Abstract
Micron-sized cobalt particles (MCP) with nanostructure were fabricated by a magnetic-field-assisted reduction method. Careful investigations suggest that the presence of magnetic field significantly affected the morphology and crystal structure of MCP. With the increase of the magnetic field intensity, the cobalt particles grew from original irregular 3-D dendrite to 2-D foliature, and finally changed to a 3-D flower-like structure with nanostructure. X-ray diffraction investigation suggests that the MCPs are composed of two crystal types, fcc and hcp. The fcc phase component increased with the increase of the applied magnetic field. The obtained MCPs were employed to activate peroxymonosulfate for the degradation of tetracycline (TC). It is found that the magnetically synthesized samples have much higher catalytic activity than that fabricated without magnetic field. The highest TC removal, up to 98.99%, was obtained from the MCP synthesized under 200 mT.
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