Photocatalytic nitrate reduction over Au/TiO2

The photocatalytic degradation of nitrates in aqueous solution has been examined using different Au/TiO2 photocatalysts and using oxalic acid as hole scavenger. Although complete elimination of oxalic acid was possible under conditions employed, complete nitrate removal was not achieved and the extent of conversion showed a dependence on hole scavenger concentration. The reacting stoichiometry was greater than predicted from the corresponding redox equations and suggests competitive reaction between protons and nitrate for conduction band electrons. The different photocatalysts exhibited different temperature sensitivities with the Hombikat supported Au showing the greatest apparent activation energy.