Synergistic Remediation of Cd-Contaminated Soil with Pure Natural Adsorption Material and Hyperaccumulator Plant
Jun Guo,
Honggen Xu,
Fengxiang Yin,
Jian Cao,
Xuesheng Xu,
Cong Li,
Fengcun Huang,
Fangwei Chen,
Xiong Mao,
Qi Liao
Affiliations
Jun Guo
Hunan Provincial Key Laboratory of Geochemical Processes and Resource Environmental Effects, Geophysical and Geochemical Survey Institute of Hunan, Changsha 410014, China
Honggen Xu
Changsha General Survey of Natural Resources Centre, China Geological Survey, Changsha 410600, China
Fengxiang Yin
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Jian Cao
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Xuesheng Xu
Hunan Provincial Key Laboratory of Geochemical Processes and Resource Environmental Effects, Geophysical and Geochemical Survey Institute of Hunan, Changsha 410014, China
Cong Li
Changsha General Survey of Natural Resources Centre, China Geological Survey, Changsha 410600, China
Fengcun Huang
Changsha General Survey of Natural Resources Centre, China Geological Survey, Changsha 410600, China
Fangwei Chen
Changsha General Survey of Natural Resources Centre, China Geological Survey, Changsha 410600, China
Xiong Mao
Changsha General Survey of Natural Resources Centre, China Geological Survey, Changsha 410600, China
Qi Liao
Changsha General Survey of Natural Resources Centre, China Geological Survey, Changsha 410600, China
In recent years, cadmium (Cd) contamination in agricultural soil has emerged as a significant global environmental issue, posing irreversible harm to crops and human health. As a result, efficient soil remediation techniques are urgently needed. For this issue, synergistic remediation by material and plant is an effective approach. In this study, a natural and green adsorption material (starch/montmorillonite composite, SMC) of Cd was prepared, which was further employed in synergistic remediation toward soil Cd contamination with the cadmium hyperaccumulator plant Bidens bipinnata. The results of the pot experiment demonstrated that an available Cd removal rate of 77.92 could be obtained, and the results of the field experiments demonstrate that the concentrations of Cd in contaminated soil could be reduced below the risk-screening values for agricultural land. Further analyses, including a microbial community diversity study, changes in soil BCR fraction components, and a TCLP toxicity leaching experiment, unequivocally elucidated that the synergy of SMC and Bidens bipinnata enhanced the remediation efficiency of Cd in contaminated soil. This study confirmed the application potential of the synergy of SMC and Bidens bipinnata toward Cd-contaminated soil.
