B. Effect of Agitation Rate on Cu(II) Adsorption
Agitation rate plays an important role in the adsorption
process and the effect of agitation speed on adsorption
capacity of copper has been studied by varying the agitation
speed from 150 – 350 rpm. The copper adsorption percentage
at different agitation speeds by chicken eggshells is shown in
Fig. 2.
It has been observed that the percentage of copper
adsorption increased with increasing agitation speed due to
the proper contact between the metal ions in solution and the
adsorbents binding sites that promotes effective transfer of
copper ions to the adsorbents sites. Results indicated that the
Cu(II) adsorption by chicken eggshells reached almost 100% at
350 rpm. At lower speed, the adsorbent will accumulate at
bottom and result in burial of various active sites under the
above layers of adsorbent [8].