Exploring the potential of biochar for the remediation of soils co-contaminated with plastics and cadmium
CAO Yan-xiao1, CHEN Nuo1, XU Xin-yu1, ZHAO Meng-jie1, YANG Jiang-xiu1, WU Jun-feng2, LI Hong-hu1, ZHANG Jing-dong1
1. Research Center for Environment and Health, School of Information Engineering, Zhongnan University of Economics and Law, Wuhan 430073, China; 2. Wuhan Regen Environmental Remediation Co., Ltd, Wuhan 430040, China
Abstract：A 120-day soil incubation experiment was conducted to investigate the effects of rice husk biochar on soil properties and cadmium (Cd) immobilization in polypropylene micro-/macroplastics and Cd co-contaminated soils. The results showed that biochar addition significantly improved soil pH in the co-contaminated soils compared to the control group. It also considerably increased the content of dissolved organic carbon in soils co-contaminated by 7% plastics and Cd. In addition, biochar promoted the conversion of Cd from the active form into relatively stable form in the particulate organic matter and mineral fractions, effectively reducing both the bioavailable Cd content and the proportion of DTPA-extractable Cd (DTPA-Cd) in the co-contaminated soils. Specifically, biochar reduced the bioavailable Cd content by 7.58%~19.71% and the DTPA-Cd proportion by 20.23%~30.83% in microplastics and Cd co-contaminated soils. For macroplastics and Cd co-contaminated soils, the corresponding reductions were 23.80%~28.19% and 21.63%~22.74%, respectively. Notably, the concentration of microplastics was positively correlated with the content of bioavailable Cd, while the concentration of macroplastics showed no significant effect on it. The findings demonstrated that rice husk biochar effectively alleviated the adverse effects of the plastics and Cd co-contamination through improving soil properties, mediating the migration and transformation of Cd among soil solid fractions, as well as adsorbing and immobilizing Cd.
曹艳晓, 陈诺, 徐鑫宇, 赵梦洁, 杨江秀, 吴俊锋, 李鸿鹄, 张敬东. 生物炭修复塑料-镉复合污染土壤潜力与机制[J]. 中国环境科学, 2025, 45(3): 1395-1409.
CAO Yan-xiao, CHEN Nuo, XU Xin-yu, ZHAO Meng-jie, YANG Jiang-xiu, WU Jun-feng, LI Hong-hu, ZHANG Jing-dong. Exploring the potential of biochar for the remediation of soils co-contaminated with plastics and cadmium. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1395-1409.
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