The differences between the
initial and the equilibrium Pb2+ concentrations determine the
amount that Pb2+ adsorbed by FeAA.
The Adsorption kinetics experiments were performed on Jar
Test at a constant speed of 150 revolutions per minute (rpm). The
samples were prepared by adding 5.0 g of FeAA into 1000 ml
solution (pH 5.0), and the Pb2+ concentrations were 0.1, 0.2, 0.4
and 0.8 mM, separately, at 300±1K. Samples were withdrawn
and filtered using a 0.25mm membrane and then analyzed by
an atomic adsorption spectroscopy. The amount of sorbed metal
per gram of adsorbent qt at time t was calculated as follows