Magnetic MnFe2O4/MoS2 nanocomposites synthesis for rapid degradation of sulfamethoxazole by activated peroxymonosulfate

Background Sulfamethoxazole (SMX), as a widely used antibiotic, has been frequently detected in various environments. The accumulation of SMX in water has posed potential risk to the biology and human health. Advanced oxidation technology (AOPs) is an effective method to remove refractory organic pollutants, which has drawn great attention in recent years. Methods Magnetic MnFe 2 O 4 /MoS 2 nanocomposites were synthesized by a two-step hydrothermal method, and characterized with different physicochemical methods. The catalytic performance and mechanism of MnFe 2 O 4 /MoS 2 were studied by the degradation of SMX under peroxisate (PMS) condition. Significant findings The catalytic performance of MnFe 2 O 4 /MoS 2 nanocomposites was superior to that of individual MnFe 2 O 4 or MoS 2 due to the cyclic effect of Fe(II)/Fe(III) and Mn(II)/Mn(III) occurred in the interfaces of MnFe 2 O 4 /MoS 2 . The degradation efficiency of SMX reached 99.1% within 15 min at room temperature, and the catalytic system can maintain a high degradation efficiency in a wide pH range of 3.0 ∼ 9.0. EPR and radical burst experiments showed the main active species of the MnFe 2 O 4 /MoS 2 –3/PMS reaction system were SO 4 •- and • OH radicals. Furthermore, the catalyst exhibits superparamagnetic properties and good stability to enable its recycle and reuse.