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SEM images of (a) raw orange peel (OP) and orange peel thermally modified (TMOP) at 500 °C (adapted from [34] with permission from Elsevier), (b) of raw kapok fiber (RKF), pyridine-catalyzed kapok fiber (PAKF), and NBS-catalyzed kapok fiber (NAKF) (adapted from [82] with permission from Elsevier), (c) raw pomelo peel, pomelo sponge aerogels (PSA), and hydrophobic sponge aerogels (HPSA) with MTMS (adapted from [86] with permission from RS).
