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Photocatalytic activity of as-obtained Cu 2 O products under visible light. (a) Plots of concentration ratios of MO in an aqueous solution against given irradiation intervals in the presence or absence of Cu2O products for samples S1 to S4, which depicted the synthesis conditions as listed in Table 1. (b) The plots of ln(C/C 0) versus time of MO degradation in presence of Cu2O products, without H2O2.
