Effect of complexation on photocatalytic degradation of dissolved organic nitrogen compounds

Onar A. N., Akdemir N.

ANALYTICAL LETTERS, vol.40, no.15, pp.2949-2958, 2007 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 15
  • Publication Date: 2007
  • Doi Number: 10.1080/00032710701606358
  • Journal Name: ANALYTICAL LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2949-2958
  • Keywords: dissolved organic nitrogen, photocatalytic degradation, EDTA, chelating, metal ions, NATURAL-WATERS, ETHYLENEDIAMINETETRAACETIC ACID, TITANIUM-DIOXIDE, OXIDATION, TIO2, EDTA, PHOTOOXIDATION, MECHANISMS, CARBON, OXYGEN
  • Ondokuz Mayıs University Affiliated: No

Abstract

The effect of metal ions on TiO2 mediated photocatalytic oxidation for the determination of dissolved organic nitrogen compounds is investigated. Ethylenediaminetetraaceticacid was chosen as a model molecule for DON compounds. At pH 2, 5, 7, and 10 aqueous EDTA solutions were irradiated at 254 nm in the presence of Fe2+, Cu2+, Zn2+, Ni2+ or Co2+ ions. The sum of produced nitrate, nitrite, and ammonium ion concentrations gave the total oxidation recovery. At low pH, the photocatalytic oxidation recoveries of Fe-EDTA, Ni-EDTA, and Co-EDTA were significantly lower than the photocatalytic degradation of EDTA. The presence of free Fe2+, Ni2+, and Co2+ ions decreased the photocatalytic oxidation recovery. The [NH4+]/[NO3-] ratio was higher for Cu-EDTA.