Selective Adsorption and Photocatalytic Degradation of Dyes Using Polyoxometalate Hybrid Supported on Magnetic Activated Carbon Nanoparticles under Sunlight, Visible, and UV Irradiation

Figure 8

UV-Vis absorption spectra of MO (20 mg/L, 20 mL, pH = without adjustment = 4.5) (a) and the mixed solution of MO and MB (each dye 10 mg/L, total volume = 40 mL, pH = without adjustment = 6.3) (b) during the adsorption on 0.65 g/L and 0.32 g/L of MAC-HMT-STA-MB, respectively, in the dark; spectra of the mixed solution of MO (16 mg/L) and MB (45 mg/L, total volume = 50 mL) during the photodegradation under sunlight in the presence of the MAC-HMT-STA-MB (0.44 g/L) in the pH = 8.2 (without adjustment) (c) and pH = 2.5 (d) and corresponding digital images of the mixed solutions before and after irradiation. Note: in all experiments, the absorbance was measured in a 10 mm cell except the mixed solution of MO (16 mg/L) and MB (45 mg/L) (c and d) that were measured in a 1 mm cell.

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