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Photocatalytic oxidation of aqueous ammonia (ammonium ion) to nitrite or nitrate at TiO2 particles

Photokatalytische Oxidation von wäßrigem Ammoniak (Ammoniumion) zu Nitrit oder Nitrat an TiO2 Partikeln

  • Anorganische Und Physikalische Chemie
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Summary

The photocatalytic oxidation of ammonia (ammonium ion) in the presence of air or pure oxygen at titanium(IV) oxide powder surfaces and induced by UV light was investigated. Experimental conditions were varied and the effect ofpH, sparging gas, as well as the concentration of both ammonia (ammonium ion) and photocatalyst were investigated. It has been established that the principal product of photocatalytic oxidation depends onpH, and is either nitrite or nitrate. A gas-diffusion flow injection analysis system with conductivity detection was used for on-line monitoring of ammonia concentration. In addition, ion-chromatography with UV detection was utilized for offline monitoring of nitrite and nitrate concentrations. The use of a photocatalyst such as TiO2 may prove to be a viable method for conversion of ammonia (ammonium ion) to either nitrite or nitrate.

Zusammenfassung

Es wurde die photokatalytische Oxidation von Ammoniak (Ammoniumion) mittels Luft oder reinem Sauerstoff an Titan(IV)oxid-Pulveroberflächen unter Induktion von UV-Licht untersucht. Die experimentellen Bedingungen wurden variiert, wobei der Effekt despH-Wertes, des Spülgases und sowohl die Ammoniak- als auch die Photokatalysator-Konzentration berücksichtigt wurde. Dabei ergab sich, daß das Hauptprodukt der photokatalytischen Oxidation vompH abhängt und entweder Nitrit oder Nitrat ist. Ein Gasdiffusions-Fließinjektions-Analysensystem wurde zur on-line-Kontrolle der Ammoniak-Konzentration verwendet. Off-line-Ionenchromatographie mit UV-Detektion wurde zur Konzentrationsbestimmung für Nitrit und Nitrat herangezogen. Die Verwendung von Photokatalysatoren wie Titanoxid könnte sich als gangbarer Weg erweisen, um Ammoniak (Ammoniumion) entweder zu Nitrit oder zu Nitrat umzusetzen.

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Authors and Affiliations

  1. Department of Chemical and Metallurgical Engineering, Mackay School of Mines, University of Nevada, 89557, Reno, NV, USA

    Cy H. Pollema & James L. Hendrix

  2. Faculty of Chemistry, University of Belgrade, YU-11001, Belgrade, Yugoslavia

    Emil B. Milosavljević & Ljiljana Solujić

  3. Department of Chemistry, University of Nevada, 89557, Reno, NV, USA

    John H. Nelson

Authors
  1. Cy H. Pollema
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  2. Emil B. Milosavljević
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  3. James L. Hendrix
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  4. Ljiljana Solujić
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  5. John H. Nelson
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Pollema, C.H., Milosavljević, E.B., Hendrix, J.L. et al. Photocatalytic oxidation of aqueous ammonia (ammonium ion) to nitrite or nitrate at TiO2 particles. Monatsh Chem 123, 333–339 (1992). https://doi.org/10.1007/BF00810945

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  • DOI: https://doi.org/10.1007/BF00810945

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