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.
PAN J J, GUO F, SUN H R, et al. Nanodiamond decorated 2D hexagonal Fe2O3 nanosheets with a Z-scheme photogenerated electron transfer path for enhanced photocatalytic activity[J]. Journal of Materials Science, 2021, 56:6663.
[9]
Gonzalez L O, Mikhalovsky V S, Václavíková M, et al. Novel nanostructured iron oxide cryogels for arsenic (As(III)) removal[J]. Journal of Hazardous Materials, 2020, 381 (5):120996.
[10]
Bulin C K, Li B, Zhang Y H, et al. Removal performance and mechanism of nano α-Fe2O3/graphene oxide on aqueous Cr(Ⅵ)[J]. Journal of Physics and Chemistry of Solids, 2020, 147:109659.
[11]
WANG J C, REN J, YAO H C, et al. Synergistic photocatalysis of Cr(Ⅵ) reduction and 4-Chlorophenol degradation over hydroxylated α-Fe2O3 under visible light irradiation[J]. Journal of Hazardous Materials, 2016, 311 (5):11.
LIU T Y, WANG C X, WANG W, et al. The enhanced properties in photocatalytic wastewater treatment:Sulfanilamide (SAM) photodegradation and Cr6+ photoreduction on magnetic Ag/ZnFe2O4 nanoarchitectures[J]. Journal of Alloys and Compounds, 2021, 867 (25):159085.
[17]
LIN S, LU D N, LIU Z. Removal of arsenic contaminants with magnetic γ-Fe2O3 nanoparticles[J]. Chemical Engineering Journal, 2021, 211 (15):46.
[18]
TANG W S, LI Q, GAO S A, et al. Arsenic (III,V) removal from aqueous solution by ultrafine α-Fe2O3 nanoparticles synthesized from solvent thermal method[J]. Journal of Hazardous Materials, 2011, 192 (15):131.
[19]
Didari J, Sadeghzadeh A. Ni-N codoped SnO2/Fe2O3 nanocomposite as advanced bifunctional photocatalyst for simultaneous photocatalytic redox conversion of Cr(Ⅵ) and As(III)[J]. Journal of the Taiwan Institute of Chemical Engineers, 2021, 119:232.
[20]
ZHU B K, SONG D B, JIA T B, et al. Effective visible light-driven photocatalytic degradation of ciprofloxacin over flower-like Fe3O4/Bi2WO6 composites[J]. ACS Omega, 2021, 6 (2):1647.
[21]
Ghoreishian S M, Ranjith K S, Park B, et al. Full-spectrum-responsive Bi2S3@CdS S-scheme heterostructure with intimated ultrathin RGO toward photocatalytic Cr(Ⅵ) reduction and H2O2 production: Experimental and DFT studies[J]. Chemical Engineering Journal, 2021, 419 (1):129530.
2022, Vol. 41 
