Photostimulated oxygen isotope exchange between N^sup 18^O and anatase TiO^sub 2^ under light irradiation
It is known that an intense photoinduced oxygen isotope heteroexchange (POIEx) between N18O and TiO2 occurs via interaction of N18O with surface hole center 16Ocus-, where 16Ocus- is coordinatively unsaturated surface oxygen captured a photogenerated hole. At the same time the mechanism of formation...
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| Veröffentlicht in: | Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2017-01, Vol.332, p.554 |
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| creator | Mikhaylov, Ruslan V Glazkova, Nadezhda I Nikitin, Konstantin V |
| description | It is known that an intense photoinduced oxygen isotope heteroexchange (POIEx) between N18O and TiO2 occurs via interaction of N18O with surface hole center 16Ocus-, where 16Ocus- is coordinatively unsaturated surface oxygen captured a photogenerated hole. At the same time the mechanism of formation of N18O-16Ocus- intermediate has not been investigated. Formation of the intermediate may occur via either a collision of the gaseous NO molecules with the 16Ocus- centers or a contact of weakly adsorbed NO species with the ones. The present work is devoted to the investigation of POIEx between N18O and TiO2 Hombifine N (anatase) at T = 293 K by means of kinetic mass-spectrometry and temperature-programmed desorption (TPD) spectroscopy. From the linear dependence of the POIEx rate on N18O pressure it was shown that the exchange occurs via the collision interaction of gaseous NO molecule with the surface active site 16Ocus-. The activation energy (Ea = 0.221 ±0.003 eV) of oxygen exchange step image was calculated basing on the dependence of the exchange rate on the temperature in the 150-300 K range. |
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At the same time the mechanism of formation of N18O-16Ocus- intermediate has not been investigated. Formation of the intermediate may occur via either a collision of the gaseous NO molecules with the 16Ocus- centers or a contact of weakly adsorbed NO species with the ones. The present work is devoted to the investigation of POIEx between N18O and TiO2 Hombifine N (anatase) at T = 293 K by means of kinetic mass-spectrometry and temperature-programmed desorption (TPD) spectroscopy. From the linear dependence of the POIEx rate on N18O pressure it was shown that the exchange occurs via the collision interaction of gaseous NO molecule with the surface active site 16Ocus-. The activation energy (Ea = 0.221 ±0.003 eV) of oxygen exchange step image was calculated basing on the dependence of the exchange rate on the temperature in the 150-300 K range.</description><identifier>ISSN: 1010-6030</identifier><identifier>EISSN: 1873-2666</identifier><language>eng</language><publisher>Lausanne: Elsevier BV</publisher><subject>Anatase ; Collision dynamics ; Irradiation ; Isotopes ; Light irradiation ; Nitric oxide ; Oxygen ; Oxygen exchange ; Photocatalysis ; Radiation ; Spectrometry ; Spectroscopy ; Temperature ; Titanium dioxide</subject><ispartof>Journal of photochemistry and photobiology. 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A, Chemistry.</title><description>It is known that an intense photoinduced oxygen isotope heteroexchange (POIEx) between N18O and TiO2 occurs via interaction of N18O with surface hole center 16Ocus-, where 16Ocus- is coordinatively unsaturated surface oxygen captured a photogenerated hole. At the same time the mechanism of formation of N18O-16Ocus- intermediate has not been investigated. Formation of the intermediate may occur via either a collision of the gaseous NO molecules with the 16Ocus- centers or a contact of weakly adsorbed NO species with the ones. The present work is devoted to the investigation of POIEx between N18O and TiO2 Hombifine N (anatase) at T = 293 K by means of kinetic mass-spectrometry and temperature-programmed desorption (TPD) spectroscopy. From the linear dependence of the POIEx rate on N18O pressure it was shown that the exchange occurs via the collision interaction of gaseous NO molecule with the surface active site 16Ocus-. The activation energy (Ea = 0.221 ±0.003 eV) of oxygen exchange step image was calculated basing on the dependence of the exchange rate on the temperature in the 150-300 K range.