Synthesis and characterization of nanostructure hydrous iron-titanium binary mixed oxide for arsenic sorption

Synthesis of nanostructure hydrous iron-titanium binary mixed oxide (NHITBMO) had been reported by a simple method, and characterized by the X-ray diffraction (XRD), thermal analysis, transmission electron microscope (TEM), Föurier Transform Infrared (FTIR), surface area, and zero surface charge pH (pHzpc). The synthetic oxide was hydrated and microcrystalline with 77.8 m ² g^-1 BET surface area. The particle size (nm) calculated using XRD peak table and TEM image was ∼10-13 and 6-8, respectively. The pH_zpc value was 6.0 (±0.05) for the oxide. The NHITBMO showed pH dependent good sorption affinity for arsenic from the aqueous solution and, the Langmuir monolayer capacity (mg g^-1) was 80.0 and 14.6, respectively, for the As(III) and As(V). The pseudo-second order equation described the room temperature arsenic sorption kinetic data well. The minimum dose required was 1.6 g NHITBMO per L of water (As_total = 0.24 mg L^-1) to reduce the arsenic level below 0.01 mg L^-1 in batch treatment process.