Supermagnetic Mn-substituted ZnFe2O4 with AB-site hybridization for the ultra-effective catalytic degradation of azoxystrobin

Zhong Ting Hu, Zi Yan Jin, Si Yan Gong, Xiuzhen Wei, Jia Zhao, Mian Hu*, Jun Zhao*, Zhong Chen, Zhiyan Pan, Xiaonian Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Spinel ferrites with magnetic properties have great potential for the decontamination of aqueous systems due to their ease of recycling by magnetic separation. Herein, the purpose is to enhance ZnFe2O4 spinel properties in terms of magnetization and catalytic performance via Mn substitution into the crystal structure. Zn1−xMnxFe2O4 (x = 0-1) nanoclusters were successfully synthesized via an optimal hydrothermal process, in which additives (i.e., citric acid and ammonia) play key roles in inhibiting impurity phase formation via homogenizing the distribution of metal ions and slowing down the reaction rate. At a Zn/Mn ratio of 1 : 3, the nanocluster Zn0.25Mn0.75Fe2O4 (ZMF0.75) composed of nanoparticles with sizes ranging from 5 to 10 nm shows the highest saturation magnetization (Ms = 68 emu g−1, which is ∼5 times greater than that of ZnFe2O4) and the best catalytic performance, with >99% azoxystrobin (AZX) degradation in a Fenton-like system. Moreover, the findings unveiled that the balance of Zn and Fe occupation in the polyhedron centres in the spinel crystal is broken upon replacing Zn with Mn. In all probability, the Zn/Fe/Mn cross-occupation phenomenon is essential for enhancing the activity of Fe and Mn multivalent metal atoms. A plausible mechanism for the synergistic effect of multiple active sites in ZMF0.75 on the formation of HO˙ and HO2˙ radicals is proposed. This work proves that Mn-substituted ZnFe2O4 could be an efficient heterogeneous Fenton-like catalyst for EOC decontamination in aqueous systems with ease for recycling via magnetic separation.

Original languageEnglish
Pages (from-to)3137-3147
Number of pages11
JournalCatalysis Science and Technology
Volume12
Issue number10
Early online date21 Apr 2022
DOIs
Publication statusPublished - 21 May 2022

Scopus Subject Areas

  • Catalysis

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