Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Oxygen Vacancy-Rich Fe@Fe3O4 Boosting Fenton Chemistry

These authors contributed equally
Version 1 : Received: 25 May 2023 / Approved: 26 May 2023 / Online: 26 May 2023 (10:05:52 CEST)

A peer-reviewed article of this Preprint also exists.

Zheng, R.; Tan, R.; Lv, Y.; Mou, X.; Qian, J.; Lin, R.; Fang, P.; Kan, W. Oxygen-Vacancy-Rich Fe@Fe3O4 Boosting Fenton Chemistry. Catalysts 2023, 13, 1057. Zheng, R.; Tan, R.; Lv, Y.; Mou, X.; Qian, J.; Lin, R.; Fang, P.; Kan, W. Oxygen-Vacancy-Rich Fe@Fe3O4 Boosting Fenton Chemistry. Catalysts 2023, 13, 1057.

Abstract

Iron-based materials are widely applied in Fenton chemistry and they have promising prospects in the processing of wastewater. The composition complexity and rich chemistry of iron and/or oxides, however, hamper the precise understanding on the active sites and the working mechanism which still remain highly controversial. Herein, iron oxides of four different model systems are designed through a conventional precipitation method plus H2 reduction treatment. These systems feature Fe@Fe3O4 with abundant oxygen vacancy, Fe0 and Fe3O4 particles with interface structures, and Fe3O4-dominated nanoparticles of different sizes. These materials are applied in the decomposition of methyl orange as a model reaction to assess the Fenton chemistry. The Fe@Fe3O4 with core-shell structures exhibited significantly higher decomposition activity than the other Fe3O4-rich nanoparticles. A thin Fe3O4 layer formed by auto-oxidation of iron particles when exposing to air can boost the activity as compared with the Fe0 and Fe3O4 particles with interface structures but poor oxygen vacancy. The unique hetero-structure with the co-existence of both metallic iron and oxygen vacancy displayed excellent redox propensity which might account for the superior Fenton activity. This finding provides a new perspective to understand and design highly efficient iron-based Fenton catalysts.

Keywords

Advanced oxidation process; Core-shell structure; Fenton chemistry; Fe@Fe3O4 interface; Methyl orange decomposition; Oxygen vacancy

Subject

Chemistry and Materials Science, Applied Chemistry

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