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The photocatalytic performance of NiO/ZnO/SBA-15 samples with different NiO/ZnO content: (a) 20 % NiO/ZnO/SBA-15, (b) 20 % NiO/ZnO/SBA-15 without UV irradiation, (c) 30 % NiO/ZnO/SBA-15, (d) 40 % NiO/ZnO/SBA-15, (e) Degussa P-25, (f) 30 wt% NiO/SBA-15, and (g) 30 wt% ZnO/SBA-15
