Arsenic Removal from Dilute Solutions by High Surface Area Mesoporous Iron Oxyhydroxide
2009
Masih, Dilshad | Seida, Yoshimi | Izumi, Yasuo
Mesostructured iron oxyhydroxide (FeO x ) and iron oxyhydroxide-phosphate (FeO x P) composites were organized using dodecylsulfate surfactant as a template. X-ray diffraction studies depicted a lamellar structure of the product. Ion exchange and solvent extraction methods were employed for the removal of the surfactant. Carboxylate ions exchanged lamellar type mesostructured material reorganized to a wormhole-like mesoporous material when heated under N₂ atmosphere. Surfactant was completely removed by carboxylate ions as observed by the Fourier transform infrared spectra. High surface area acetate-exchanged FeO x (230 m² g⁻¹) was obtained after the surfactant removal from the composite (2.8 m² g⁻¹). Surface area of acetate-exchanged FeO x P was the highest (240 m²g⁻¹) after the removal of the surfactant. Local structure of iron species of FeO x was investigated by X-ray absorption fine structure spectroscopy. Further, Fe···Fe bond appeared at 3.21-3.25 Å with coordination number 2-3, showing a high degree of un-saturation of Fe···Fe bonds. As compared with bulk iron oxyhydroxide and iron-intercalated montmorillonite, the mesoporous iron materials were highly effective for arsenic removal from low concentrations of aqueous solutions. Furthermore, mesoporous iron materials were stable in aqueous phase.
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