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    Foam-Assisted Delivery of Nanoscale Zero Valent Iron in Porous Media

    Source: Journal of Environmental Engineering:;2013:;Volume ( 139 ):;issue: 009
    Author:
    Yuanzhao Ding
    ,
    Bo Liu
    ,
    Xin Shen
    ,
    Lirong Zhong
    ,
    Xiqing Li
    DOI: 10.1061/(ASCE)EE.1943-7870.0000727
    Publisher: American Society of Civil Engineers
    Abstract: Foam is potentially a promising vehicle to deliver nanoparticles for vadose-zone remediation because foam can overcome the intrinsic problems associated with solution-based delivery, such as preferential flow and contaminant mobilization and spreading. In this work, the feasibility of using foam to deliver nanoscale zero valent iron (nZVI) in unsaturated porous media was investigated. Foam generated using the surfactant sodium lauryl ether sulfate (SLES) showed excellent ability to carry nZVI. SLES and nZVI concentrations in the foaming solutions did not affect the percentages of nZVI concentrations in foam relative to nZVI concentrations in the solutions. When foams carrying nZVI were injected through the unsaturated columns, the fractions of nZVI exiting the column were much higher than those when nZVI was injected with liquid. The enhanced nZVI transport implies that foam delivery could significantly increase the radius of influence of injected nZVI. The type and concentrations of surfactants and the influent nZVI concentrations did not noticeably affect nZVI transport during foam delivery. In contrast, nZVI retention increased considerably as the grain size of porous media decreased. Oxidation of foam-delivered nZVI due to oxygen diffusion into unsaturated porous media was visually examined in flow cell texts. It was demonstrated that if foam is injected to cover a deep vadose-zone layer, oxidation would only cause a small fraction of foam-delivered nZVI to be oxidized before it reacts with contaminants.
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      Foam-Assisted Delivery of Nanoscale Zero Valent Iron in Porous Media

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    contributor authorYuanzhao Ding
    contributor authorBo Liu
    contributor authorXin Shen
    contributor authorLirong Zhong
    contributor authorXiqing Li
    date accessioned2017-05-08T21:42:35Z
    date available2017-05-08T21:42:35Z
    date copyrightSeptember 2013
    date issued2013
    identifier other%28asce%29ee%2E1943-7870%2E0000735.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/60182
    description abstractFoam is potentially a promising vehicle to deliver nanoparticles for vadose-zone remediation because foam can overcome the intrinsic problems associated with solution-based delivery, such as preferential flow and contaminant mobilization and spreading. In this work, the feasibility of using foam to deliver nanoscale zero valent iron (nZVI) in unsaturated porous media was investigated. Foam generated using the surfactant sodium lauryl ether sulfate (SLES) showed excellent ability to carry nZVI. SLES and nZVI concentrations in the foaming solutions did not affect the percentages of nZVI concentrations in foam relative to nZVI concentrations in the solutions. When foams carrying nZVI were injected through the unsaturated columns, the fractions of nZVI exiting the column were much higher than those when nZVI was injected with liquid. The enhanced nZVI transport implies that foam delivery could significantly increase the radius of influence of injected nZVI. The type and concentrations of surfactants and the influent nZVI concentrations did not noticeably affect nZVI transport during foam delivery. In contrast, nZVI retention increased considerably as the grain size of porous media decreased. Oxidation of foam-delivered nZVI due to oxygen diffusion into unsaturated porous media was visually examined in flow cell texts. It was demonstrated that if foam is injected to cover a deep vadose-zone layer, oxidation would only cause a small fraction of foam-delivered nZVI to be oxidized before it reacts with contaminants.
    publisherAmerican Society of Civil Engineers
    titleFoam-Assisted Delivery of Nanoscale Zero Valent Iron in Porous Media
    typeJournal Paper
    journal volume139
    journal issue9
    journal titleJournal of Environmental Engineering
    identifier doi10.1061/(ASCE)EE.1943-7870.0000727
    treeJournal of Environmental Engineering:;2013:;Volume ( 139 ):;issue: 009
    contenttypeFulltext
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