Innovative application of recyclable magnetic LDO beads for enhancing the remediation of Cd and Pb contamination and the humification during composting
文献类型： 外文期刊
作者： Jiang, Hongjuan 1 ; Yi, Zhigang 1 ; Chen, Yaoning 1 ; Li, Yuanping 3 ; Zhao, Mengyang 1 ; Wang, Jun 1 ; Liu, Yihuan 4 ; Jia, Xuyang 1 ; Luo, Mengwei 1 ; Nie, Yaoqin 1 ; Chi, Nianping 3 ;
作者机构： 1.Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China
2.Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Peoples R China
3.Hunan City Univ, Sch Municipal & Geomat Engn, Yiyang 413000, Hunan, Peoples R China
4.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizer, State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou 310021, Peoples R China
关键词： LDO; Composting; Heavy metals; Agricultural wastes; Humic substances
期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）
ISSN： 0304-3894
年卷期： 2025 年 495 卷
页码：
收录情况： SCI
摘要： This study developed recyclable magnetic layered double oxide beads (Mag-LDO) for composting with heavy metal-contaminated soil and agricultural waste, aiming to reduce heavy metals (HMs) concentration and bioavailable forms, enhance humification, and elucidate the underlying mechanisms. Results showed that a 5 % addition of Mag-LDO increased humic acid (HA) formation by 16.02 % and significantly reduced total Cd and Pb by 18.38 % and 21.93 %, respectively, compared to the control group. Moreover, it effectively reduced BF-Cd and BF-Pb by 16.31 % and 10.37 %, respectively. These results demonstrated its potential for enhancing humification and remediating HM-contaminated soil. The analysis of microbial community and Mantel-test showed that Mag-LDO facilitated the formation of HA mainly by modulating the microbial community. Meantime, MagLDO not only adsorbed Pb and Cd via ion exchange and precipitation processes to reduce the mobile forms of these metals, but also enhanced the stabilized state of HMs through increasing HA in compost and proliferating Bacillus and Pseudomonas. Furthermore, recovering the Mag-LDO adsorbed HMs could decrease the total HM content in the compost. These findings contribute to advancing new perspectives for the HMs removal and the promotion of humification during composting.
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