Fig. 9From: The impregnation of ZnO onto ZSM-5 derived from red mud for photocatalytic degradation of methylene blueInfluence of the initial MB concentration at (a) 80 mg L− 1, (b) 90 mg L− 1 and (c) 100 mg L− 1 with UV-LED irradiation (I) and without irradiation (N)Back to article page