High-efficient separation of photoinduced charge carriers in CoFe2O4-ZnO magnetic heterostructures mediated by oxygen vacancies
Source abstract
Abstract
• CoFe 2 O 4 -ZnO composites with three relative concentrations were prepared. • CoFe 2 O 4 has a degree of inversion of 0.7 with spin-up states above the valence band. • Ferrite proximity induces ferromagnetic coupling of oxygen vacancies (V O ) in ZnO. • V O assisted spin-polarized photocatalytic Rhodamine B degradation is produced. In this work, magnetic heterostructures were obtained by the in-situ growth of various ZnO amounts on the preformed CoFe 2 O 4 nanoparticles. The X-ray diffraction characterization shows the presence of both ZnO and CoFe 2 O 4 crystalline phases, and the crystallite size is about 13–14 nm for both components. X-Ray Photoelectron Spectroscopy (XPS) analysis revealed a CoFe 2 O 4 inversion degree of 0.7. The composite samples demonstrated an extended absorption edge into the visible range. The sample’s magnetic properties were investigated by vibrating-sample magnetometer (VSM) and correlated with Electron Paramagnetic Resonance (EPR) results. The magnetic behavior was attributed to the combination of CoFe 2 O 4 and ferromagnetic ZnO. The emergence of a ferromagnetic phase within ZnO was elucidated to originate from charge/spin transfer of spin-up polarized states from the CoFe 2 O 4 Fermi level into empty oxygen vacancies of ZnO. High efficiency in Rhodamine B (RhB) degradation under visible light was observed in the prepared composite materials, particularly with an optimal CoFe 2 O 4 -ZnO ratio of 1:5, achieving an 81 % degradation rate within 6 h. The proposed photodegradation mechanism, based on various spectroscopic and magnetic investigations, highlights the role of spin transfer and oxygen vacancies in facilitating reactive oxygen species (ROS) generation for pollutant degradation.
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Research context
OpenAlex topics: ZnO doping and properties · Copper-based nanomaterials and applications · Magnetic Properties and Synthesis of Ferrites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (50)
Show source-provided references
1. ZnIn2S4/CoFe2O4 p-n junction-decorated biochar as magnetic recyclable nanocomposite for efficient photocatalytic degradation of ciprofloxacin under simulated sunlight10.1016/j.seppur.2022.122156 ↗
2. A comparative study on recent progress in efficient ZnO based nanocomposite and heterojunction photocatalysts: a review
3. S. Wu, X. Li, Y. Tian, Yan Lin, Y.H. Hu, Excellent photocatalytic degradation of tetracycline over black anatase-TiO2 under visible light, Chem. Eng. J. 406 (2021) 126747, doi:10.1016/j.cej.2020.126747.10.1016/j.cej.2020.126747 ↗
4. Enhanced photocatalytic activity of Co doped SnO2 nanoparticles by controlling the oxygen vacancy states10.1016/j.optmat.2020.110472 ↗
5. D. Toloman, M. Stefan, O. Pana, A. M. Rostas, T. Danut Silipas, F. Pogacean, S. Pruneanu, C. Leostean, L. Barbu-Tudoran, A. Popa Transition metal ions as a tool for controlling the photocatalytic activity of MWCNT-TiO2 nanocomposites, J.Alloys .Comp. 921 (2022) 166095, doi: 10.1016/j.jallcom.2022.166095.10.1016/j.jallcom.2022.166095 ↗
6. Fabrication of BiOBr nanosheets@ TiO2 nanobelts p–n junction photocatalysts for enhanced visible-light activity10.1016/j.apsusc.2015.12.249 ↗
