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SEM surface micrographs of C60-ZSM-22/PES membrane materials prepared using C60-ZSM-22 as zeolite additives: (a) PES, (b) 0.1 wt.% C60-ZSM-22/PES, (c) 0.3 wt.% C60-ZSM-22/PES, (d) 0.5 wt.% C60-ZSM-22/PES, (e) 0.75 wt.% C60-ZSM-22/PES, and (f) 1.0 wt.% C60-ZSM-22/PES via phase inversion.
