An efficient and low-cost magnetic heterogenous Fenton-like catalyst for degrading antibiotics in wastewater: Mechanism, pathway and stability. (15th January 2022)

• Record Type: Journal Article
• Authors: Qiu, Shuxing; Gou, Lizheng; Cheng, Fangqin; Zhang, Mei; Guo, Min
• Is Part Of: Journal of environmental management. Volume 302:Part B(2022)
• Publication Date: 2022-01-15
• Subjects: Doped MgFe2O4 -- Antibiotic -- Heterogeneous Fenton-like catalyst -- Degradation mechanism -- Degrading pathway; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2021.114119
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Metal-doped MgFe2 O4 spinel ferrite synthesized from saprolite laterite nickel ore was verified as an efficient heterogeneous Fenton-like catalyst for degrading antibiotics including tetracycline (TC) and metronidazole (MNZ) in a "catalyst/oxalic acid (H2 C2 O4 )/visible light ( vis )" system. The degradation efficiencies reached over 95% and total organic carbon (TOC) removal efficiencies were nearly 50% of the two antibiotics within 210 min, under the optimal conditions, especially 90% catalytic activity of the fresh catalyst was maintained after five cycles, suggesting the ferrite possessed excellent degrading performance, cycling stability and applicability. Moreover, the degradation mechanism and pathway of TC were elucidated in detail. Results revealed that the [≡Fe(C2 O4 )3 ] 3- complex ions formed by octahedral Fe 3+ in spinel ferrite with oxalate ions on the surface of MgFe2 O4, played the key role in production of ·OH radicals which decomposed antibiotic TC into small molecules even mineralized in three pathways. Cost-effective preparation, high catalytic performance and long cycle life may accelerate the practical application of the heterogeneous Fenton-like catalyst. Graphical abstract: Image 1 Highlights: An efficient catalyst MgFe2 O4 was synthesized from saprolite laterite nickel ore. MgFe2 O4 presented excellent photo-Fenton-like catalytic performance for antibiotics. Degrading mechanism of "catalyst/H2 C2 O4 / vis " system for tetracycline was clarified. Three degradation pathway of tetracycline was elucidated in detail. Low-cost synthesis and long cycle life made the catalyst competitive in application.