Comparative sorption of Pb and Cd by biochars and its implication for metal immobilization in soils

Park, Jin Hee, Choppala, Girish, Lee, Seul Ji, Bolan, Nanthi, Chung, Jae Woo and Edraki, Mansour (2013) Comparative sorption of Pb and Cd by biochars and its implication for metal immobilization in soils. Water, Air and Soil Pollution, 224 12: 1-12. doi:10.1007/s11270-013-1711-1


Author Park, Jin Hee
Choppala, Girish
Lee, Seul Ji
Bolan, Nanthi
Chung, Jae Woo
Edraki, Mansour
Title Comparative sorption of Pb and Cd by biochars and its implication for metal immobilization in soils
Journal name Water, Air and Soil Pollution   Check publisher's open access policy
ISSN 0049-6979
1573-2932
Publication date 2013-01-01
Sub-type Article (original research)
DOI 10.1007/s11270-013-1711-1
Volume 224
Issue 12
Start page 1
End page 12
Total pages 12
Place of publication Dordrecht, Netherlands
Publisher Springer
Language eng
Subject 2312 Water Science and Technology
2310 Pollution
2305 Environmental Engineering
2304 Environmental Chemistry
2302 Ecological Modelling
Abstract Biochar has great potential as a soil amendment to immobilize heavy metals, thereby reducing their bioavailability. In this study, biochars derived from chicken manure and green waste were compared with commercial activated carbon (AC) and laboratory produced black carbon (BC) for the sorption of Pb and Cd. Sorption kinetics and equilibrium sorption isotherms for Pb and Cd were obtained for the char materials and the data were fitted to kinetic and sorption isotherm models.. Chicken manure-derived biochar (CM) showed the highest sorption capacity for both Pb and Cd, and the Pb sorption by biochars was higher than the Cd sorption because of the precipitation of Pb with various ions released from the biochars such as carbonate, phosphate, and sulfate. The sorption data for both Pb and Cd were better represented by the pseudo-second order kinetic model than the pseudo-first order kinetic model, which indicates chemical sorption between biochar and metals. For the isotherm studies, char materials was mixed with various amount of Pb or Cd solutions and the remaining metal concentration was measured. The equilibrium sorption data followed a Langmuir isotherm with a maximum sorption capacity of 6.8-11 and 1.7-8.0 mg/g by biochars for Pb and Cd, respectively. Furthermore, CM immobilized Pb and Cd up to 93.5 and 88.4 %, respectively, while BC was not effective in the immobilization of Pb in soil. Overall, the sorption experiments in solution and the immobilization experiment in soil showed that biochars are more effective than AC in the sorption of Pb and Cd, and that they have the potential to be used as a soil amendment to remediate metal-contaminated soil.
Keyword Activated carbon
Biochar
Black carbon
Cadmium
Immobilization
Lead
Sorption
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 20 November 2013.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Mined Land Rehabilitation Publications
Official 2014 Collection
 
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