Effect of complexation on photocatalytic degradation of dissolved organic nitrogen compounds


Onar A. N., Akdemir N.

ANALYTICAL LETTERS, cilt.40, sa.15, ss.2949-2958, 2007 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 40 Sayı: 15
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1080/00032710701606358
  • Dergi Adı: ANALYTICAL LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2949-2958
  • Anahtar Kelimeler: dissolved organic nitrogen, photocatalytic degradation, EDTA, chelating, metal ions, NATURAL-WATERS, ETHYLENEDIAMINETETRAACETIC ACID, TITANIUM-DIOXIDE, OXIDATION, TIO2, EDTA, PHOTOOXIDATION, MECHANISMS, CARBON, OXYGEN
  • Ondokuz Mayıs Üniversitesi Adresli: Hayır

Özet

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.