Journal ArticleDOI
Nitrate-induced photooxidation of trace organic chemicals in water.
TLDR
The oxidation kinetics of butyl chloride, nitrobenzene, anisole, and methylmercury in the presence of hydroxyl radical (OH) scavengers were used to determine the rate and quantum efficiency for production of OH from irradiated nitrate ions in water.Abstract:
The oxidation kinetics of butyl chloride, nitrobenzene, anisole, and methylmercury in the presence of hydroxyl radical (OH) scavengers were used to determine the rate and quantum efficiency for production of OH from irradiated nitrate ions in water. The experiments were conducted under steady-state irradiations with monochromatic radiation (313 nm) and with sunlight. The mean quantum efficiency for OH production at 313 nm rises from 0.013 +/- 0.002 at 20 /sup 0/C to 0.017 +/- 0.003 at 30 /sup 0/C in the pH range 6.2-8.2. Results of this study are used to estimate nitrate-induced photooxidation rates of trace organic chemicals under a variety of environmental conditions. 27 references, 6 figures, 2 tables.read more
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Journal ArticleDOI
Formation of nitrophenols upon UV irradiation of phenol and nitrate in aqueous solutions and in TiO2 aqueous suspensions.
TL;DR: The formation of nitrophenols was studied as a consequence of ultra violet (UV) irradiation of aqueous solutions of phenol and nitrate in the range of pH 1-12 and a reaction mechanism is proposed, based on the experimental results.
Journal ArticleDOI
Ferrioxalate complexes as strategy to drive a photo-FENTON reaction at mild pH conditions: A case study on levofloxacin oxidation
André A. Nogueira,André A. Nogueira,Bianca M. Souza,Bianca M. Souza,Márcia Dezotti,Rui A.R. Boaventura,Vítor J.P. Vilar +6 more
TL;DR: In this paper, the use of ferrioxalate photoactive complexes as a strategy to drive a photo-Fenton reaction at mild pH conditions, applied to the oxidation of antibiotic levofloxacin (LEV) in pure water and spiked in urban wastewater after secondary treatment, was evaluated at different pH values (30 to 60).
Journal ArticleDOI
Nitrate Ion Photolysis in Thin Water Films in the Presence of Bromide Ions
N. K. Richards,Lisa M. Wingen,Karen M. Callahan,Noriko Nishino,Michael T. Kleinman,Douglas J. Tobias,Barbara J. Finlayson-Pitts +6 more
TL;DR: Enhanced photochemistry in the presence of halide ions may be important for oxides of nitrogen production in field studies such as in polar snowpacks where the use of quantum yields from laboratory studies in the absence of halides would lead to a significant underestimate of the photolysis rates of nitrate ions.
Journal ArticleDOI
Chemical composition and photochemical formation of hydroxyl radicals in aqueous extracts of aerosol particles collected in Okinawa, Japan
Takemitsu Arakaki,Yukiko Kuroki,Kouichirou Okada,Yoshihide Nakama,Hirotsugu Ikota,Mika Kinjo,Tomihiko Higuchi,Masaya Uehara,Akira Tanahara +8 more
TL;DR: In this paper, the authors investigated the chemical composition and photochemical formation of hydroxyl radicals in the water-soluble fractions (WSF) of aerosol particles collected in Okinawa, Japan.
Journal ArticleDOI
Nitrate photosensitized degradation of atrazine during UV water treatment
TL;DR: In this article, the effect of nitrate on UV treatment of atrazine (ATZ) was investigated at pH 7 in phosphate buffer and solutions containing Suwannee River natural organic matter (NOM).
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