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
Release of nitrous acid and nitrogen dioxide from nitrate photolysis in acidic aqueous solutions.
TL;DR: Results of cavity-enhanced absorption spectroscopy measurements of NO2 and HONO emitted during photodegradation of aqueous NO3(-) under acidic conditions find that NO2 is more efficiently hydrolyzed in solution when it is generated in situ during NO3 (-) photolysis than for the heterogeneous system where mass transfer of gaseous NO2 into bulk solution is prohibitively slow.
Journal ArticleDOI
Mineralization of sucralose by UV-based advanced oxidation processes: UV/PDS versus UV/H2O2
Yin Xu,Ziyan Lin,Hui Zhang +2 more
TL;DR: In this paper, the effects of oxidant concentration, initial sucralose concentration and pH on TOC removal were investigated and the results indicated that the mineralization of SUC increased with higher concentrations of oxidants and decreased with the increase of initial SUC concentration.
Journal ArticleDOI
Simultaneous degradation of ciprofloxacin, amoxicillin, sulfathiazole and sulfamethazine, and disinfection of hospital effluent after biological treatment via photo-Fenton process under ultraviolet germicidal irradiation
João Angelo Lima Perini,Adriano Luiz Tonetti,Cristiane Vidal,Cassiana Carolina Montagner,Raquel Fernandes Pupo Nogueira +4 more
TL;DR: In this article, a UVC-assisted photo-Fenton process was applied to hospital wastewater that had been submitted to anaerobic treatment, which quantitatively reduced the biochemical oxygen demand, chemical oxygen demand (COD), and total organic carbon (TOC), with low removal of antibiotics present in the wastewater.
Journal ArticleDOI
The role of carbonate radical in limiting the persistence of sulfur-containing chemicals in sunlit natural waters
Jiping Huang,Scott A. Mabury +1 more
TL;DR: *CO3- was found to contribute toward the photodegradation of sulfur-containing compounds in natural waters and showed a similar pathway with appearance of fenthion sulfoxide as the major product.
Journal ArticleDOI
The effect of sorption on the oxidation of polychlorinated biphenyls (PCBs) by hydroxyl radical
David L. Sedlak,Anders W. Andren +1 more
TL;DR: In this article, the reaction of three PCB congeners with hydroxyl radical (OH), generated in a photo-Fenton system (i.e., iron, hydrogen peroxide and light at pH 3), was followed to evaluate predictive models of transformation kinetics in the presence of particulates.
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