Removal of copper and lead ions from aqueous solutions by adsorbent derived from sewage sludge
by YunBo Zhai; GuangMing Zeng; LaFang Wang; XianXun Wei; CaiTing Li; ShanHong Li
International Journal of Environment and Waste Management (IJEWM), Vol. 8, No. 3/4, 2011

Abstract: Adsorbent prepared from sewage sludge has been used for the adsorption of Cu²⁺ 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.

Online publication date: Sat, 24-Jan-2015

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