Abstract
The photocatalytic degradation of nitrate in aqueous solution has been examined using different Au/TiO2 photocatalysts with 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 highest apparent activation energy, probably reflecting the stronger adsorption of carbon dioxide as reaction product. (C) 2011 Elsevier B. V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 171-176 |
| Number of pages | 6 |
| Journal | Catalysis Today |
| Volume | 181 |
| Issue number | 1 |
| Early online date | 25 Jun 2011 |
| DOIs | |
| Publication status | Published - 12 Feb 2012 |
Keywords
- nitrate removal
- water treatment
- photocatalysis
- titania
- gold
- aqueous suspensions
- drinking-water
- particle-size
- fermi-level
- reduction
- TIO2
- catalysis
- nitrite
- ions
- nanoparticles