Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Products, effect of UV irradiation, water, and coadsorbed K +

Self-cleaning surfaces containing TiO2 nanoparticles have been postulated to efficiently remove NOx from the atmosphere. However, UV irradiation of NOx adsorbed on TiO2 also was shown to form harmful gas-phase byproducts such as HONO and N2O that may limit their depolluting potential. Ambient pressu...

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Autores principales:	Litter, Marta Irene, Destaillats, Hugo
Publicado:	2013
Materias:	APXPS DeNOx depollution HONO renoxification Byproducts Gas dynamics Nitrogen oxides Pollution control Titanium dioxide X ray photoelectron spectroscopy Depollution Irradiation
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19487185_v4_n3_p536_Rosseler http://hdl.handle.net/20.500.12110/paper_19487185_v4_n3_p536_Rosseler
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_19487185_v4_n3_p536_Rosseler
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spelling	paper:paper_19487185_v4_n3_p536_Rosseler2023-06-08T16:32:33Z Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Products, effect of UV irradiation, water, and coadsorbed K + Litter, Marta Irene Destaillats, Hugo APXPS DeNOx depollution HONO renoxification Byproducts Gas dynamics Nitrogen oxides Pollution control Titanium dioxide X ray photoelectron spectroscopy APXPS DeNOx Depollution HONO renoxification Irradiation Self-cleaning surfaces containing TiO2 nanoparticles have been postulated to efficiently remove NOx from the atmosphere. However, UV irradiation of NOx adsorbed on TiO2 also was shown to form harmful gas-phase byproducts such as HONO and N2O that may limit their depolluting potential. Ambient pressure XPS was used to study surface and gas-phase species formed during adsorption of NO2 on TiO2 and subsequent UV irradiation at λ = 365 nm. It is shown here that NO3 -, adsorbed on TiO2 as a byproduct of NO2 disproportionation, was quantitatively converted to surface NO2 and other reduced nitrogenated species under UV irradiation in the absence of moisture. When water vapor was present, a faster NO 3 - conversion occurred, leading to a net loss of surface-bound nitrogenated species. Strongly adsorbed NO3 - in the vicinity of coadsorbed K+ cations was stable under UV light, leading to an efficient capture of nitrogenated compounds. © 2013 American Chemical Society. Fil:Litter, M.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Destaillats, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19487185_v4_n3_p536_Rosseler http://hdl.handle.net/20.500.12110/paper_19487185_v4_n3_p536_Rosseler
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	APXPS DeNOx depollution HONO renoxification Byproducts Gas dynamics Nitrogen oxides Pollution control Titanium dioxide X ray photoelectron spectroscopy APXPS DeNOx Depollution HONO renoxification Irradiation
spellingShingle	APXPS DeNOx depollution HONO renoxification Byproducts Gas dynamics Nitrogen oxides Pollution control Titanium dioxide X ray photoelectron spectroscopy APXPS DeNOx Depollution HONO renoxification Irradiation Litter, Marta Irene Destaillats, Hugo Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Products, effect of UV irradiation, water, and coadsorbed K +
topic_facet	APXPS DeNOx depollution HONO renoxification Byproducts Gas dynamics Nitrogen oxides Pollution control Titanium dioxide X ray photoelectron spectroscopy APXPS DeNOx Depollution HONO renoxification Irradiation
description	Self-cleaning surfaces containing TiO2 nanoparticles have been postulated to efficiently remove NOx from the atmosphere. However, UV irradiation of NOx adsorbed on TiO2 also was shown to form harmful gas-phase byproducts such as HONO and N2O that may limit their depolluting potential. Ambient pressure XPS was used to study surface and gas-phase species formed during adsorption of NO2 on TiO2 and subsequent UV irradiation at λ = 365 nm. It is shown here that NO3 -, adsorbed on TiO2 as a byproduct of NO2 disproportionation, was quantitatively converted to surface NO2 and other reduced nitrogenated species under UV irradiation in the absence of moisture. When water vapor was present, a faster NO 3 - conversion occurred, leading to a net loss of surface-bound nitrogenated species. Strongly adsorbed NO3 - in the vicinity of coadsorbed K+ cations was stable under UV light, leading to an efficient capture of nitrogenated compounds. © 2013 American Chemical Society.
author	Litter, Marta Irene Destaillats, Hugo
author_facet	Litter, Marta Irene Destaillats, Hugo
author_sort	Litter, Marta Irene
title	Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Products, effect of UV irradiation, water, and coadsorbed K +
title_short	Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Products, effect of UV irradiation, water, and coadsorbed K +
title_full	Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Products, effect of UV irradiation, water, and coadsorbed K +
title_fullStr	Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Products, effect of UV irradiation, water, and coadsorbed K +
title_full_unstemmed	Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Products, effect of UV irradiation, water, and coadsorbed K +
title_sort	chemistry of nox on tio2 surfaces studied by ambient pressure xps: products, effect of uv irradiation, water, and coadsorbed k +
publishDate	2013
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19487185_v4_n3_p536_Rosseler http://hdl.handle.net/20.500.12110/paper_19487185_v4_n3_p536_Rosseler
work_keys_str_mv	AT littermartairene chemistryofnoxontio2surfacesstudiedbyambientpressurexpsproductseffectofuvirradiationwaterandcoadsorbedk AT destaillatshugo chemistryofnoxontio2surfacesstudiedbyambientpressurexpsproductseffectofuvirradiationwaterandcoadsorbedk
_version_	1768544570194264064

Chemistry of NOx on TiO2 surfaces studied by ambient pressure XPS: Products, effect of UV irradiation, water, and coadsorbed K +

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