Equilibrium, kinetic, and thermodynamic studies on biosorption of Cd(II) from aqueous solution by biochar
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 pe...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Springer
2016
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| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/s11164-015-2089-z http://hdl.handle.net/11408/1570 |
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| Summary: | 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. |
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