title: Remediation of lead contaminated soil by biochar-supported nano-hydroxyapatite.
abstract: In this study, a high efficiency and low cost biochar-supported nano-hydroxyapatite (nHAP@BC) material was used in the remediation of lead (Pb)-contaminated soil. The remediation effect of nHAP@BC on Pb-contaminated soil was evaluated through batch experiments. The stability, bioaccessibility of Pb in the soil and the change in soil characteristics are discussed. Furthermore, the effects of the amendments on the growth of cabbage mustard seedlings and the accumulation of Pb were studied. The results showed that the immobilization rates of Pb in the soil were 71.9% and 56.8%, respectively, after a 28 day remediation using 8% nHAP and nHAP@BC materials, and the unit immobilization amount of nHAP@BC was 5.6 times that of nHAP, indicating that nHAP@BC can greatly reduce the cost of remediation of Pb in soil. After the nHAP@BC remediation, the residual fraction Pb increased by 61.4%, which greatly reduced the bioaccessibility of Pb in the soil. Moreover, nHAP@BC could effectively reduce the accumulation of Pb in plants by 31.4%. Overall, nHAP@BC can effectively remediate Pb-contaminated soil and accelerate the recovery of soil fertility.
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China.
authors.forename: Zhangmei
authors.initials: Z
authors.lastname: Yang
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China. Electronic address: Sunmoon124@163.com.
authors.forename: Zhanqiang
authors.initials: Z
authors.lastname: Fang
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China.
authors.forename: Liuchun
authors.initials: L
authors.lastname: Zheng
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Cheng
authors.affiliation: Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China; Department of Science and Environmental Studies, The Hong Kong Institute of Education, Hong Kong 00852, China.
authors.forename: Pokeung Eric
authors.initials: PE
authors.lastname: Tsang
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China.
authors.forename: Jianzhang
authors.initials: J
authors.lastname: Fang
authors.affiliation: Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, AL 36849, USA.
authors.forename: Dongye
authors.initials: D
authors.lastname: Zhao
mesh_terms: D002606:Charcoal / Q000737:chemistry* / Q000493:pharmacokinetics; D017886:Durapatite / Q000737:chemistry* / Q000493:pharmacokinetics; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007854:Lead / Q000737:chemistry* / Q000493:pharmacokinetics; D009149:Mustard Plant / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D053758:Nanoparticles / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry* / Q000493:pharmacokinetics
chemical_list: D012989:Soil Pollutants; C540010:biochar; D002606:Charcoal; D007854:Lead; D017886:Durapatite
keywords: Accumulation; Bioavailability; Lead contaminated soil; Soil properties; Translocation; nHAP@BC