The adsorption and desorption of various dyes could be altered by the amino groups in gelatin molecules [45,46]. The regeneration and reusability of com- posite membranes based on alginate and gelatin were found to be improved by gelatin. The amino groups were protonated in the acidic regeneration media to form –NH+3 groups that resulted in electrostatic repulsions to desorb cationic dye (MB) molecules [47]. A composite aerogel based on alginate-gelatin and graphene oxide that demonstrated good reusable performance with high adsorption capability was recently reported [40]. However, limited research is available regarding alginate-gelatin and activated carbon-based adsorbent beads for cationic dye removal.