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Remediation of Pb, Cd, and Cu contaminated soil by co-pyrolysis biochar derived from rape straw and orthophosphate: Speciation transformation, risk evaluation and mechanism inquiry.
Sci Total Environ. 2020 Aug 15; 730:139119.ST

Abstract

Biochars are widely used in the remediation of soil heavy metals, but there has been no clear understanding to the effects of novel co-pyrolysis biochars derived from biomass and orthophosphate on soil heavy metals. In this study, co-pyrolysis biochars derived from rape straw and orthophosphate (Ca (H2PO4)2·H2O/KH2PO4) were prepared and used to explore their effects on the speciations and ecological risks of Pb, Cd, and Cu in contaminated agricultural soil. The results showed that the addition of these co-pyrolysis biochars significantly decreased TCLP extracted concentrations (decreased by 5.9-81.7%) and ecological risks of heavy metals (Pb, Cd, and Cu) by transforming the metals from available speciation to stable speciation in soils. Co-pyrolysis biochar derived from rape straw and KH2PO4 showed the highest immobilization capacities, and the immobilization capacities of biochars for three metals were in the order of Pb > Cu > Cd. Co-pyrolysis biochars could precipitate and complex with heavy metals directly by the phosphate and -OH on their surface, and also could promote immobilization of heavy metals indirectly by increasing soil pH value and available P content. During incubation, the content of carboxyl groups on biochars increased significantly, which was beneficial to the further complexation of heavy metals. In summary, the application of co-pyrolysis biochar derived from rape straw and orthophosphate (especially for KH2PO4) could effectively reduce ecological risks of Pb, Cd, and Cu in contaminated soil.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Key Laboratory of Subtropical Agricultural Resource and Environment, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.

Key Laboratory of Subtropical Agricultural Resource and Environment, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.

Key Laboratory of Subtropical Agricultural Resource and Environment, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: fuqingling@mail.hzau.edu.cn.

Key Laboratory of Subtropical Agricultural Resource and Environment, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.

Key Laboratory of Subtropical Agricultural Resource and Environment, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.

Key Laboratory of Subtropical Agricultural Resource and Environment, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.

Key Laboratory of Subtropical Agricultural Resource and Environment, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.

Key Laboratory of Subtropical Agricultural Resource and Environment, Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.

MeSH

CadmiumCharcoalCopperLeadMetals, HeavyPhosphatesPyrolysisSoilSoil Pollutants

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32402973

Citation

Gao, Ruili, et al. "Remediation of Pb, Cd, and Cu Contaminated Soil By Co-pyrolysis Biochar Derived From Rape Straw and Orthophosphate: Speciation Transformation, Risk Evaluation and Mechanism Inquiry." The Science of the Total Environment, vol. 730, 2020, p. 139119.

Gao R, Hu H, Fu Q, et al. Remediation of Pb, Cd, and Cu contaminated soil by co-pyrolysis biochar derived from rape straw and orthophosphate: Speciation transformation, risk evaluation and mechanism inquiry. Sci Total Environ. 2020;730:139119.

Gao, R., Hu, H., Fu, Q., Li, Z., Xing, Z., Ali, U., Zhu, J., & Liu, Y. (2020). Remediation of Pb, Cd, and Cu contaminated soil by co-pyrolysis biochar derived from rape straw and orthophosphate: Speciation transformation, risk evaluation and mechanism inquiry. The Science of the Total Environment, 730, 139119. https://doi.org/10.1016/j.scitotenv.2020.139119

Gao R, et al. Remediation of Pb, Cd, and Cu Contaminated Soil By Co-pyrolysis Biochar Derived From Rape Straw and Orthophosphate: Speciation Transformation, Risk Evaluation and Mechanism Inquiry. Sci Total Environ. 2020 Aug 15;730:139119. PubMed PMID: 32402973.

* Article titles in AMA citation format should be in sentence-case

TY - JOUR T1 - Remediation of Pb, Cd, and Cu contaminated soil by co-pyrolysis biochar derived from rape straw and orthophosphate: Speciation transformation, risk evaluation and mechanism inquiry. AU - Gao,Ruili, AU - Hu,Hongqing, AU - Fu,Qingling, AU - Li,Zhenhua, AU - Xing,Zhiqiang, AU - Ali,Umeed, AU - Zhu,Jun, AU - Liu,Yonghong, Y1 - 2020/04/30/ PY - 2019/12/16/received PY - 2020/04/13/revised PY - 2020/04/28/accepted PY - 2020/5/14/pubmed PY - 2020/6/4/medline PY - 2020/5/14/entrez KW - Heavy metal KW - Immobilization KW - Phosphorus-modified biochar KW - Soil SP - 139119 EP - 139119 JF - The Science of the total environment JO - Sci Total Environ VL - 730 N2 - Biochars are widely used in the remediation of soil heavy metals, but there has been no clear understanding to the effects of novel co-pyrolysis biochars derived from biomass and orthophosphate on soil heavy metals. In this study, co-pyrolysis biochars derived from rape straw and orthophosphate (Ca (H2PO4)2·H2O/KH2PO4) were prepared and used to explore their effects on the speciations and ecological risks of Pb, Cd, and Cu in contaminated agricultural soil. The results showed that the addition of these co-pyrolysis biochars significantly decreased TCLP extracted concentrations (decreased by 5.9-81.7%) and ecological risks of heavy metals (Pb, Cd, and Cu) by transforming the metals from available speciation to stable speciation in soils. Co-pyrolysis biochar derived from rape straw and KH2PO4 showed the highest immobilization capacities, and the immobilization capacities of biochars for three metals were in the order of Pb > Cu > Cd. Co-pyrolysis biochars could precipitate and complex with heavy metals directly by the phosphate and -OH on their surface, and also could promote immobilization of heavy metals indirectly by increasing soil pH value and available P content. During incubation, the content of carboxyl groups on biochars increased significantly, which was beneficial to the further complexation of heavy metals. In summary, the application of co-pyrolysis biochar derived from rape straw and orthophosphate (especially for KH2PO4) could effectively reduce ecological risks of Pb, Cd, and Cu in contaminated soil. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/32402973/Remediation_of_Pb_Cd_and_Cu_contaminated_soil_by_co_pyrolysis_biochar_derived_from_rape_straw_and_orthophosphate:_Speciation_transformation_risk_evaluation_and_mechanism_inquiry_ DB - PRIME DP - Unbound Medicine ER -