7. An excellent Z-scheme Ag2MoO4/Bi4Ti3O12 heterojunction photocatalyst: construction strategy and application in environmental purification10.1016/j.apt.2021.01.039 ↗
8. UV and visible light photocatalytic activity of Au/TiO2 nanoforests with Anatase/Rutile phase junctions and controlled Au locations10.1038/srep41253 ↗
9. W. Gao, R. Peng, Y. Yang, X. Zhao, C. Cui, X. Su, W. Qin, Y. Dai, Y. Ma, H. Liu, Y. Sang electron spin polarization-enhanced photoinduced charge separation in ferromagnetic ZnFe2O4, ACS Energy Lett. 6 (2021) 2129, doi: 10.1021/acsenergylett.1c00682.10.1021/acsenergylett.1c00682 ↗
10. Manipulating spin polarization of titanium dioxide for efficient photocatalysis10.1038/s41467-020-14333-w ↗
11. Electron spin polarization-mediated charge separation in Pd/CoP@CoNiP superstructures toward optimized photocatalytic performance10.1016/j.nanoen.2022.107616 ↗
12. Oxygen vacancy-induced spin polarization of tungsten oxide nanowires for efficient photocatalytic reduction and immobilization of uranium (VI) under simulated solar light10.1016/j.apcatb.2022.122202 ↗
13. High-efficiency separation and transfer of photo-induced charge carrier in graphene/TiO2 via heterostructure in magnetic field10.1016/j.jallcom.2020.158283 ↗
14. Highly efficient flower-like ZnIn2S4/CoFe2O4 photocatalyst with p-n type heterojunction for enhanced hydrogen evolution under visible light irradiation10.1016/j.jcis.2023.03.055 ↗
15. Preparation of core-shell structured CoFe2O4 incorporated Ag3PO4 nanocomposites for photocatalytic degradation of organic dyes10.1016/j.matdes.2016.07.043 ↗
16. Assembling g-C3N4 nanosheets on rod-like CoFe2O4 nanocrystals to boost photocatalytic degradation of ciprofloxacin with peroxymonosulfate activation
17. Tunable electromagnetic and enhanced microwave absorption properties in CoFe2O4 decorated Ti3C2 MXene composites10.1016/j.apsusc.2019.144210 ↗
18. Interface engineering of heterojunction photocatalysts based on 1D nanomaterials10.1039/D0CY01847C ↗
19. Preparation and photocatalytic properties of hybrid core–shell reusable CoFe2O4–ZnO nanospheres10.1016/j.jmmm.2012.02.009 ↗
20. S. Krishna, P. Sathishkumar, N. Pugazhenthiran, Kiros Guesh, R. V. Mangalaraja, S. Kumaran, M. A. Gracia-Pinilla, S. Anandan, Magnetically recyclable CoFe2O4/ZnO nanocatalysts for the efficient catalytic degradation of Acid Blue 113 under ambient conditions, RSC Adv., 10 (2020) 16473, doi:10.1039/d0ra00082e.10.1039/D0RA00082E ↗
21. ZnO supported CoFe2O4 nanophotocatalysts for the mineralization of Direct Blue71 in aqueous environments10.1016/j.jhazmat.2013.02.030 ↗
22. Investigation the photocatalytic activity of CoFe2O4/ZnO and CoFe2O4/ZnO/Ag nanocomposites for purification of dye pollutants10.1016/j.seppur.2018.09.054 ↗
23. M. Stefan, C. Leostean, A. Popa, D. Toloman, I. Perhaita, A. Cadis, S. Macavei, O. Pana, Highly stable MWCNT-CoFe2O4 photocatalyst. EGA-FTIR coupling as efficient tool to illustrate the formation mechanism, J. Alloys Comp. 928 (2022) 167188, doi: 10.1016/j.jallcom.2022.167188.10.1016/j.jallcom.2022.167188 ↗
24. O. Pana, C. Leostean, M.L. Soran, M. Stefan, S. Macavei, S. Gutoiu, V. Pop, O. Chauvet Synthesis and characterization of Fe–Pt based multishell magnetic nanoparticles, J. Alloys . Comp. 574 (2013) 477, doi:10.1016/j.jallcom.2013.05.153.10.1016/j.jallcom.2013.05.153 ↗
25. New Insights into the magnetic properties of CoFe2O4@ SiO2@ Au magnetoplasmonic nanoparticles10.3390/nano12060942 ↗
