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. 2021 Sep 2;22(17):9529. doi: 10.3390/ijms22179529

Figure 2.

Figure 2

Photocatalytic activity of bare and functionalized ZnO NPs toward methylene blue (MB). The efficiency of MB photocatalytic degradation (%) (A) in different light conditions (dark, sunlight and UV irradiation), and (B) for different pH values (pH 3 and 10); (C) MB degradation time-dependency at pH 10 under UV irradiation; (D) UV-vis plot of MB in the presence of ZnO_Chem at pH 10 under UV irradiation. All ZnO NPs were at 1000 μg/mL concentration. The values are expressed as mean ± SD values of three independent experiments (n = 3); * p < 0.001 compared to bare ZnO NPs (ANOVA).