Arsenic Removal from Dilute Solutions by High Surface Area Mesoporous Iron Oxyhydroxide |
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Authors: | Dilshad Masih Yoshimi Seida Yasuo Izumi |
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Institution: | 1. Global Edge Institute, Tokyo Institute of Technology, 4259-G1-33 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan 2. Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, 4259-G1-33 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan 3. Graduate School of Science, Chiba University, Yayoi 1-33, Inage-ku, Chiba, 263-8522, Japan
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Abstract: | 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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