Abstract
The removal of lead (II) ions from aqueous solutions was carried out using an activated carbon prepared from a waste biomass. The effects of various parameters such as pH, contact time, initial concentration of lead (II) ions, and temperature on the adsorption process were investigated. Energy Dispersive X-Ray Spectroscopy (EDS) analysis after adsorption reveals the accumulation of lead (II) ions onto activated carbon. The Langmuir and Freundlich isotherm models were applied to analyze equilibrium data. The maximum monolayer adsorption capacity of activated carbon was found to be 476.2 mg g−1. The kinetic data were evaluated and the pseudo-second-order equation provided the best correlation. Thermodynamic parameters suggest that the adsorption process is endothermic and spontaneous.
Highlights
The use of various adsorbents for the removal of heavy metal ions from aqueous solution is of great interest due to environmental concerns
We describe our efforts to remove lead (II) ions from aqueous solution by using the activated carbon produced from soybean oil cake with chemical activation
The effect of pH on the lead (II) ion adsorption capacity of SAC2 was studied at 300 mg L−1 initial lead (II) ion concentration and at 298.15 K
Summary
The use of various adsorbents for the removal of heavy metal ions from aqueous solution is of great interest due to environmental concerns. Activated carbons are widely used for the removal of heavy metal ions from aqueous solution [3,4,5]. The preparation of granular activated carbon (GAC) from agricultural byproducts and their use in adsorption experiments were reported by Johns et al [3]. It was reported that activated carbons showed higher adsorption capacity than the ion-exchange resin [5]. We describe our efforts to remove lead (II) ions from aqueous solution by using the activated carbon produced from soybean oil cake with chemical activation. An agricultural byproduct, was used for the preparation of the activated carbon. The kinetic model for lead (II) adsorption onto the activated carbon was studied
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