Inderscience Publishers

Removal of copper and lead ions from aqueous solutions by adsorbent derived from sewage sludge

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Adsorbent prepared from sewage sludge has been used for the adsorption of Cu
2+
and Pb2+ from aqueous solutions. It was noted that an increase in removal efficiency achieved 72% and 56% when agitation time achieved 120 min, and a decrease in the removal efficiency from 81% and 70% to 36% and 40% when the heavy metals initial concentration from 10 mg L
?1
to 80 mg L
?1
for Cu2+ and Pb2+ concentration, the removal efficiency increased with the adsorbent concentration increased. The Langmuir model fitted the experimental data reasonably well. The adsorption capacities achieved 9.737 mg g
?1
and 7.386 mg g
?1
for the Cu2+ and Pb2+, respectively. Desorption studies were performed by using dilute hydrochloric acid. Quantitative recovery of the metal ion is possible. The mechanism of adsorption seems to be ion exchange.

Keywords: sewage sludge, heavy metal ions, adsorption isotherms, desorption, heavy metals, copper ions, lead ions, aqueous solutions, dilute hydrochloric acid

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