The calcination of adsorbents at 400-800°C
with their size less than 180 μm was conducted to
study the effect of calcination temperature on the
removal of Cd(II). The experiment was performed
at room temperature, pH 5, initial concentrations
of 100 ppm in 100 ml, and 10 g/l of the adsorbent.
The results are shown in Figure 2. The adsorption
ability or %removal of the adsorbents increased
with increasing calcination temperature. However,
all calcination temperatures from 600-800°C had
%removal more than 99.57% of initial Cd(II)
concentration. Thus, the modified coir pith calcined at
600°C was selected to study on the next other effects.