Ball-milled sepiolite/phosphate rock for simultaneous remediation of cadmium-contaminated farmland and alleviation of phosphorus deficiency symptoms in pepper

[Display omitted] •Composite mineral (BM-Sep2PR1) is prepared by ball milled sepiolite/phosphate rock.•Addition of BM-Sep2PR1 significantly decreases the bioavailability of Cd in soil.•Application of BM-Sep2PR1 alleviates the phosphorus deficiency symptoms of pepper.•BM-Sep2PR1 enhances abundance of...

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Jg. 488; S. 150925
Hauptverfasser: Qu, Jianhua, Li, Yuhui, Sun, Hebang, Liu, Ruixin, Han, Yue, Bi, Fuxuan, Fan, Hongli, Zhang, Guosheng, Zhang, Yupeng, Wang, Yifan, Cao, Weidong, Zhang, Ying
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier B.V 15.05.2024
Schlagworte:
Ball milling
Cadmium
Passivator
Phosphate rock
Sepiolite
Ball milling
Cadmium
Passivator
Phosphate rock
Sepiolite
ISSN:1385-8947, 1873-3212
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Zusammenfassung:[Display omitted] •Composite mineral (BM-Sep2PR1) is prepared by ball milled sepiolite/phosphate rock.•Addition of BM-Sep2PR1 significantly decreases the bioavailability of Cd in soil.•Application of BM-Sep2PR1 alleviates the phosphorus deficiency symptoms of pepper.•BM-Sep2PR1 enhances abundance of heavy metal-resistant and nutrient cycling bacteria.•BM-Sep2PR1 can convert Cd to such stable forms as Cd3(PO4)2 and CdnCa5-n(PO4)3OH. Herein, ball-milled combination of sepiolite and phosphate rock was carried out for synergistic passivation of Cd in soil and alleviation of phosphorus deficiency in pepper. The as-prepared BM-Sep2PR1 exhibited extensive pH adaptability and fast uptake for Cd(II) with maximal uptake capacity of 78.67 mg/g. After application of 0.5 % BM-Sep2PR1, the bioavailability of Cd in soil decreased by 58.2 %, and its unstable forms declined by 57.0 % with transformation into residual speciation such as Cd3(PO4)2 and CdnCa5-n(PO4)3OH. Moreover, BM-Sep2PR1 significantly decreased the amount of Cd in pepper shoot (77.8 %) and root (54.8 %), and the bioconcentration factors (soil-root) and translocation factors (root-shoot) were significantly reduced by 54.8 % and 50.8 %, respectively. Notably, the soil available phosphorus, pepper root vitality, and photosynthetic pigment content increased by 202.8 %, 136.4 %, and 58.4 %, respectively, thus significantly alleviating the phosphorus deficiency symptoms of pepper. Additionally, BM-Sep2PR1 improved soil microbial community structure, especially enhanced the abundance of microorganism involved in nutrient cycling and heavy metal resistance. The Cd passivation mechanisms of BM-Sep2PR1 were identified as pore filling, electrostatic attraction, ion exchange, surface complexation, and chemical precipitation. Overall, this study provided a potential strategy for synergetic soil remediation and plant nutrient supplement by using ball-milled functional materials.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2024.150925