Researchers focus on green synthesis sorbent from natural
polymers which can be derived from non-living biomass such as
bark, shell, algal biomass and microbial biomass such as bacteria
and fungi (Apiratikul & Pavasant, 2008; Rozaini et al., 2010;
Singanan & Peters, 2013; Zhang, Wang, Zhang, & Xia, 2014).