its unique properties such as biodegradability, biocompatibility and non-toxicity, chitosan has been reported to be widely used in water treatment and purification. The presence of bulky amino and hydroxyl functional groups makes it capable to form complexes with almost all metal ions ( Akolo & Kovo, 2015). However, this biopolymer has severe drawbacks in terms of mechanical strength and solubility in acidic media that limits its performance as sorbent (Laus & Favere, 2011). Chemical crosslinking reaction of chitosan by suitable crosslinking agents such as glutaraldehyde, epichlorohydrin and ethylene glycol diglycidyl was proved to stabilize it in low-pH solution. This reaction, somehow, reduces the sorption capacities of chitosan because the crosslinking agent is usually prone to react with the amine group in chitosan which are known to be the main chelating sites for metal ions. To solve this problem, addition of certain functional group by grafting is necessary after crosslinking and hence, improves the target metal sorption properties