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(a) Reaction scheme of the cationic functionalization of cellulose nanofibers (CNF); (b) SEM micrographs of the cationic CNF; scale bar is 4 µm; (c) photograph showing (right) a brown solution of humic acid at 13 mg/L, and (left) the adsorption of humic acid by cationic CNF (sediment); (d) Color change as a function of exposure time due to methylene blue uptake by the CNF/humic acid system. Adapted with permission from [78].
