Micron-engineered phosphorus-rich biochar: A strategy for mitigating metalloid mobility, enhancing bacterial biomass, and improving rice (Oryza sativa L.) quality in antimony mining regions

文献类型： 外文期刊

第一作者： Chen, Hanbo

作者： Chen, Hanbo;Li, Meng;Shan, Shengdao;Li, Jianhong;Li, Jiayi;Li, Jiayi;Fang, Zheng;Wang, Hailong;Sarmah, Ajit K.;Zhang, Xiaokai;Gao, Yurong;Yang, Xing;Liu, Yuxue;Chen, Chongjun

作者机构：

关键词： Ball milling; Biochar modification; Functionalized biochar; Heavy metals; Structural equation model

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 509 卷

页码：

收录情况： SCI

摘要： Soil contamination with arsenic (As) and antimony (Sb) poses significant challenges to agricultural productivity and human health. Developing effective remediation strategies is critical to mitigate these contaminants and ensure sustainable crop production. In this study, three ball-milled phosphorus-rich biochars (BMPBs) were prepared based on biochar-to-ball mass ratios of 1:60 (BMPB-1), 1:80 (BMPB-2), and 1:100 (BMPB-3). The remediation potential of BMPBs in the soil-rice systems contaminated with As and Sb was first assessed. Compared to pristine biochar, BMPBs demonstrated a higher specific surface area (16.7 vs. 66.4-98.1 m2 g-1), enhanced intensity of C-O-C bonds, and introduction of new hydroxyl (-OH) functional groups. BMPB addition decreased the concentration of soil-available As by 21.4 %-25.5 %, while only BMPB-3 treatment reduced soilavailable Sb concentration by 14.4 %. Furthermore, BMPB-3 treatment significantly increased the phospholipid fatty acids (PLFA) concentration of Gram-negative bacteria (67.4 %) and arbuscular mycorrhizal fungi (AMF) (31.3 %), compared to the control. BMPB-3 was the most effective in decreasing As/Sb uptake by plants, which could be attributed to the enhanced formation of iron plaques in rice roots. For instance, BMPB-3 treatment reduced As and Sb accumulation in rice grains by 54.6 % and 61.3 %, respectively. Additionally, all BMPB treatments mitigated oxidative stress in rice roots by reducing malondialdehyde and proline contents due to the activation of catalase and superoxide dismutase activities. Partial least squares path model (PLS-PM) fitting results highlight iron plaques as a crucial factor influencing the bioavailability, translocation, and accumulation of As and Sb within soil-rice systems. The findings demonstrate the potential of BMPB-3 as a promising soil amendment for managing As and Sb contamination, offering a practical solution for improving soil health and crop safety.

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