The use of sago waste for the sorption of lead and copper

Abstract

Sago processing waste, which is both a waste and a pollutant, was used to adsorb lead and copper ions from solution. The sorption process was examined in terms of its equilibria and its kinetics. The effect of pH, contact time, sorbate concentration, particle size and sorbent mass were also studied. The most effective pH range was found to be 4 to 5.5 for both metals. The equilibrium data for both metals fitted both the Langmuir and the Freundlich models and, based on the Langmuir constants, the sago waste had a greater sorption capacity for lead (46.6 mg/g) than for copper (12.4 mg/g). The kinetic studies showed that the sorption rates could be described better by a second-order expression than by the more commonly applied Lagergren equation. *To whom all correspondence should be addressed.

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