NDLI: Synthesis of carbon-coated, porous and water-dispersive $Fe_{3}O_{4}$ nanocapsules and their excellent performance for heavy metal removal applications

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Zhou, Yu-mei Sun, Zhi-yuan Kong, Xiang-kai Zhong, Hao Hu, Hai-bo Chen, Qian-wang Cheng, Kai
Description	Author Affiliation: Cheng K ( Hefei National Laboratory for Physical Sciences at Microscale and Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.)
Abstract	Porous $Fe_{3}O_{4}@C$ nanocapsules with a diameter of about 120 nm (about 50 nm cavity) were synthesized by combining a sacrificial template method with solvothermal treatment . The $N_{2}$ adsorption–desorption isotherms reveals their mesoporous structure and large BET surface area (159.8 $m^{2}$ $g^{−1}).$ The magnetic investigation indicates their superparamagnetic nature and high saturation magnetization (55.93 emu $g^{−1}).$ The nanocapsules also exhibit negative zeta potential (−27.59 mV) and possess carboxyl groups on the outer carbon layer, which keeps them highly dispersive in aqueous solution and provides a chelating function for metal ions. The heavy metals removal test demonstrates the excellent affinity of nanocapsules, the high efficiency for different metals (>90%), 79 mg $g^{−1}$ adsorption capacity for $Pb^{2+}$ and ultrafast removal process $(Pb^{2+},$ 99.57% within 1 minute). Protected by a porous carbon layer, the nanocapsules display excellent acidic resistance and adsorption properties even in an acidic solution (pH = 3). Moreover, the metal ions can be easily adsorbed and desorbed through manipulating the pH value for adsorbent regeneration and heavy metal recycling.
ISSN	14779226
Issue Number	19
Journal	Dalton Trans.
Volume Number	41
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2012-05-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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