Niobium Oxide Photocatalytically Oxidizes Ammonia in Water at Ambient Conditions

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dc.citation.issueNumber4en_US
dc.citation.journalTitleJournal of the Brazilian Chemical Societyen_US
dc.citation.volumeNumber35en_US
dc.contributor.authorElias, Welmanen_US
dc.contributor.authorClark, Chelseaen_US
dc.contributor.authorHeck, Kimberlyen_US
dc.contributor.authorArredondo, Jacoben_US
dc.contributor.authorWang, Boen_US
dc.contributor.authorToro, Andrasen_US
dc.contributor.authorKürtib, Lászlóen_US
dc.contributor.authorWong, Michaelen_US
dc.contributor.orgNanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatmenten_US
dc.date.accessioned2024-05-03T15:51:02Zen_US
dc.date.available2024-05-03T15:51:02Zen_US
dc.date.issued2024en_US
dc.description.abstractAmmonia contamination in water is a significant environmental issue since it is toxic and leads to eutrophication. Photocatalysis has been investigated as a strategy for ammonia degradation but can potentially form toxic nitrite (NO2–) and nitrate (NO3–) byproducts. This work reports on the ability of niobium oxide (Nb2O5) to photocatalytically oxidize aqueous-phase ammonia (NH3). Whereas as-synthesized Nb2O5 showed little catalytic activity (< 1% NH3 conversion after 6 h of UV-C irradiation, at room temperature and atmospheric pressure, and under O2 headspace), Nb2O5 treated in basic solution (OH-Nb2O5) was able to photocatalytically degrade NH3 at ca. 9% conversion after six hours, with ca. 70% selectivity to the desired N2, with a first-order rate constant of ca. 12 times higher than the as synthesize catalyst (1.6 × 10–3 min–1 vs. 2.0 × 10–2 min–1). Raman spectroscopic analysis indicated the presence of terminal Nb=O species after base treatment of Nb2O5, implicating them as catalytically active sites. These results underscore how a simple structural modification can significantly affect photocatalytic activity for aqueous ammonia oxidation.en_US
dc.identifier.citationElias, W. C., Clark, C. A., Heck, K. N., Arredondo, J. H., Wang, B., Toro, A., Kürti, L., & Wong, M. S. (2024). Niobium Oxide Photocatalytically Oxidizes Ammonia in Water at Ambient Conditions. Journal of the Brazilian Chemical Society, 35, https://doi.org/10.21577/0103-5053.20230163en_US
dc.identifier.digitalNiobiumOxideen_US
dc.identifier.doihttps://doi.org/10.21577/0103-5053.20230163en_US
dc.identifier.urihttps://hdl.handle.net/1911/115512en_US
dc.language.isoengen_US
dc.publisherSciELOen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleNiobium Oxide Photocatalytically Oxidizes Ammonia in Water at Ambient Conditionsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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