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Enhanced remediation of cadmium-contaminated farmland by smooth vetch (Vicia villosa var.) coupled with phosphorus/sulfur co-doped biochar: Synergetic performance and mechanism

文献类型： 外文期刊

作者： Bi, Fuxuan 1 ; Jiang, Zhao 1 ; Wang, Mengning 1 ; Lin, Qiutong 1 ; Liu, Xiaoyang 1 ; Fu, Libo 2 ; Fan, Hongli 3 ; Cao, Weidong 3 ; Qu, Jianhua 1 ; Zhang, Ying 1 ;

作者机构： 1.Northeast Agr Univ, Sch Resources & Environm, Harbin 150030, Peoples R China

2.Yunnan Acad Agr Sci, Inst Agr Environm & Resources, Kunming 650051, Peoples R China

3.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

关键词： P/S co-doped; Biochar; Smooth vetch; Cadmium; Synergistic remediation

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：10.0； 五年影响因子：10.7 ）

ISSN： 0959-6526

年卷期： 2025 年 496 卷

页码：

收录情况： SCI

摘要： Herein, phosphorus/sulfur co-doped biochar (P/S-BC) coupled with smooth vetch (SV) as an innovative remediation strategy was proposed for the remediation of Cd-contaminated farmland. P/S-BC showed a high adsorption performance for Cd(II) and strong tolerance for the change of environmental pH, and the maximum uptake amount reached 204.26 mg/g. Furthermore, the bioavailability of Cd was significantly reduced by 37.27% with addition of 1.0% P/S-BC into soil for 20 days. Noticeably, when crushed fresh SV and 1.0% P/S-BC were applied to soil, the bioavailability of Cd in soil descended by 58.01%, meanwhile, the contents of soil organic matter (SOM) and available phosphorus (AP) in soil increased sharply, thereby improving the soil fertility. This double improvement was owing to that the application of P/S-BC could release more P through the action of organic acids produced by the decomposition of SV, which further bound with Cd to form stable compounds. The synergistic passivation mechanisms of SV + P/S-BC on Cd were surface chelation, precipitation, pore filling, and electrostatic interaction. Overall, this study proposed a promising strategy for achieving simultaneous remediation of heavy metals and supplement of nutrient to soil using heteroatom doped biochar coupled with green fertilizer.

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