Enhanced Fenton, photo‐Fenton and peroxidase-like activity and stability over Fe3O4/g-C3N4 nanocomposites

doi:10.1016/S1872-2067(17)62957-7

Abstract

Abstract:

We prepared the Fe₃O₄/g-C₃N₄ nanoparticles (NPs) through a simple electrostatic self-assembly method with a 3:97 weight ratio to investigate their Fenton, photo-Fenton and oxidative functionalities besides photocatalytic functionality. We observed an improvement of the Fenton and photo-Fenton activities of the Fe₃O₄/g-C₃N₄ nanocomposites. This improvement was attributed to efficient charge transfer between Fe₃O₄ and g-C₃N₄ at the heterojunctions, inhibition of electron-hole recombination, a high surface area, and stabilization of Fe₃O₄ against leaching by the hydrophobic g-C₃N₄. The obtained NPs showed a higher degradation potential for rhodamine B (RhB) dye than those of Fe₃O₄ and g-C₃N₄. As compared to photocatalysis, the efficiency of RhB degradation in the Fenton and photo-Fenton reactions was increased by 20% and 90%, respectively. Additionally, the horseradish peroxidase (HRP) activity of the prepared nanomaterials was studied with 3,3,5,5-tetramethylbenzidinedihydrochloride (TMB) as a substrate. Dopamine oxidation was also examined. Results indicate that Fe₃O₄/g-C₃N₄ nanocomposites offers more efficient degradation of RhB dye in a photo-Fenton system compared with regular photocatalytic degradation, which requires a long time. Our study also confirmed that Fe₃O₄/g-C₃N₄ nanocomposites can be used as a potential material for mimicking HRP owing to its high affinity for TMB. These findings suggest good potential for applications in biosensing and as a catalyst in oxidation reactions.

Key words: Fe₃O₄/g-C₃N₄ nanocomposites, Fenton reaction, Dye degradation, Peroxidase activity, Horseradish peroxidase mimicking, Dopamine oxidation

Shafaq Sahar, Akif Zeb, Yanan Liu, Naseeb Ullah, Anwu Xu. Enhanced Fenton, photo‐Fenton and peroxidase-like activity and stability over Fe₃O₄/g-C₃N₄ nanocomposites[J]. Chinese Journal of Catalysis, 2017, 38(12): 2110-2119.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(17)62957-7

https://www.cjcatal.com/EN/Y2017/V38/I12/2110

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Enhanced Fenton, photo‐Fenton and peroxidase-like activity and stability over Fe₃O₄/g-C₃N₄ nanocomposites

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