Abstract
Amino/thiol-functionalized MnFe2O4 magnetic nanomaterials (MnFe2O4-NH2/MnFe2O4-HS) were successfully synthesized and well characterized by a variety of characterization methods. The prepared nanomaterials were tested as heterogeneous Fenton catalysts for the degradation of azithromycin antibiotic. After surface functionalization, MnFe2O4-NH2 and MnFe2O4-HS showed superior catalytic activity than that of MnFe2O4 in terms of azithromycin removal and H2O2 decomposition. MnFe2O4-HS presented the highest catalytic performance, achieving 92.6% of azithromycin removal and 62.5% of TOC removal. Effect of solution pH, iron leaching, primary reactive oxidizing species, and the role of amino/thiol surface groups were also investigated. The results showed that •OH radicals are the main reactive oxidizing species in the heterogeneous Fenton degradation of azithromycin. The enhanced catalytic activity after surface functionalization may be attributed to the reduction of aggregation, the decrease of iron leaching, the enhancement of oxidation capacity and the affinity between amino and H2O2 molecules. Besides, the study of the stability and reusability of MnFe2O4-NH2 and MnFe2O4-HS indicated both of them presented a high catalytic performance even after five consecutive runs.
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