The discharge of heavy metals from industrial effluents into
aquatic sources has become a matter of concern over the last few
decades. For the removal lead (II) ions from aqueous solutions
biosorption is a cost effective method especially for the huge
volumes of effluents. In the present study effect of cotton
(Gossypium hirsutum) seed cake biomass on biosorption of lead (II)
from aqueous solutions was deliberated. It was indicated that
adsorption capacity q, (mg/g) and percentage adsorption was
function of biosorbent size, biosorbent dose, pH and initial lead
(II) concentration. Optimized percentage adsorptions were observed
at smaller size of biosorbent 0.355 mm, 0.2 g dose, pH 5.0 and 100
mg/L lead (II) concentration. Kinetic study revealed that
adsorption was rapid in first fifteen minutes and equilibrium was
achieved after six hours. At equilibrium, the maximum metal uptake
was 45.29 mg/g with percentage adsorption 86.68 at pH 5.0. The
Langmuir isotherm model with correlation coefficient (0.93) fitted
well to the data of biosorption of lead (II), corroborating that
the uptake of lead was chemical, saturable and equilibrated
mechanism.
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