Figure 4.
UV-Vis DRS of photocatalysts: (a) TiO2; (b) 0.1%Fe3O4/SiO2/TiO2; (c) 0.25%Fe3O4/SiO2/TiO2; (d) 0.5%Fe3O4/SiO2/TiO2; (e) 1%Fe3O4/SiO2/TiO2; (f) 5%Fe3O4/SiO2/TiO2; (g) 10%Fe3O4/SiO2/TiO2.
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