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Impact of green synthesized iron oxide nanoparticles on the distribution and transformation of As species in contaminated soil

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dc.contributor.authorSu, B.
dc.contributor.authorLin, J.
dc.contributor.authorOwens, G.
dc.contributor.authorChen, Z.
dc.date.issued2020
dc.description.abstractIron nanoparticles (Fe NPs) have often been used for in situ remediation of both groundwater and soil. However, the impact of Fe NPs on the distribution and transformation of As species in contaminated soil is still largely unknown. In this study, green iron oxide nanoparticles synthesized using a euphorbia cochinchinensis leaf extract (GION) were used to stabilize As in a contaminated soil. GION exhibited excellent As stabilization effects, where As in non-specifically-bound and specifically-bound fractions decreased by 27.1% and 67.3% after 120 days incubation. While both arsenate (As (V)) and arsenite (As (III)) decreased after GION application, As (V) remained the dominant species in soil. X-ray photoelectron spectroscopy (XPS) confirmed that As (V) was the dominant species in specifically-bound fractions, while As (III) was the dominant species in amorphous and poorly-crystalline hydrous oxides of Fe and Al. Correlation analysis showed that while highly available As fractions were negatively correlated to oxalate and DCB extractable Fe, they were positively correlated to Fe<sup>2+</sup> content, which indicated that Fe cycling was the main process influencing changes in As availability. X-ray fluorescence (XRF) spectroscopy also showed that the Fe<sub>2</sub>O<sub>3</sub> content increased by 47.9% following GION soil treatments. Overall, this work indicated that As would be transformed to more stable fractions during the cycling of Fe following GION application and that the application of GION, even in small doses, provides a low-cost and ecofriendly method for the stabilization of As in soil.
dc.identifier.citationEnvironmental Pollution, 2020; 258(113668)
dc.identifier.doi10.1016/j.envpol.2019.113668
dc.identifier.issn0269-7491
dc.identifier.issn1873-6424
dc.identifier.orcidOwens, G. [0000-0002-4606-3678]
dc.identifier.urihttps://hdl.handle.net/11541.2/140749
dc.language.isoen
dc.publisherELSEVIER SCI LTD
dc.relation.fundingNational Natural Science Foundation of China 41977106
dc.relation.fundingNatural Science Foundation of Fujian Province of China 2019J01287
dc.rightsCopyright 2019 Elsevier
dc.source.urihttps://doi.org/10.1016/j.envpol.2019.113668
dc.subjectArsenic
dc.subjectFerric Compounds
dc.subjectSoil
dc.subjectSoil Pollutants
dc.subjectEnvironmental Pollution
dc.subjectNanoparticles
dc.subjectGreen Chemistry Technology
dc.titleImpact of green synthesized iron oxide nanoparticles on the distribution and transformation of As species in contaminated soil
dc.typeJournal article
pubs.publication-statusPublished
ror.mmsid9916354105001831

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