Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 22, Issue 16, Pages 12597-12604Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-015-4523-6
Keywords
Biochar; Cd(II)-polluted soil; Cation exchange capacity; Sequential extraction; Soil column leaching
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Funding
- National Natural Science Foundation of China [41271332, 41301339]
- Science and Technology Planning Project of Hunan Province, China [2012SK2021]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2012B138]
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Biochars derived from bamboo, coconut shell, pine wood shavings, and sugarcane bagasse were applied into Ultisol to investigate their effects on Cd(II) immobilization. After 360 days of incubation, the physical/chemical properties of the Ultisol were improved by the addition of different biochars. As a result, the maximum adsorption capacities of soil for Cd(II) were increased from 8.02 to 9.07-11.51 mmol/kg, and bamboo biochar showed the highest effect on Cd(II) immobilization. The Langmuir model (R-2>0.983) fitted the data better than the Freundlich model (R-2 were 0.902-0.937). Column leaching experiments suggested that biochar can also increase the immobilization of Cd(II) under leaching conditions. Biochar mainly increased the weak/unstable binding force of Cd(II) by soil, such as ion exchange, electrostatic attraction, physical adsorption, and carbonate precipitation. In addition, a significant enhancement of surface complexation was also observed.
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