Performance and mechanism for cadmium and lead adsorption from water and soil by corn straw biochar

Tong Chi, Jiane Zuo, Fenglin Liu

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Front. Environ. Sci. Eng. ›› 2017, Vol. 11 ›› Issue (2) : 15. DOI: 10.1007/s11783-017-0921-y
RESEARCH ARTICLE

Performance and mechanism for cadmium and lead adsorption from water and soil by corn straw biochar

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Abstract

Corn straw biochar prepared under 400 °C was the best Cd and Pb adsorption capacity

Maximum adsorption capacity of Cd and Pb were 43.48 and 22.73 mg·g1, respectively

The dominant mechanism of Cd and Pb adsorption was precipitation

Biochar could reduce the bioavailability of heavy metals when mixed with soil

Cadmium (Cd) and lead (Pb) in water and soil could be adsorbed by biochar produced from corn straw. Biochar pyrolyzed under 400°C for 2 h could reach the ideal removal efficiencies (99.24% and 98.62% for Cd and Pb, respectively) from water with the biochar dosage of 20 g·L1 and initial concentration of 20 mg·L1. The pH value of 4–7 was the optimal range for adsorption reaction. The adsorption mechanism was discussed on the basis of a range of characterizations, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and Raman analysis; it was concluded as surface complexation with active sorption sites (-OH, -COO-), coordination with π electrons (C= C, C= O) and precipitation with inorganic anions (OH, CO32, SO42) for both Cd and Pb. The sorption isotherms fit Langmuir model rather than Freundlich model, and the saturated sorption capacities for Cd and Pb were 38.91 mg·g1 and 28.99 mg·g1, respectively. When mixed with soil, biochar could effectively increase alkalinity and reduce bioavailability of heavy metals. Thus, biochar derived from corn straw would be a green material for both removal of heavy metals and amelioration of soil.

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Keywords

Corn straw / Biochar / Heavy metals / Sorption isotherm / Bioavailability

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Tong Chi, Jiane Zuo, Fenglin Liu. Performance and mechanism for cadmium and lead adsorption from water and soil by corn straw biochar. Front. Environ. Sci. Eng., 2017, 11(2): 15 https://doi.org/10.1007/s11783-017-0921-y

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Acknowledgements

This research was financially supported by the Major Science and Technology Programs for Water Pollution Control and Management of China (Nos. 2011ZX07301-002 and 2012ZX07205-001).

Electronic Supplementary Material

Supplementary material is available in the online version of this article at http://dx.doi.org/10.1007/s11783-017-0921-y and is accessible for authorized users.

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2017 Higher Education Press and Springer–Verlag Berlin Heidelberg
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