178138.fig.005
Figure 5: Removal-efficiency histograms of Zn2+ on Fe3O4@SiO2-CAAQ surface: concentration of Zn2+ (1) before and (2) after Fe3O4@SiO2-CAAQ treatment. The initial concentration of Zn2+ is 100 ppm, the volume of Zn2+ is 10 mL, the weight of nanoparticles is 20 mg, the adsorption time is 12 h, and the temperature is 25°C.