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SEM images. Structural evolution depending on the treatment applied (a) MBM; (b) MBMPYCHAR (UPs); (c) MBMPYCHAR (oxidized); (d) MBMPYCHAR (oxidized; KOH; HCl); (e) MBMPYCHAR (oxidized; KOH; HCl; calcinated); (f) MBMPYCHAR (oxidized; KOH; HCl; calcinated).
