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Sea-urchin-like iron oxide nanostructures for water treatment
Lee, H.U.,Lee, S.C.,Lee, Y.C.,Vrtnik, S.,Kim, C.,Lee, S.,Lee, Y.B.,Nam, B.,Lee, J.W.,Park, S.Y.,Lee, S.M.,Lee, J. Elsevier Scientific Pub. Co 2013 Journal of hazardous materials Vol.262 No.-
To obtain adsorbents with high capacities for removing heavy metals and organic pollutants capable of quick magnetic separation, we fabricated unique sea-urchin-like magnetic iron oxide (mixed γ-Fe<SUB>2</SUB>O<SUB>3</SUB>/Fe<SUB>3</SUB>O<SUB>4</SUB> phase) nanostructures (called u-MFN) with large surface areas (94.1m<SUP>2</SUP>g<SUP>-1</SUP>) and strong magnetic properties (57.9emug<SUP>-1</SUP>) using a simple growth process and investigated their potential applications in water treatment. The u-MFN had excellent removal capabilities for the heavy metals As(V) (39.6mgg<SUP>-1</SUP>) and Cr(VI) (35.0mgg<SUP>-1</SUP>) and the organic pollutant Congo red (109.2mgg<SUP>-1</SUP>). The u-MFN also displays excellent adsorption of Congo red after recycling. Because of its high adsorption capacity, fast adsorption rate, and quick magnetic separation from treated water, the u-MFN developed in the present study is expected to be an efficient magnetic adsorbent for heavy metals and organic pollutants in aqueous solutions.