</description><subject>Anatase</subject><subject>Collision dynamics</subject><subject>Irradiation</subject><subject>Isotopes</subject><subject>Light irradiation</subject><subject>Nitric oxide</subject><subject>Oxygen</subject><subject>Oxygen exchange</subject><subject>Photocatalysis</subject><subject>Radiation</subject><subject>Spectrometry</subject><subject>Spectroscopy</subject><subject>Temperature</subject><subject>Titanium dioxide</subject><issn>1010-6030</issn><issn>1873-2666</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNqNissKwjAURIMo-PyHC64LSVP6WIviyrrouhLttU2pSc0D9e_Nwg9wMcxwzkzIguUZj-I0TadhU0ajlHI6J0tre0ppkiRsQeS5005bJx9-EA4b0O9PiwqkDXhEwPetE6pFuKJ7YRCn2voRWF6XIFQTIpywCJUsg7hCXINXDRoYZNs5kMaIRgontVqT2V0MFje_XpHtYV_tjtFo9NOjdZdee6OCurCCZwnlRcz4f68v2BRJVQ</recordid><startdate>20170101</startdate><enddate>20170101</enddate><creator>Mikhaylov, Ruslan V</creator><creator>Glazkova, Nadezhda I</creator><creator>Nikitin, Konstantin V</creator><general>Elsevier BV</general><scope>7QL</scope><scope>7T7</scope><scope>7U9</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>H94</scope><scope>M7N</scope><scope>P64</scope></search><sort><creationdate>20170101</creationdate><title>Photostimulated oxygen isotope exchange between N^sup 18^O and anatase TiO^sub 2^ under light irradiation</title><author>Mikhaylov, Ruslan V ; Glazkova, Nadezhda I ; Nikitin, Konstantin V</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-proquest_journals_19374039213</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Anatase</topic><topic>Collision dynamics</topic><topic>Irradiation</topic><topic>Isotopes</topic><topic>Light irradiation</topic><topic>Nitric oxide</topic><topic>Oxygen</topic><topic>Oxygen exchange</topic><topic>Photocatalysis</topic><topic>Radiation</topic><topic>Spectrometry</topic><topic>Spectroscopy</topic><topic>Temperature</topic><topic>Titanium dioxide</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mikhaylov, Ruslan V</creatorcontrib><creatorcontrib>Glazkova, Nadezhda I</creatorcontrib><creatorcontrib>Nikitin, Konstantin V</creatorcontrib><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Virology and AIDS Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><jtitle>Journal of photochemistry and photobiology. 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At the same time the mechanism of formation of N18O-16Ocus- intermediate has not been investigated. Formation of the intermediate may occur via either a collision of the gaseous NO molecules with the 16Ocus- centers or a contact of weakly adsorbed NO species with the ones. The present work is devoted to the investigation of POIEx between N18O and TiO2 Hombifine N (anatase) at T = 293 K by means of kinetic mass-spectrometry and temperature-programmed desorption (TPD) spectroscopy. From the linear dependence of the POIEx rate on N18O pressure it was shown that the exchange occurs via the collision interaction of gaseous NO molecule with the surface active site 16Ocus-. The activation energy (Ea = 0.221 ±0.003 eV) of oxygen exchange step image was calculated basing on the dependence of the exchange rate on the temperature in the 150-300 K range.</abstract><cop>Lausanne</cop><pub>Elsevier BV</pub></addata></record> |
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| ispartof | Journal of photochemistry and photobiology. A, Chemistry., 2017-01, Vol.332, p.554 |
| issn | 1010-6030 1873-2666 |
| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Anatase Collision dynamics Irradiation Isotopes Light irradiation Nitric oxide Oxygen Oxygen exchange Photocatalysis Radiation Spectrometry Spectroscopy Temperature Titanium dioxide |
| title | Photostimulated oxygen isotope exchange between N^sup 18^O and anatase TiO^sub 2^ under light irradiation |
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