title: Switchable transport strategy to deposit active Fe/Fe3C cores into hollow microporous carbons for efficient chromium removal.
abstract: Magnetic hollow structures with microporous shell and highly dispersed active cores (Fe/Fe3 C 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/Fe3 C nanoparticles in the interior cavity. These engineered functional materials show high loading (≈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/Fe3 C 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/Fe3 C nanoparticles from corrosion and subsequent leaching problems.
authors.affiliation: State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Faculty of Chemical, Environmental, and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China.
authors.forename: Dong-Hai
authors.initials: DH
authors.lastname: Liu
authors.forename: Yue
authors.initials: Y
authors.lastname: Guo
authors.forename: Lu-Hua
authors.initials: LH
authors.lastname: Zhang
authors.forename: Wen-Cui
authors.initials: WC
authors.lastname: Li
authors.forename: Tao
authors.initials: T
authors.lastname: Sun
authors.forename: An-Hui
authors.initials: AH
authors.lastname: Lu
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008280:Magnetics; D018508:Water Purification / Q000379:methods
chemical_list: D002857:Chromium; D002244:Carbon; D007501:Iron
keywords: carbon; chromium; core/shell materials; magnetic materials; microporous carbon; microporous materials