TY - JOUR
T1 - A study of cadmium remediation and mechanisms
T2 - Improvements in the stability of walnut shell-derived biochar
AU - Qiu, Zhen
AU - Chen, Jinhuan
AU - Tang, Jiawen
AU - Zhang, Qiuzhuo
N1 - Publisher Copyright:
© 2018
PY - 2018/9/15
Y1 - 2018/9/15
N2 - Biochar has been recognized as an efficient soil amendment for cadmium remediation in recent years. In the present study, biochar was prepared using walnut shell, and it was incubated in Cd(NO3)2 and kaolin for 15 days. Different chemical forms of cadmium in kaolin and biochar were determined, and the stability of biochar was evaluated by R50 using TGA analysis. It was found that walnut shell derived biochar could reduce the mobility of cadmium. After incubation, the R50, biochar value increased from 61.31% to 69.57%–72.24%, indicating that the stability of biochar was improved. The mechanisms that initiated improvements in biochar stability were investigated by XPS, XRD and SEM-EDS analysis. The result showed that the 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. The results suggested that walnut shell-derived biochar can be used as a cadmium sorbent for soil remediation.
AB - Biochar has been recognized as an efficient soil amendment for cadmium remediation in recent years. In the present study, biochar was prepared using walnut shell, and it was incubated in Cd(NO3)2 and kaolin for 15 days. Different chemical forms of cadmium in kaolin and biochar were determined, and the stability of biochar was evaluated by R50 using TGA analysis. It was found that walnut shell derived biochar could reduce the mobility of cadmium. After incubation, the R50, biochar value increased from 61.31% to 69.57%–72.24%, indicating that the stability of biochar was improved. The mechanisms that initiated improvements in biochar stability were investigated by XPS, XRD and SEM-EDS analysis. The result showed that the 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. The results suggested that walnut shell-derived biochar can be used as a cadmium sorbent for soil remediation.
KW - Biochar
KW - Cadmium
KW - Kaolin
KW - Walnut shell
UR - https://www.scopus.com/pages/publications/85046124613
U2 - 10.1016/j.scitotenv.2018.04.215
DO - 10.1016/j.scitotenv.2018.04.215
M3 - 文章
C2 - 29704719
AN - SCOPUS:85046124613
SN - 0048-9697
VL - 636
SP - 80
EP - 84
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -