2.3. Batch experimental programme
To evaluate the thermodynamic properties, we first prepared
various solutions with initial Pb2+ concentration ranging from
0.1 to 0.8 mM (100 ml, pH 5), and then added 0.2 g FeAA to
each solution. These samples were then mounted on a shaker and
shaken continuously for 48 h at 288, 308 and 318 K, respectively.
The suspensions were filtered using a 0.25 mm membrane, and
the filtrates were immediately measured using an atomic adsorption
spectroscopy (Hitachi Z-6100). 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and 0.8 mM, separately, at 300 ± 1 K. Samples were withdrawn
and filtered using a 0.25 mm 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[22]:
qt = C0 − Ct
mads
, (1)
where C0 and Ct are the Pb2+ concentration in liquid phase at
the initial and any time t (mmol dm−3), respectively, and mads is
the adsorbent amount in the solution (g dm−3).
2.3. Batch experimental programmeTo evaluate the thermodynamic properties, we first preparedvarious solutions with initial Pb2+ concentration ranging from0.1 to 0.8 mM (100 ml, pH 5), and then added 0.2 g FeAA toeach solution. These samples were then mounted on a shaker andshaken continuously for 48 h at 288, 308 and 318 K, respectively.The suspensions were filtered using a 0.25 mm membrane, andthe filtrates were immediately measured using an atomic adsorptionspectroscopy (Hitachi Z-6100). The differences between theinitial and the equilibrium Pb2+ concentrations determine theamount that Pb2+ adsorbed by FeAA.The Adsorption kinetics experiments were performed on JarTest at a constant speed of 150 revolutions per minute (rpm). Thesamples were prepared by adding 5.0 g of FeAA into 1000 mlsolution (pH 5.0), and the Pb2+ concentrations were 0.1, 0.2, 0.4and 0.8 mM, separately, at 300 ± 1 K. Samples were withdrawnand filtered using a 0.25 mm membrane and then analyzed byan atomic adsorption spectroscopy. The amount of sorbed metalper gram of adsorbent qt at time t was calculated as follows[22]:qt = C0 − Ctmads, (1)where C0 and Ct are the Pb2+ concentration in liquid phase atthe initial and any time t (mmol dm−3), respectively, and mads isthe adsorbent amount in the solution (g dm−3).
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