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Photocatalytic activity against methylene blue (MB) for: (a) ZnO_C1; (b) ZnO_C2; (c) ZnO_C3; (d) ZnO_C4; (e) ZnO_C5; (f) ZnO_C6; (g) detail for all samples after 40 min irradiation; (h) the proposed mechanism for photo-degradation of the dye.
