The effect of the amount of adsorbent on the removal of Ni
ions by rice husk is depicted in Table 5 for varied adsorbent
doses of 20, 30, 40, 50 and 60 mg/l. Ni removal using rice husk
increased from 94.885% to 96.954% i.e. with the increase of
the amount of absorbent concentration , while Ni removal
using fly Ash varied from 94.540% to 96.034% (see Figs. 4–
7, Table 7