In this study, a three-dimensional ordered macroporous hematite was prepared using the polystyrene colloid crystal templates and characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, and nitrogen adsorption isotherm. The as-prepared hematite shows a porous structure consisting of the macropores about 200 nm in diameter and the walls about 20 nm in thickness. The adsorption of Pb<sup>2+</sup> and Cd<sup>2+</sup> ions in aqueous solution by this hematite was also evaluated. At room temperature, each gram hematite adsorbs 12.5 mg of Pb<sup>2+</sup> ions and 7.0 mg of Cd<sup>2+</sup> ions. The results suggest that the obtained hematite should be a promising adsorbent to remove Pb<sup>2+</sup> and Cd<sup>2+</sup> ions, and other heavy metal ions from aqueous solution.
KeywordsMacroporousHeavy Metal IonsAdsorptionPollution
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