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dc.contributor.authorCao, Benyi
dc.contributor.authorZhang, Yunhui
dc.contributor.authorXu, Jian
dc.contributor.authorAl-Tabbaa, Abir
dc.date.accessioned2022-03-26T00:30:47Z
dc.date.available2022-03-26T00:30:47Z
dc.date.issued2022-07-20
dc.identifier.issn0048-9697
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/335358
dc.description.abstractConventional subsurface barrier materials for contamination containment deteriorate in aggressive environments and only have a limited exchange/adsorption capacity for heavy metals. This study focused on the potential use of superabsorbent polymer (SAP) in soil-cement subsurface barriers for enhanced heavy metal sorption and self-healing. The SAP adsorption results for lead, copper, zinc and nickel were well fitted by the Langmuir model. The SAP had the highest adsorption capacity for lead at 175 mg/g, and plays a key role in the removal of the heavy metals in an acidic environment. In addition, the incorporation of SAP in soil-cement increased the ductility and had negligible adverse effects on mechanical and permeability properties. When cracks propagate in the matrix, the SAP is exposed to the ingress of water and swells, and this swelling reaction seals the cracks. The SAP-containing soil-cement demonstrated enhanced self-healing performance in terms of the recovery of permeability. The uniform dispersion and the 3D network of the SAP were observed using micro-CT scanning, and good bonding and self-healing mechanism were confirmed by SEM-EDX analysis. The results suggest the significant potential for the SAP-based approach for the development of more resilient subsurface barriers with enhanced heavy metal sorption and self-healing.
dc.publisherElsevier BV
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleUse of superabsorbent polymer in soil-cement subsurface barriers for enhanced heavy metal sorption and self-healing.
dc.typeArticle
dc.publisher.departmentDepartment of Engineering
dc.date.updated2022-03-25T12:36:00Z
prism.endingPage154708
prism.number154708
prism.publicationDate2022
prism.publicationNameSci Total Environ
prism.startingPage154708
dc.identifier.doi10.17863/CAM.82790
dcterms.dateAccepted2022-03-16
rioxxterms.versionofrecord10.1016/j.scitotenv.2022.154708
rioxxterms.versionAM
dc.contributor.orcidCao, Benyi [0000-0003-1885-7152]
dc.identifier.eissn1879-1026
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/P02081X/1)
cam.orpheus.success2022-03-25 - Embargo set during processing via Fast-track
cam.depositDate2022-03-25
pubs.licence-identifierapollo-deposit-licence-2-1
pubs.licence-display-nameApollo Repository Deposit Licence Agreement
rioxxterms.freetoread.startdate2023-03-31


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Attribution-NonCommercial-NoDerivatives 4.0 International
Except where otherwise noted, this item's licence is described as Attribution-NonCommercial-NoDerivatives 4.0 International