts of arsenic ions in water with room temperature treatment without water quality adjustments such as pH adjustment. Because no special pre-treatment is performed, extra after-treatments also are not necessary and because heating devices, etc. also are not used, a low cost arsenic removal system can be constructed. Configuring the arsenic treatment device in multiple steps allows arsenic ion-free aqueous solutions to be obtained rapidly and in large volumes. |