Figure 5

Hysteresis loop spectra of Fe3O4 microspheres (a), Fe3O4/C core–shell microspheres (b), Fe3O4/C/MnO2 flower-like microspheres (c) and flower-like Fe3O4/C/MnO2/C3N4 photocatalyst (d).

Hysteresis loop spectra of Fe3O4 microspheres (a), Fe3O4/C core–shell microspheres (b), Fe3O4/C/MnO2 flower-like microspheres (c) and flower-like Fe3O4/C/MnO2/C3N4 photocatalyst (d).