4.8 Article

The Existence of Nitrate Radicals in Irradiated TiO2 Aqueous Suspensions in the Presence of Nitrate Ions

Journal

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 33, Pages 10702-10706

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201804879

Keywords

nitrate; photocatalysis; radicals; TiO2

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Evidence of the existence of nitrate radical in irradiated aqueous TiO2 suspensions in the presence of nitrate ions are reported for the first time. The joint use of UV/Vis and EPR spectroscopy showed that nitrate radicals are formed by hole induced oxidation of nitrate ions. Photocatalytic degradation of a model alkene compound allowed to highlight the presence of an intermediate organic nitrate deriving from nitrate radical attack to the double bond of the substrate. These results not only allow deeper understanding of photocatalytic processes, but open the route to new green photocatalytic syntheses initiated by nitrate radicals and to new insights in the field of atmospheric chemistry.

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