Self-Template Etching Synthesis of Urchin-Like Fe3 O4 Microspheres for Enhanced Heavy Metal Ions Removal

Langmuir : the ACS Journal of Surfaces and Colloids
Yong YuBingfang Zou

Abstract

Hierachical Fe3O4 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 Fe3O4 microspheres by using the oxalic acid (H2C2O4) as etching agent. A plausible formation mechanism of the urchin-like Fe3O4 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 Fe3O4 microspheres exhibited urchin-like structure with specific surface area and pore-size tunable, water-dispersible, and superparamagnetic properties. The optimal urchin-like Fe3O4 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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Citations

Apr 1, 2020·Chemistry : a European Journal·Heng Li, Ying-Jie Zhu
Feb 5, 2021·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Sasireka VelusamyTapas Kumar Mallick
Jun 14, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Muhammad Ahmad MudassirIrshad Hussain
Oct 10, 2020·The Journal of Physical Chemistry Letters·Daniil V KladkoVladimir V Vinogradov

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