The preparation of Fe-doped titania nanotubes and adsorption activity for arsenic removal

Fe-doped titania nanotubes were prepared by impregnation method to improve the adsorption properties of titania nanotubes. XRD and BET were used to characterize the crystalline phase and special surface area of titania nanotubes. The analysis results revealed that the crystalline phase of titania nanotubes was unchanged after doping the iron, and the characteristic peak of iron appeared when the concentration of impregnating solution is 3 mol/L. The special surface area of Fe-doped and bare titania nanotubes was 233.9 m²/g and 298.2 m²/g respectively, which indicated that the surface area decreased after doping the iron on titania nanotubes. The adsorption experiment of arsenic on Fe-doped titania nanotubes showed that the adsorption amount of As(V) on Fe-doped titania nanotubes reached 134.2 mg·g^-1 at 25°C, while the adsorption amount of As(V) on undoped titanium nanotubes was 92.2 mg/g. It can be concluded that Fe-doped titania nanotubes is a promising adsorbent for arsenic removal.