Initial Pb+2 concentration of 370 mg/L and adsorbent/solution ratio of 5 g/L were also used.
For each time interval, 0.1 g of the adsorbent was added to 20 mL of the Pb+2 solutions in a
50 mL auto-clavable test tube which was then stirred at 150 rpm with a shaking thermostat.
At the completion of each time interval, the tube was picked out from the shaker and the
adsorbent was separated from the solution by the centrifugation at 3000 rpm for 15 min. The
solutions which contained the remains of the Pb+2 after the adsorption process were subjected
to analysis through the AAS technique to determine the adsorbed amount of the Pb+2 through
the difference between its initial (Co) and equilibrium (Ce) concentrations.
Spectrophotometer- Zeenit model 700 Panalytikajena, manufactured in Germany was the
instrument which was utilized for the determination of the lead removal percentage.