Equilibrium, kinetic, and thermodynamic studies on biosorption of Cd(II) from aqueous solution by biochar

Equilibrium, kinetic, and thermodynamic studies on biosorption of Cd(II) from aqueous solution by... The present investigation describes the use of biochar derived from an agricultural waste: the maize cob for the biosorption of Cd(II) ion. The biochar was characterized using scanning electron microscopy, surface area analysis, and Fourier transform infra-red spectroscopy. Batch experiments were performed to investigate the effects of parameters such as pH (2.0–8.0), dosage (0.2–1.2 g), contact time (5–300 min), initial metal concentration (10–100 mg L−1), and temperature (20–50 °C). Kinetic data were properly fitted with the pseudo-second-order model, with the q e (cal) value (17.21 mg g−1) closer to the q e (exp) value (18.82 mg g−1). The adsorption data conforms best to the Langmuir isotherm as revealed by the lower non-linear Chi square (χ 2) value of 0.15 and a higher correlation value of 0.98 when compared to the Freundlich with a high χ 2 value of 2.65 and lower correlation value of 0.96. The maximum adsorption capacity for the biochar was 33.0 mg g−1. The thermodynamic parameters ΔG 0, ΔS 0 and ΔH 0 confirmed that the biosorption was feasible, spontaneous, and endothermic. The results obtained suggest that using a low-cost biochar biosorbent for removing trace metals in contaminated water treatment plants may have great ecological and environmental significance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Equilibrium, kinetic, and thermodynamic studies on biosorption of Cd(II) from aqueous solution by biochar

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Publisher
Springer Netherlands
Copyright
Copyright © 2015 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-015-2089-z
Publisher site
See Article on Publisher Site

Abstract

The present investigation describes the use of biochar derived from an agricultural waste: the maize cob for the biosorption of Cd(II) ion. The biochar was characterized using scanning electron microscopy, surface area analysis, and Fourier transform infra-red spectroscopy. Batch experiments were performed to investigate the effects of parameters such as pH (2.0–8.0), dosage (0.2–1.2 g), contact time (5–300 min), initial metal concentration (10–100 mg L−1), and temperature (20–50 °C). Kinetic data were properly fitted with the pseudo-second-order model, with the q e (cal) value (17.21 mg g−1) closer to the q e (exp) value (18.82 mg g−1). The adsorption data conforms best to the Langmuir isotherm as revealed by the lower non-linear Chi square (χ 2) value of 0.15 and a higher correlation value of 0.98 when compared to the Freundlich with a high χ 2 value of 2.65 and lower correlation value of 0.96. The maximum adsorption capacity for the biochar was 33.0 mg g−1. The thermodynamic parameters ΔG 0, ΔS 0 and ΔH 0 confirmed that the biosorption was feasible, spontaneous, and endothermic. The results obtained suggest that using a low-cost biochar biosorbent for removing trace metals in contaminated water treatment plants may have great ecological and environmental significance.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: May 20, 2015

References

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