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Figure 4 | Nanoscale Research Letters

Figure 4

From: Hydrothermal synthesis of 3D hollow porous Fe3O4 microspheres towards catalytic removal of organic pollutants

Figure 4

Removal efficiency of methylene blue. (a) Effect of the concentration of 3D hollow porous Fe3O4 microspheres on the removal efficiency of methylene blue (2 μg/mL) in the presence of H2O2 (0.4 M) and ultrasound irradiation, pH = 5.0. (b) Effect of the concentration of H2O2 on the removal efficiency of methylene blue (2 μg/mL) in the presence of 3D hollow porous Fe3O4 microspheres (2 μg/mL), pH = 5.0.

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