Hydrothermal synthesis of β-FeOOH with different morphologies using NaH₂PO₄ as structural modifier

Abstract

Different morphologies of β-FeOOH were prepared by hydrothermal synthesis using NaH₂PO₄ as structural modifier. The rod-shaped, straw-like and flower-like products could be controllably obtained. The as-obtained products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Ultraviolet-visible (UV-Vis) absorption spectroscopy. The experimental results show that the morphology manipulation could be achieved by adding different amounts of NaH₂PO₄. XRD pattern indicates that the asprepared sample is the pure tetragonal phase of β-FeOOH. UV-Vis absorption spectra of the products are affected by their morphologies, which shows that both the rod-shaped and straw-like β-FeOOH have outstanding absorption ability on the whole UV area (200–400 nm), which will have vast application prospects in UV protection.

Keywords

β-FeOOH / hydrothermal / NaH₂PO₄ / UV absorption

References

[1] Bailey J.K., Brinker C.J., Mecartney M.L. Growth Mechanisms of Iron Oxide Particles of Differing Morphologies from the Forced Hydrolysis of Ferric Chloride Solutions[J]. J. Colloid Interface Sci., 1993, 1: 1-13.

[2] Wang D.B., Song C.X., Zhao Y.H., . Synthesis and Characterization of Monodisperse Iron Oxides Microspheres[J]. J. Phys. Chem. C, 2008, 33: 12 710-12 715.

[3] Sugimoto T., Sakata K., Muramatsu A. Formation Mechanism of Monodisperse Pseudocubic α-Fe2O3 Particles from Condensed Ferric Hydroxide Gel[J]. J. Colloid Interface Sci., 1993, 2: 372-382.

[4] Leygraf C., Graedel T. Atmospheric Corrosion [M], 2000 New York Wiley-Interscience 157

[5] Clarke N.S., Hall P.G. Adsorption of Water Vapor by Iron Oxides. 1. Preparation and Characterization of the Adsorbents [J]. Langmuir, 1991, 4: 672-677.

[6] Sugimoto T., Muramatsu A. Formation Mechanism of Monodispersed α-Fe₂O₃ Particles in Dilute FeCl₃ Solutions[J]. J. Colloid Interface Sci., 1996, 2: 626-638.

[7] Mazeina L., Deore S., Navrotsky A. Energetics of Bulk and Nano-Akaganeite, β-FeOOH: Enthalpy of Formation, Surface Enthalpy, and Enthalpy of Water Adsorption [J]. Chem. Mater., 2006, 7: 1 830-1 837.

[8] Watson J.H.L., Cardell R.R., Heller W. The Internal Structure of Colloidal Crystals of β-FeOOH and Remarks on their Assemblies in Schiller Layers [J]. J. Phys Chem., 1962, 10: 1 757-1 763.

[9] Musić S., Nagy-Czakó I., Vértes A. Mössbauer Study of the Microcrystals formed by Slow Hydrolysis of FeCl3 Solutions[J]. Colloid Polym Sci., 1980, 4: 469-470.

[10] Matijević E., Scheiner P. Ferric Hydrous Oxide Sols: III. Preparation of Uniform Particles by Hydrolysis of Fe(III)-chloride, -nitrate, and -perchlorate Solutions [J]. J. Colloid Interface Sci., 1978, 3: 509-524.

[11] Riveros P.A., Dutrizac J.E. The Precipitation of Hematite from Ferric Chloride Media [J]. Hydrometallurg, 1997, 1–2: 85-104.

[12] Elizalde S.G., Garcıa-Clavel M.E. Thermal Behaviour in Air of Iron Oxyhydroxides obtained from the Method of Homogeneous Precipitation: Part II. Akaganeite Sample [J]. Thermochim. Acta, 1988, 2: 325-334.

[13] Gotic M., Popovic S., Ljubesic N., . Structural Properties of Precipitates formed by Hydrolysis of Fe₃₊ ions in Aqueous Solutions containing NO₃₋ and Cl⁻ Ions[J]. J. Mater. Sci., 1994, 9: 2 474-2 480.

[14] Cai J., Liu J., Gao Z., . Synthesis and Anion Exchange of Tunnel Structure Akaganeite [J]. Chem. Mater., 2001, 12: 4 595-4 602.

[15] Music S., Krehula S., Popovic S. Effect of HCl Additions on Forced Hydrolysis of FeCl3 Solutions [J]. Mater. Lett., 2004, 21: 2 640-2 645.

[16] Hu Y.H., Chen K.Z. Crystal Splitting in the Growth of β-FeO(OH) [J]. J. Crystal Growth, 2007, 1: 185-188.

[17] Nitin K.C., Yu J.S. Size Control Synthesis of Uniform β-FeOOH to High Coercive Field Porous Magnetic α-Fe₂O₃ Nanorods [J]. J. Phys. Chem. C, 2008, 50: 19 957-19 962.

[18] Kratohvil S., Matijević E., Ozaki M. Precipitation Phenomena in FeCl₃-NaH₂PO₂ Aqueous Solutions at 245 °C[J]. Colloid. Polym. Sci., 1984, 10: 804-810.

[19] Galvez N., Barron V., Torrent J. Preparation and Properties of Hematite with Structural Phosphorus [J]. Clay Miner, 1999, 3: 375-385.

[20] Mark Z., Mira R., Music S. Effect of Phosphate on the Morphology and Size of α-Fe₂O₃ Particles Crystallized from dense β-FeOOH Suspensions [J]. J. Alloys Compounds, 2008, 1–2: 498-506.