Nitric oxide emission during the reductive heterogeneous photocatalysis of aqueous nitrate with TiO2Electronic supplementary information (ESI) available: Experimental procedure, Fig. S1-S3. See DOI: 10.1039/c5ra17914a

For the first time, nitric oxide (NO), a precursor of nitrogen dioxide (NO 2 , a NIOSH-listed atmospheric pollutant), has been found to be one of the final products of the photocatalytic reduction of nitrate in water using TiO 2 and formic acid as a hole scavenger. For the first time, nitric oxide (NO), a precursor of nitrogen dioxide (a NIOSH-listed pollutant), has been found to be one of the final products of the photocatalytic reduction of nitrate in water using TiO 2 and formic acid as a hole scavenger.