Low Temperature Processing of Iron Oxide Nanoflakes from Red Mud Extract toward Favorable De-arsenification of Water.

Iron oxide (α-FeO) was synthesized from red mud extract followed by hydrothermal reaction at 150 °C/6-24 h in the presence of NHOH. The crystallinity of α-FeO increased with reaction time as confirmed by X-ray Diffraction, while Fourier transform infrared spectroscopy and Raman illustrate the symmetric stretching vibration of the Fe-O bond in α-FeO. The X-ray photoelectron spectroscopic analysis shows O 1s spectra at 530.