Journal
SMALL
Volume 9, Issue 22, Pages 3852-3857Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201300276
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Funding
- NSFC [21073026]
- National Natural Science Fund for Distinguished Young Scholars [21225312]
- Program for New Century Excellent Talents in University of China [NCET-09-0254]
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Magnetic hollow structures with microporous shell and highly dispersed active cores (Fe/Fe3C nanoparticles) are rationally designed and fabricated by solution-phase switchable transport of active iron species combined with a solid-state thermolysis technique, thus allowing selective encapsulation of functional Fe/Fe3C nanoparticles in the interior cavity. These engineered functional materials show high loading (approximate to 54 wt%) of Fe, excellent chromium removal capability (100 mg g(-1)), fast adsorption rate (8766 mL mg(-1) h(-1)), and easy magnetic separation property (63.25 emu g(-1)). During the adsorption process, the internal highly dispersed Fe/Fe3C nanoparticles supply a driving force for facilitating Cr-VI diffusion inward, thus improving the adsorption rate and the adsorption capacity. At the same time, the external microporous carbon shell can also efficiently trap guest Cr-VI ions and protect Fe/Fe3C nanoparticles from corrosion and subsequent leaching problems.
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