Thermal stability of biochar and its effects on cadmium sorption capacity

Qi, Fangjie and Yan, Yubo and Lamb, Dane and Naidu, Ravi and Bolan, Nanthi S and Liu, Yanju and Ok, Yong Sik and Donne, Scott W. and Semple, Kirk T (2017) Thermal stability of biochar and its effects on cadmium sorption capacity. Bioresource Technology, 246. pp. 48-56. ISSN 0960-8524

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Abstract

In this study, the thermal stability of a wood shaving biochar (WS, 650 °C), a chicken litter biochar (CL, 550 °C) and an activated carbon (AC, 1100 °C) were evaluated by combustion at 375 °C for 24 h to remove the labile non-carbonized organic matter. Results showed that WS and CL biochars were not thermally stable and can lose most of the organic C during combustion. The combusted WS and CL biochars retained considerable amounts of negative charge and displayed higher sorption for Cd (from 5.46 to 68.9 mg/g for WS and from 48.5 to 60.9 mg/g for CL). The AC retained 76.5% of its original C and became more negatively chargely after combustion, but its sorption for Cd slightly decreased (from 18.5 to 14.9 mg/g). This study indicated that after potential burning in wildfires (200 - 500 °C), biochars could have higher sorption capacity for metals by remaining minerals.

Item Type:
Journal Article
Journal or Publication Title:
Bioresource Technology
Additional Information:
This is the author’s version of a work that was accepted for publication in Bioresource Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Bioresource Technology, 246, 2017 DOI: 10.1016/j.biortech.2017.07.033
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2311
Subjects:
ID Code:
87024
Deposited By:
Deposited On:
12 Jul 2017 10:12
Refereed?:
Yes
Published?:
Published
Last Modified:
29 Sep 2020 03:38