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dc.contributor.authorWang, Guiyin
dc.contributor.authorPan, Xiaomei
dc.contributor.authorZhang, Shirong
dc.contributor.authorZhong, Qinmei
dc.contributor.authorZhou, Wei
dc.contributor.authorZhang, Xiaohong
dc.contributor.authorWu, Jun
dc.contributor.authorVijver, Martina G
dc.contributor.authorPeijnenburg, Willie J G M
dc.date.accessioned2020-07-10T12:01:27Z
dc.date.available2020-07-10T12:01:27Z
dc.date.issued2020-04-19
dc.identifier.issn1096-0953
dc.identifier.pmid32344210
dc.identifier.doi10.1016/j.envres.2020.109554
dc.identifier.urihttp://hdl.handle.net/10029/623917
dc.description.abstractBiodegradable chelators (BCs) are promising substitutes for conventional washing agents in the remediation of heavy metal contaminated soil with strong complexing ability and less cost. However, great challenges for the applications of BC-assisted washing still exist, such as the assessment of the factor affecting the efficiency of metal removal and the unclear of the metal removal mechanism. Batch washing was therefore explored to evaluate the potential for four BCs for removing Cd, Pb, and Zn from polluted soils. The soil spectroscopic characteristics before and after washing were also investigated. The results demonstrated that iminodisuccinic acid (ISA) and glutamate-N, N-diacetic acid (GLDA) were an appealing alternative to commonly used non-biodegradable ethylenediaminetetraacetic acid, but glucomonocarbonic acid (GCA) and polyaspartic acid (PASP) were less efficient. Optimal parameters of BCs were determined to be a concentration of 50 mmol L-1, a pH of 5.0, a contact time of 120 min, and a solid/liquid ratio of 1:5, considering metal removal efficiencies and the suitable cost. A single removal washing could be up to 52.39% of Cd, 71.79% of Pb, and 34.13% of Zn from mine soil, and 98.28% of Cd, 91.10% of Pb, and 90.91% of Zn from polluted farmland soil. After washing, the intensity of heavy metal binding to soil colloids increased while the metal mobility reduced because of weakly bound fractions removed by BCs. The BCs-induced soil washing revealed that the possible mechanisms of metal removal included the acid dissolution, ion exchange, and surface complexation. Our findings highlight the potential application of especially ISA and GLDA as efficient washing agents to remove potentially toxic elements from contaminated soils.en_US
dc.language.isoenen_US
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectBiodegradable chelatoren_US
dc.subjectContaminated soilen_US
dc.subjectHeavy metalen_US
dc.subjectSoil washingen_US
dc.subjectSpectroscopic analysisen_US
dc.titleRemediation of heavy metal contaminated soil by biodegradable chelator-induced washing: Efficiencies and mechanisms.en_US
dc.typeArticleen_US
dc.identifier.journalEnviron Res 2020; 186:109554en_US
dc.source.journaltitleEnvironmental research


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