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SEM cross-section images of (a) pure NaAlg on PAN substrate; (b) (c) and (d) MMMs containing g-C3N4 content 2, 3 and 5 wt% with respect to NaAlg. (e–h) Corresponding surface images of (a) to (d), respectively. Reproduced with permission from [51], published by Elsevier, 2015.
