Research Article
Abstract
The potential of acid modified Vigna subterranean Shell as an eco-friendly adsorbent for the removal of Pb2+ and Cd2+ ions from aqueous solution was investigated in batch experiment. The effect of adsorbate pH was studied between pH 2 - 12 at 298 K. The adsorption thermodynamic was investigated at the range of 40˚C - 80˚C with 50 mL, of each adsorbate solution and the adsorbent dosage from 0.5 g – 2.5 g at 1 h. An optimum adsorption efficiency of 99.784 (%) and 82.260 (%) was achieved for Lead and Cadmium at 298 K respectively. Adsorption isotherms were studied by fitting the results obtained to different isotherm models so as to elucidate the mechanism of interaction between the adsorbent and adsorbate. Results obtained indicated that the Freundlich isotherm model describes the interaction adequately with a R2 values of 0.987 and 0.962 for Lead and Cadmium respectively, indicating a multilayer adsorption mechanism for Lead and Cadmium sorption by the adsorbent. R² values of 0.0800 and 0.0086 were obtained for the pseudo-first-order kinetic model plot, while 0.9999 and 0.9998 R² values were obtained for the pseudo-second-order model plot, an evident that the adsorption process is best described by the Blanchard pseudo-second-order kinetic model, a suggestion that chemisorption dominated the reaction. The positive values (+6.265 and +1.348 kJmol-1) obtained for ΔH0 for both Lead and Cadmium, was an indication of endothermic reaction.
Keywords
Adsorption, wastewater, isotherm, kinetics, Vigna subterranea shell.
References
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Abstract
The potential of acid modified Vigna subterranean Shell as an eco-friendly adsorbent for the removal of Pb2+ and Cd2+ ions from aqueous solution was investigated in batch experiment. The effect of adsorbate pH was studied between pH 2 - 12 at 298 K. The adsorption thermodynamic was investigated at the range of 40˚C - 80˚C with 50 mL, of each adsorbate solution and the adsorbent dosage from 0.5 g – 2.5 g at 1 h. An optimum adsorption efficiency of 99.784 (%) and 82.260 (%) was achieved for Lead and Cadmium at 298 K respectively. Adsorption isotherms were studied by fitting the results obtained to different isotherm models so as to elucidate the mechanism of interaction between the adsorbent and adsorbate. Results obtained indicated that the Freundlich isotherm model describes the interaction adequately with a R2 values of 0.987 and 0.962 for Lead and Cadmium respectively, indicating a multilayer adsorption mechanism for Lead and Cadmium sorption by the adsorbent. R² values of 0.0800 and 0.0086 were obtained for the pseudo-first-order kinetic model plot, while 0.9999 and 0.9998 R² values were obtained for the pseudo-second-order model plot, an evident that the adsorption process is best described by the Blanchard pseudo-second-order kinetic model, a suggestion that chemisorption dominated the reaction. The positive values (+6.265 and +1.348 kJmol-1) obtained for ΔH0 for both Lead and Cadmium, was an indication of endothermic reaction.
Abstract Keywords
Adsorption, wastewater, isotherm, kinetics, Vigna subterranea shell.
This work is licensed under the
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4.0
License (CC BY-NC 4.0).
Editor-in-Chief
This work is licensed under the
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License.(CC BY-NC 4.0).