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Fig. 12. The effects of (a) H2O2 amount, (b) photocatalyst dosage, and (c) initial dye concentration on visible-light driven photodegradation efficiency. Conditions: [MB] = 25 mg L−1, 100 mL, [cat] = 50 mg, [H2O2] = 4 mM, 25 °C and time = 180 min.