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Title
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Equilibrium, Kinetic, and Thermodynamic Studies on Biosorption of Cd(II) From Aqueous Solution by Biochar
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Creator
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Moyo Mambo
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Sikwila Thokozani Lindiwe
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Sebata Edith
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Nyamunda Benias Chamunorwa
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Guyo Upenyu
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Abstract
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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 qe (cal) value (17.21 mg g-1 ) closer to the qe (exp) value (18.82 mg g-1 ). The adsorption data conforms best to the Langmuir isotherm as revealed by the lower nonlinear Chi square (v2 ) value of 0.15 and a higher correlation value of 0.98 when compared to the Freundlich with a high v2 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 DG0 , DS0 and DH0 confirmed that the biosorption was feasible, spontaneous, and endothermic. The results obtained suggest that using a lowcost biochar biosorbent for removing trace metals in contaminated water treatment plants may have great ecological and environmental significance.
Keywords: Biosorption Biochar Cd(II) Equilibrium Kinetics Thermodynamics
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Date
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2016
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Source
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Research on Chemical Intermediates
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identifier
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DOI 10.1007/s11164-015-2089-z
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volume
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42
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pages
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1349-1362
