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A STUDY OF CADMIUM REMEDIATION AND MECHANISMS: IMPROVEMENTS IN THE STABILITY OF WALNUT SHELL-DERIVED BIOCHAR
Qiu, Z., J. Chen, J. Tang, and Q. Zhang.
Science of the Total Environment 636:80-84(2018)
Biochar prepared using walnut shell was incubated in Cd(NO3)2 and kaolin for 15 days. Different chemical forms of Cd in kaolin and biochar were determined, and the stability of biochar was evaluated by R50 using TGA analysis. Walnut shell-derived biochar was able to reduce Cd mobility. After incubation, the R50, biochar value increased from 61.31% to 69.57%-72.24%. Mechanisms that initiated improvements in biochar stability were investigated by XPS, XRD, and SEM-EDS analysis. Enhanced biochar stability is likely due to physical isolation and the formation of precipitates and complexes formed on the surface or interior of the biochar.
Science of the Total Environment 636:80-84(2018)
Biochar prepared using walnut shell was incubated in Cd(NO3)2 and kaolin for 15 days. Different chemical forms of Cd in kaolin and biochar were determined, and the stability of biochar was evaluated by R50 using TGA analysis. Walnut shell-derived biochar was able to reduce Cd mobility. After incubation, the R50, biochar value increased from 61.31% to 69.57%-72.24%. Mechanisms that initiated improvements in biochar stability were investigated by XPS, XRD, and SEM-EDS analysis. Enhanced biochar stability is likely due to physical isolation and the formation of precipitates and complexes formed on the surface or interior of the biochar.
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