Show simple item record

dc.creatorShumlas, SL
dc.creatorSingireddy, S
dc.creatorThenuwara, AC
dc.creatorAttanayake, NH
dc.creatorReeder, RJ
dc.creatorStrongin, DR
dc.date.accessioned2021-01-25T22:12:39Z
dc.date.available2021-01-25T22:12:39Z
dc.date.issued2016-10-06
dc.identifier.issn1467-4866
dc.identifier.issn1467-4866
dc.identifier.doihttp://dx.doi.org/10.34944/dspace/4991
dc.identifier.otherDX9EV (isidoc)
dc.identifier.other28316506 (pubmed)
dc.identifier.urihttp://hdl.handle.net/20.500.12613/5009
dc.description.abstract© 2016 The Author(s). The effect of simulated solar radiation on the oxidation of arsenite [As(III)] to arsenate [As(V)] on the layered manganese oxide, birnessite, was investigated. Experiments were conducted where birnessite suspensions, under both anoxic and oxic conditions, were irradiated with simulated solar radiation in the presence of As(III) at pH 5, 7, and 9. X-ray absorption spectroscopy (XAS) was used to determine the nature of the adsorbed product on the surface of the birnessite. The oxidation of As(III) in the presence of birnessite under simulated solar light irradiation occurred at a rate that was faster than in the absence of light at pH 5. At pH 7 and 9, As(V) production was significantly less than at pH 5 and the amount of As(V) production for a given reaction time was the same under dark and light conditions. The first order rate constant (kobs) for As(III) oxidation in the presence of light and in the dark at pH 5 were determined to be 0.07 and 0.04 h-1, respectively. The As(V) product was released into solution along with Mn(II), with the latter product resulting from the reduction of Mn(IV) and/or Mn(III) during the As(III) oxidation process. Post-reaction XAS analysis of As(III) exposed birnessite showed that arsenic was present on the surface as As(V). Experimental results also showed no evidence that reactive oxygen species played a role in the As(III) oxidation process.
dc.format.extent5-
dc.language.isoen
dc.relation.haspartGeochemical Transactions
dc.relation.isreferencedbySpringer Science and Business Media LLC
dc.rightsCC BY
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectArsenic remediation
dc.subjectBirnessite
dc.subjectPhotochemistry
dc.subjectAs(III) oxidation
dc.titleOxidation of arsenite to arsenate on birnessite in the presence of light
dc.typeArticle
dc.type.genreJournal Article
dc.relation.doi10.1186/s12932-016-0037-5
dc.ada.noteFor Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.edu
dc.creator.orcidStrongin, Daniel R.|0000-0002-1776-5574
dc.date.updated2021-01-25T22:12:36Z
refterms.dateFOA2021-01-25T22:12:40Z


Files in this item

Thumbnail
Name:
Oxidation of arsenite to arsenate ...
Size:
1.092Mb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record

CC BY
Except where otherwise noted, this item's license is described as CC BY