is a natural adsorbent due to the p

is a natural adsorbent due to the presence of the amine
(-NH2
) and hydroxyl (-OH) groups and serve as the
adsorption sites for many adsorbates (Ngah et al.,
2011; Zou et al., 2011; Lin and Zhan, 2012). However,
chitosan is soft and soluble in weak organic acid and
other acidic media which renders it unsuitable for
adsorbing in an acidic environment (Zhang and Bai,