In this study, we present an effective modification strategy for cobalt ferrate (CoFe₂O₄), a cost-effective heterogeneous Fenton catalyst. Electron microscopic observation and X-ray diffraction results confirmed the successful hydrothermal synthesis of F-CoFe₂O₄/MoS₂. Notably, F-CoFe₂O₄/MoS₂ exhibited a high pollutant degradation efficiency (over 90 % within 30 min) across a broad pH range (4.0–9.0), along with excellent cyclic stability (up to 10 cycles) and environmental robustness. The effectiveness of the catalyst in treating real water samples and its performance in continuous-flow operations were also demonstrated. Fluorine (F) doping and integration with molybdenum sulfide (MoS₂) as a co-catalyst significantly facilitated metal ion release and promoted the formation of an acidic microenvironment on the catalyst surface, which accelerated Fe³ ⁺/Fe²⁺ cycling and enhanced CoFe₂O₄ performance in H₂O₂ activation and pollutant degradation. This work provides valuable insights for designing more efficient catalysts for heterogeneous Fenton oxidation systems in water treatment applications.
This study presents the rational design of a magnetically recoverable CoFe 2 O 4 /BiVO 4 @g-C 3 N 4 (CFO/BVO@CN) ternary heterojunction for highly efficient levofloxacin (LVFX) degradation via peroxymonosulfate (PMS) activation under visible light. The key innovation lies in the synergistic integration of a unique charge transfer pathway with interfacial M-N (M = Co, Fe, Bi, V) chemical bonding, as unequivocally evidenced by XPS. This atomic-level interfacial engineering creates efficient electron channels that not only promote the spatial separation of photogenerated carriers but also dramatically accelerate the dual redox cycles of metal species (Co 2+ /Co 3+ , Fe 2+ /Fe 3+ ).Crucially, the V 4+ /V 5+ pair functions as an efficient electron shuttle, facilitating the rapid regeneration of PMS-active Co 2+ and Fe 2+ sites and sustaining a high-efficiency catalytic process. Consequently, the optimized system achieves an exceptional LVFX removal rate of 98.8% within 30 min, driven predominantly by singlet oxygen ( 1 O₂) and superoxide radicals ( • O 2 − ). The catalyst demonstrates robust stability over multiple cycles, facile magnetic separation, and effective detoxification of LVFX. This work provides a novel paradigm for developing multifunctional photocatalytic systems by marrying heterojunction engineering with atomic-level interface modulation for sustainable water purification.
Guo Rui,Li Shutong,Duan RongXia,Sun Yunjun,Li Jianhui,Wu Yanzhao,Wang Lianjun,Jiang Wan
Overcoming the challenge of decoupling impedance matching from attenuation for low-frequency (2–10 GHz) electromagnetic wave absorption, this work presents a defect-engineered multiphase medium-entropy sulfide composite. Synthesized via integrated mechanical alloying and surfactant-assisted hydrothermal sulfidation, the composite integrates sulfur vacancy-rich (Fe,Co,Ni) 9 S 8 , anisotropic FeCoNi alloy, CoFe₂O₄, and porous MoS 2 . This architecture creates abundant heterogeneous interfaces and interfacial sulfur vacancies, significantly enhancing defect-induced polarization and dielectric loss via the “Janus effect.” Concurrently, the magnetic components boost magnetic loss while optimizing impedance matching. Benefiting from this magneto-dielectric synergy, the composite achieves exceptional absorption: a minimum reflection loss ( RL min ) of -50.4 dB at 3.96 GHz and a remarkable RL min -77.5 dB at 9 GHz. Radar cross-section simulations confirm application potential. This work provides strategic insights for designing innovative low-/mid-frequency absorbers through synergistic dielectric-magnetic loss in polymetallic sulfide heterostructures.
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