Magnetically Separable Mixed-Phase alpha/gamma-Fe2O3 Catalyst for Photo-Fenton-like Oxidation of Rhodamine B

Magnetically Separable Mixed-Phase alpha/gamma-Fe2O3 Catalyst for Photo-Fenton-like Oxidation of Rhodamine B

WoS Article

Iron oxides are widely used as catalysts for photo-Fenton-like processes for dye oxidation. In this study, we report on the synthesis of an a/?-Fe2O3 mixed-phase catalyst with magnetic properties for efficient separation. The catalyst was synthesized using glycine-nitrate precursors. The synthesized a/?-Fe2O3 samples were characterized using scanning electron microscopy, X-ray diffraction spectroscopy (XRD), Raman shift spectroscopy, X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometer (VSM). The diffraction peaks were indexed with two phases, a-Fe2O3 as the main phase (79.6 wt.%) and ?-Fe2O3 as the secondary phase (20.4 wt.%), determined using the Rietveld refinement method. The presence of Fe2+ was attributed to oxygen vacancies. The mixed-phase a/?-Fe2O3 catalyst exhibited remarkable photo-Fenton-like degradation performance for Rhodamine B (RhB) in neutral pH. The effects of operating parameters, including H2O2 concentration, catalyst concentration, and RhB concentration, on the degradation efficiency were investigated. The removal rates of color were 99.2% after 12 min at optimal conditions of photo-Fenton-like oxidation of RhB. The sample exhibited a high saturation magnetization of 28.6 emu/g. Additionally, the a/?-Fe2O3 mixed-phase catalyst showed long-term stability during recycle experiments, with only a 5% decrease in activity.

Iron oxides are widely used as catalysts for photo-Fenton-like processes for dye oxidation. In this study, we report on the synthesis of an a/?-Fe2O3 mixed-phase catalyst with magnetic properties for efficient separation. The catalyst was synthesized using glycine-nitrate precursors. The synthesized a/?-Fe2O3 samples were characterized using scanning electron microscopy, X-ray diffraction spectroscopy (XRD), Raman shift spectroscopy, X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometer (VSM). The diffraction peaks were indexed with two phases, a-Fe2O3 as the main phase (79.6 wt.%) and ?-Fe2O3 as the secondary phase (20.4 wt.%), determined using the Rietveld refinement method. The presence of Fe2+ was attributed to oxygen vacancies. The mixed-phase a/?-Fe2O3 catalyst exhibited remarkable photo-Fenton-like degradation performance for Rhodamine B (RhB) in neutral pH. The effects of operating parameters, including H2O2 concentration, catalyst concentration, and RhB concentration, on the degradation efficiency were investigated. The removal rates of color were 99.2% after 12 min at optimal conditions of photo-Fenton-like oxidation of RhB. The sample exhibited a high saturation magnetization of 28.6 emu/g. Additionally, the a/?-Fe2O3 mixed-phase catalyst showed long-term stability during recycle experiments, with only a 5% decrease in activity.

iron oxides; a/?-Fe2O3 mixed-phase catalyst; magnetically separable; Rhodamine B; photo-Fenton-like

iron oxides; a/?-Fe2O3 mixed-phase catalyst; magnetically separable; Rhodamine B; photo-Fenton-like

MAGOMEDOVA, A.; ISAEV, A.; ORUDZHEV, F.; SOBOLA, D.; KH. RABADANOV, M.; RABADANOVA, A.; NABI, S.; ZHU, M.; EMIROV, R.; KH. GADZHIMAGOMEDOV, S.; ALIKHANOV, N.; KAVIYARASU, K.

2024

11.05.2023

MDPI

BASEL

2073-4344

Catalysts

13

5

Swiss Confederation

1

13

13

https://www.mdpi.com/2073-4344/13/5/872

http://hdl.handle.net/11012/213548

catalysts-13-00872