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Visible-Light Photoactivity of Nitrogen-Doped TiO_2: Photo-oxidation of HCO_2H to CO_2 and H_2O

Balcerski, William and Ryu, Su Young and Hoffmann, Michael R. (2007) Visible-Light Photoactivity of Nitrogen-Doped TiO_2: Photo-oxidation of HCO_2H to CO_2 and H_2O. Journal of Physical Chemistry C, 111 (42). pp. 15357-15362. ISSN 1932-7447. https://resolver.caltech.edu/CaltechAUTHORS:20150806-062659132

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Abstract

Nitrogen-doped TiO_2 was synthesized by high-temperature exposure of TiO_2 to ammonia. The catalytic efficiency was tested by monitoring the photocatalytic degradation of formate (HCO_2^-) to CO_2 and H_2O under visible-light irradiation. The N-doped TiO_2 powders were found to be active for the degradation of formic acid under visible light. However, the catalytic efficiency of the N-doped TiO_2 under UV light alone is less than that of the pure TiO_2 starting material. FTIR evidence indicates that the visible-light-active N-doped TiO_2 has defect sites in the form of Ti−N triple bonds and that the increase of these sites leads to a loss of crystallinity that accounts for the reduced photocatalytic activity under UV irradiation. An optimal synthesis temperature of 550 °C was determined as a balance point between catalyst crystallinity and the presence of defect sites that absorb visible-light photons.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/jp074989oDOIArticle
http://pubs.acs.org/doi/full/10.1021/jp074989oPublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 2007 American Chemical Society. Received: June 26, 2007; In Final Form: August 4, 2007. Publication Date (Web): October 3, 2007. We gratefully acknowledge the Northrop Grumman Innovation Alliance Grant Program for support of this research. Special thanks are extended to Dr. Ronald Pirich for his support and encouragement.
Funders:
Funding AgencyGrant Number
Northrop Grumman Innovation AllianceUNSPECIFIED
Issue or Number:42
Record Number:CaltechAUTHORS:20150806-062659132
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150806-062659132
Official Citation:Visible-Light Photoactivity of Nitrogen-Doped TiO2:  Photo-oxidation of HCO2H to CO2 and H2O William Balcerski, Su Young Ryu, and Michael R. Hoffmann The Journal of Physical Chemistry C 2007 111 (42), 15357-15362 DOI: 10.1021/jp074989o
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59254
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:06 Aug 2015 16:38
Last Modified:03 Mar 2020 13:01

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