Facile synthesis of magnetic ZnFe2O4–reduced graphene oxide hybrid and its photo-Fenton-like behavior under visible iradiation

Abstract

A magnetic ZnFe2O4-reduced graphene oxide (rGO) hybrid was successfully developed as a heterogeneous catalyst for photo-Fenton-like decolorization of various dyes using peroxymonosulfate (PMS) as an oxidant under visible light irradiation. Through an in situ chemical deposition and reduction, ZnFe2O4 nanoparticles (NPs) with an average size of 23.7 nm were anchored uniformly on rGO sheets to form a ZnFe2O4-rGO hybrid. The catalytic activities in oxidative decomposition of organic dyes were evaluated. The reaction kinetics, effect of ion species and strength, catalytic stability, degradation mechanism, as well as the roles of ZnFe2O4 and graphene were also studied. ZnFe2O4-rGO showed to be a promising photocatalyst with magnetism for the oxidative degradation of aqueous organic pollutants and simple separation. The combination of ZnFe2O4 NPs with graphene sheets leads to a much higher catalytic activity than pure ZnFe2O4. Graphene acted as not only a support and stabilizer for ZnFe2O4 to prevent them from aggregation, largely improving the charge separation in the hybrid material, but also a catalyst for activating PMS to produce sulfate radicals at the same time. The ZnFe2O4-rGO hybrid exhibited stable performance without losing activity after five successive runs.

Self‐Supportive NiFe hydroxide with High Electrocatalytic Activity for Oxygen and Hydrogen Evolution Reaction

“…Figure S4 (SI) exhibited the XPS spectra of Fe2p 3/2 (Figure S4A, SI) and Ni2p 3/2 (Figure S4B, SI) of Fe 0.2 Ni 1.8 OH. The peaks at the binding energy of 711.55 eV, 713.97 eV, 719.18 eV, 725.78 eV, 711.55 eV and 719.18 eV should be related to Fe 3+ ,, while others were related to Fe 2+ ,. The amount of Fe 3+ was about 46.8% (Figure S4A, SI).…”

Heterogeneous photo-Fenton degradation of methyl orange by Fe2O3/TiO2 nanoparticles under visible light

“…However, UV light-based photo Fenton oxidation also has practical limitations; that is inability to utilize sunlight as an irradiation source since UV light only consists of approximately 5% of sunlight [19,20]. Consequently, significant efforts to develop various photo-Fenton catalysts have been made to utilize visible light as the major proportion of the solar light source [21]. Recent studies reported visible light mediated photo-Fenton oxidation by employing TiO 2 , CdS, WO 3 coated with iron oxides.…”

Synthesis of graphene–transition metal oxide hybrid nanoparticles and their application in various fields

“…Song et al have prepared a ZnFe 2 O 4 –graphene hybrid by a self-assembly method for application in LIBs [333]. The hybrid acts as a catalyst for decolourisation of various dyes, elimination of the organic pollutant under visible light irradiation, and the magnetic properties of the sample helps for the easy separation from the solution [334]. …”