Mg-Fe-Al-O spinel: Preparation and application as a heterogeneous photo-Fenton catalyst for degrading Rhodamine B

Jiayu Zhang; Mingwei Yan; Guangchao Sun; Xiang Li; Bianlei Hao; Kaiqi Liu

doi:10.1016/j.chemosphere.2022.135318

Mg-Fe-Al-O spinel: Preparation and application as a heterogeneous photo-Fenton catalyst for degrading Rhodamine B

Chemosphere. 2022 Oct:304:135318. doi: 10.1016/j.chemosphere.2022.135318. Epub 2022 Jun 13.

Authors

Jiayu Zhang¹, Mingwei Yan², Guangchao Sun¹, Xiang Li¹, Bianlei Hao¹, Kaiqi Liu³

Affiliations

¹ State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
² State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
³ State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; University of Chinese Academy of Sciences, Beijing, 100049, China. Electronic address: kqliu@ipe.ac.cn.

PMID: 35709833
DOI: 10.1016/j.chemosphere.2022.135318

Abstract

It is an urgent need to develop new environmentally friendly spinel ferrites with high catalytic efficiency. In this work, a series of Mg-Fe-Al-O spinels with different ratios of Mg/Al were successfully synthesized by the reaction sintering method and were used as a heterogeneous photo-Fenton catalyst for degradation of Rhodamine B (RhB). The effect of different ratios of Mg/Al on the properties of Mg-Fe-Al-O spinel was characterized and analyzed through a range of advanced characterization techniques and DFT calculations. The influence factors on the photo-Fenton reaction catalyzed by Mg-Fe-Al-O spinels were systematically investigated. The results showed that the prepared Mg-Fe-Al-O spinels had larger lattice parameters, wider bandgap, and stronger magnetism, with the Mg content increased. Among them, Mg-9 (Mg_0.88Fe_1.88Al_0.23O₄) had the best catalytic performance in the photo-Fenton reaction. The degradation efficiency of RhB reached 98.45%, and the TOC removal efficiency was 83.47%. The elemental valence and PDOS of Mg-9 (Mg_0.88Fe_1.88Al_0.23O₄) spinels were closer to MgFe₂O₄. The photo-generated holes could directly oxidize water and hydroxyl to generate reactive oxygen species ·OH, improving the catalytic activity.

Keywords: DFT; Mg-Fe-Al-O spinels; Photo-Fenton reaction; Reaction sintering; Rhodamine B.

MeSH terms

Aluminum Oxide
Catalysis
Hydrogen Peroxide*
Iron*
Magnesium Oxide
Rhodamines

Substances

Rhodamines
spinell
Magnesium Oxide
Hydrogen Peroxide
Iron
rhodamine B
Aluminum Oxide