Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 35, Pages 10300-10305Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta11938f
Keywords
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Funding
- Key Project of Knowledge Innovation Engineering of the Chinese Academy of Sciences [KZCX2-EW-410-02]
- National Nature Science Foundation of China [21007075, 21021003]
- National Basic Research Program of China (973 program) [2009CB930101]
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We report the template-free fabrication of 3D iron hydroxide hierarchical nanostructures through a simple and low-cost self-assembly process using a galvanic-cell reaction at room temperature. The existence of sodium sulfate in the reaction system is critical for formation of the iron hydroxide hierarchical nanostructures. X-ray diffraction analysis reveals that, after calcination, the iron hydroxide nanostructures can be changed into magnetic iron oxides. Relevant scanning electron microscopy and transmission electron microscopy images show that both of the flower-like nanostructures are composed of porous nanosheets. We also demonstrate that the two hierarchical nanostructures described above are negatively charged when dispersed in water. When used as adsorbents, they can selectively remove neutral dyes from wastewater with much higher capacities than those of conventional alpha-FeOOH and alpha-Fe2O3 nanoparticles, indicating great potential for use in water treatment.
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