“…By now, various adsorbents, such as active carbon [ 8 ], multiwalled carbon nanotubes [ 9 ], covalent organic frameworks [ 10 ], metal–organic frameworks [ 11 ], nanoparticles [ 12 , 13 ], melanin-based polymers such polydopamine [ 14 , 15 ], natural polymers (cellulose [ 16 , 17 ], and chitosan [ 18 , 19 ]), among others, have been used for waste remediation. Among them, microcrystalline cellulose (MCC) has many advantages, such as sustainability, hydrophilicity, biodegradability, and easy functionalization, which make it very suitable as an adsorbent substrate [ 17 , 20 , 21 , 22 ].…”