Photoassisted oxidation of nitrite to nitrate over different semiconducting oxides

Ali Milis, Xavier Domènech

Research output: Contribution to journalArticleResearchpeer-review

22 Citations (Scopus)

Abstract

The photocatalytic oxidation of nitrite to nitrate in aqueous solutions containing different semiconducting metallic oxides of environmental concern was investigated. From the results obtained, TiO2 and ZnO have been shown to be the most photoactive photocatalysts for nitrite photo-oxidation. For ZnO slurries, photogenerated H2O2 was detected (larger amounts in the presence of nitrite than in its absence). In addition, in the presence of nitrite the photochemical instability of ZnO in aqueous suspensions was increased. From an analysis of the results it is concluded that the nitrite is oxidized by photogenerated OH radicals in the adsorption layer of the semiconductor particles following Langmuir-Hinshelwood kinetics. © 1993.
Original languageEnglish
Pages (from-to)55-59
JournalJournal of Photochemistry and Photobiology, A: Chemistry
Volume72
Issue number1
DOIs
Publication statusPublished - 1 May 1993

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