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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Self-Template Etching Synthesis of Urchin-Like Fe 3 O 4 Microspheres for Enhanced Heavy Metal Ions Removal.
Langmuir : the ACS Journal of Surfaces and Colloids 2018 August 15
Hierachical Fe3 O4 microspheres with superparamagnetic properties are attractive for their superior structural, water-dispersible, and magnetic separation merits. Here self-template etching route was developed to create optimal porous structure in superparamagnetic Fe3 O4 microspheres by using the oxalic acid (H2 C2 O4 ) as etching agent. A plausible formation mechanism of the urchin-like Fe3 O4 microspheres was proposed based on systematic investigation of the etching process, which involved two stages including pore-forming step based on size-selective etching and pore-expanding step based on further etching. The as-synthesized Fe3 O4 microspheres exhibited urchin-like structure with specific surface area and pore-size tunable, water-dispersible, and superparamagnetic properties. The optimal urchin-like Fe3 O4 microspheres demonstrated superior performance including fast magnetic separation and high removal capabilities for the heavy metals ions like Pb2+ (112.8 mg g-1 ) and Cr(VI) (68.7 mg g-1 ). This work will shed new light on the synthesis of urchin-like microspheres for superior performance.
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