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Indexed by:期刊论文

Date of Publication:2013-11-25

Journal:SMALL

Included Journals:SCIE、EI、PubMed、Scopus

Volume:9

Issue:22

Page Number:3852-3857

ISSN No.:1613-6810

Key Words:carbon,chromium,core/shell materials,magnetic materials,microporous carbon,microporous materials

Abstract: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.