连铸铁泥制备纳米α-Fe<sub>2</sub>O<sub>3</sub>及光催化去除Cr(Ⅵ)

doi:10.13228/j.boyuan.issn1005-4006.20220044

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Abstract Continuous cast iron mud is rich in iron, so resource utilization is an inevitable choice. In this paper, we successfully prepared α-Fe₂O₃ nanoparticles from continuous casting iron sludge by hydrothermal method and realized high value-added utilization. The prepared α-Fe₂O₃ nanoparticles were polymerized into uniform spherical mesoporous structure with a specific surface area of 48.78 m²/g and the average grain size was about 40-50 nm. Large specific surface area and small grain size provided a large number of photocatalytic active sites, which was conducive to improving the photocatalytic performance of the material. Therefore, the α-Fe₂O₃ nanoparticles has a good removal rate of Cr(Ⅵ) polluted wastewater, and the removal rate can reach 100% within 180 min. In addition, after 5 cycles, the removal efficiency of Cr(Ⅵ) can still reach 89.2%, indicating that α-Fe₂O₃ nanoparticles has good reusability. The mechanism of photocatalytic removal of Cr(Ⅵ) was studied. Photogenerated electron (e^-), hydroxyl radical (·OH) and superoxide anion (·O₂^-) are the main active substances involved in the removal of Cr(Ⅵ). Therefore, this study can transform the industrial by-product of continuous cast iron sludge into high value-added nanomaterials, and provides a new idea for the removal of heavy metal wastewater, which has high practical application value.

Key words： iron and steel metallurgy continuous casting iron sludge α-Fe₂O₃ nanoparticles heavy metal treatment photocatalytic

Received: 28 March 2022

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	Articles by authors
	ZHAO Ze-kun
	LI Su-qin
	GUO Peng-hui

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ZHAO Ze-kun,LI Su-qin,GUO Peng-hui. Photocatalytic removal of Cr(Ⅵ) from α-Fe₂O₃ nanoparticles prepared by continuous casting iron sludge[J]. CONTINUOUS CASTING, 2022, 41(5): 30-36.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20220044 OR http://www.chinamet.cn/Jweb_lz/EN/Y2022/V41/I5/30

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