Red mud-enhanced magnesium phosphate cement for remediation of Pb and As contaminated soil
DC Field | Value | Language |
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dc.contributor.author | Wang, Lei | - |
dc.contributor.author | Chen, Liang | - |
dc.contributor.author | Guo, Binglin | - |
dc.contributor.author | Tsang, Daniel C. W. | - |
dc.contributor.author | Huang, Longbin | - |
dc.contributor.author | Ok, Yong Sik | - |
dc.contributor.author | Mechtcherine, Viktor | - |
dc.date.accessioned | 2021-08-30T06:04:06Z | - |
dc.date.available | 2021-08-30T06:04:06Z | - |
dc.date.created | 2021-06-18 | - |
dc.date.issued | 2020-12-05 | - |
dc.identifier.issn | 0304-3894 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/50845 | - |
dc.description.abstract | Lead (Pb) and arsenic (As) contaminated soil poses severe threats to human health. This study proposes a novel approach for synchronous stabilisation/solidification (S/S) of Pb and As contaminated soil and explains the immobilisation mechanisms in red mud-modified magnesium phosphate cement (MPC). Experimental results show that incorporation of red mud in MPC binder retarded over-rapid reaction and enhanced compressive strength via the formation of (Al,Fe,K)PO4 center dot nH(2)O compounds as indicated by X-ray diffractometer (XRD) and elemental mapping. The presence of Pb had a marginal effect on the MPC reaction; however, the presence of As suppressed the generation of MgKPO4 center dot 6H(2)O, leading to a significant delay of setting time and a reduction of compressive strength. Extended X-ray absorption fine structure (EXAFS) analysis proved that Pb2+ strongly coordinated with the PO43-, whereas AsO2- gently coordinated with K+. The MPC binder displayed an excellent immobilisation efficiency for Pb (99.9%), but was less effective for As. The use of red mud enhanced the As immobilisation efficacy to 80.5% due to strong complexation between AsO2- and Fe3+. The treated soils fulfilled requirements of metal(loid) leachability and mechanical strength for on-site reuse. Therefore, red mud-modified MPC can be an effective binder for sustainable remediation of Pb and As contaminated soil. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER | - |
dc.subject | LEACHING BEHAVIORS | - |
dc.subject | LEAD | - |
dc.subject | STABILIZATION/SOLIDIFICATION | - |
dc.subject | IRON | - |
dc.subject | WASTE | - |
dc.subject | IMMOBILIZATION | - |
dc.subject | MECHANISM | - |
dc.subject | MINERALS | - |
dc.subject | METALS | - |
dc.subject | MGO | - |
dc.title | Red mud-enhanced magnesium phosphate cement for remediation of Pb and As contaminated soil | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Ok, Yong Sik | - |
dc.identifier.doi | 10.1016/j.jhazmat.2020.123317 | - |
dc.identifier.scopusid | 2-s2.0-85087421320 | - |
dc.identifier.wosid | 000571407100002 | - |
dc.identifier.bibliographicCitation | JOURNAL OF HAZARDOUS MATERIALS, v.400 | - |
dc.relation.isPartOf | JOURNAL OF HAZARDOUS MATERIALS | - |
dc.citation.title | JOURNAL OF HAZARDOUS MATERIALS | - |
dc.citation.volume | 400 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Engineering | - |
dc.relation.journalResearchArea | Environmental Sciences & Ecology | - |
dc.relation.journalWebOfScienceCategory | Engineering, Environmental | - |
dc.relation.journalWebOfScienceCategory | Environmental Sciences | - |
dc.subject.keywordPlus | LEACHING BEHAVIORS | - |
dc.subject.keywordPlus | LEAD | - |
dc.subject.keywordPlus | STABILIZATION/SOLIDIFICATION | - |
dc.subject.keywordPlus | IRON | - |
dc.subject.keywordPlus | WASTE | - |
dc.subject.keywordPlus | IMMOBILIZATION | - |
dc.subject.keywordPlus | MECHANISM | - |
dc.subject.keywordPlus | MINERALS | - |
dc.subject.keywordPlus | METALS | - |
dc.subject.keywordPlus | MGO | - |
dc.subject.keywordAuthor | Contaminated soil remediation | - |
dc.subject.keywordAuthor | Potentially toxic elements | - |
dc.subject.keywordAuthor | Arsenic/lead leachability | - |
dc.subject.keywordAuthor | Stabilization/solidification | - |
dc.subject.keywordAuthor | Sustainable waste management | - |
dc.subject.keywordAuthor | Synchrotron analysis | - |
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