EDTAD is a biodegradable and active agent containing two
anhydride groups per molecule that can be used to introduce chelating
abilities to the lignocellulosic materials through esterification
reaction. This reaction allows introducing carboxylic and amine
functional groups that present high ability to form stable complexes
with heavy metal ions. Carboxylic and amine functional groups
are often used as chelating agents with the aim of separating or
concentrating metal ions from aqueous solutions