26. Enhanced gas-sensitivity and ferromagnetism performances by the Ni-doping induced oxygen vacancies in (Mn, Ni) codoped ZnO nanorods10.1016/j.apsusc.2019.06.014 ↗
27. Synergetic effect of photocatalysis and peroxymonosulfate activated by MFe2O4 (M = Co, Mn, or Zn) for enhanced photocatalytic activity under visible light irradiation10.1039/D2RA03558H ↗
28. Ultra-small and highly dispersive iron oxide hydroxide as an efficient catalyst for oxidation reactions: swiss-army-knife catalyst10.1038/s41598-021-85672-x ↗
29. Tailoring the RhB removal rate by modifying the PVDF membrane surface through ZnO particles deposition10.1007/s10904-020-01795-0 ↗
30. Solvothermal synthesis and characterization of sandwich-like graphene/ZnO nanocomposites10.1016/j.apsusc.2009.11.034 ↗
31. Cytotoxicity of ZnO nanoparticles can be tailored by modifying their surface structure: a green chemistry approach for safer nanomaterials10.1021/sc500140x ↗
32. Probing optical band gaps at the nanoscale in NiFe2O4 and CoFe2O4 epitaxial films by high resolution electron energy loss spectroscopy10.1063/1.4895059 ↗
33. Chemical tuning of the optical band gap in spinel ferrites: CoFe2O4 vs NiFe2O410.1063/1.4818315 ↗
34. Metal-semiconductor transition in NiFe2O4 nanoparticles due to reverse cationic distribution by impedance spectroscopy10.1063/1.3582142 ↗
35. Size-induced effect on nano-crystalline CoFe2O410.1016/j.jmmm.2008.01.021 ↗
36. Structural, magnetic, and microwave absorbing properties of NiTiO3/ CoFe2O4 composites10.1016/j.jallcom.2022.165051 ↗
37. spin-glass-like freezing of inner and outer surface layers in hollow γ-Fe2O3 nanoparticles10.1038/srep15054 ↗
38. Z, The law of approach to saturation in ferromagnets originating from the magnetocrystalline anisotropy10.1016/j.jmmm.2010.02.040 ↗
39. Electron paramagnetic resonance of ferrite nanoparticles10.1063/1.1332417 ↗
40. Unveiling the physicochemical Features of CoFe2O4 nanoparticles synthesized via a variant hydrothermal method: NMR relaxometric properties10.1021/acs.jpcc.5b00717 ↗
41. Surface spin disorder and spin-glass-like behavior in manganese-substituted cobalt ferrite nanoparticles10.1007/s11051-012-1156-2 ↗
42. Microwave resonant and zero-field absorption study of doped magnetite prepared by a Co-precipitation method10.3390/molecules19068387 ↗
43. Temperature dependence of the ferromagnetic resonance (FMR) for MnxCo1−xFe2O4 (0 ≤ x ≤ 1) nanoparticles
44. Magnetic resonance in nanoparticles: between ferro- and paramagnetism
45. FMR and magnetization study of ZnFe2O4 nanoparticles in 0.40Fe2O3 / 0.60ZnO nanocomposite10.1109/TMAG.2014.2341216 ↗
46. Growing Co doped TiO2 nanosheets on reduced graphene oxide for efficient photocatalytic removal of tetracycline antibiotic from aqueous solution and modeling the process by artificial neural network10.1016/j.jallcom.2019.05.175 ↗
47. S. Tiwari, A. Gaur, R. Vaish, Sonocatalysis and Photocatalysis in Ba0.5Sr0.5TiO3 ceramics, Int. J. Appl. Ceram. Tec., 20 (2023) 3127, 10.1111/ijac.14467.10.1111/ijac.14467 ↗
48. Energetics of intrinsic defects and their complexes in ZnO investigated by density functional calculations10.1103/PhysRevB.83.045206 ↗
49. Interplay between ferromagnetism and photocatalytic activity generated by Fe3+ ions in iron doped ZnO nanoparticles grown on MWCNTs10.1016/j.physe.2020.114581 ↗
50. New emerging magnetic, optical and photocatalytic properties of Tb doped TiO2 interfaced with CoFe2O4 nanoparticles10.1016/j.apsusc.2021.151172 ↗