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
Degradation of nitrobenzene and nitrophenols by means of advanced oxidation processes in a homogeneous phase: Photolysis in the presence of hydrogen peroxide versus the Fenton reaction☆
TL;DR: In this paper, the authors compared the Fenton reaction with the direct photolysis of aqueous nitrobenzene (I), 2-nitrophenol (II), and 2,4-dinitrophenols (III) in the presence of hydrogen peroxide.
Journal ArticleDOI
Mechanistic aspects regarding the direct aqueous environmental photochemistry of phenol and its simple halogenated derivatives. A review.
TL;DR: Additional studies in natural water samples are required to assess the relative importance of these direct irradiation mechanisms relative to indirect photolysis and other abiotic and biotic degradation and environmental partitioning pathways across the continuum of marine, freshwater, and wastewater biogeochemical signatures.
Book
Environmental Chemistry: Fundamentals
TL;DR: In this article, the effects of Pollutants on the chemistry of the atmosphere, the Hydrosphere, and the Lithosphere of the Earth have been discussed, as well as their effects on the biosphere.
Journal ArticleDOI
Direct and indirect photolysis of seven micropollutants in secondary effluent from a wastewater lagoon
TL;DR: It was shown that there was only a small increase in photodegradation of the compounds at 25 °C compared with that in the simulated system, and hydroxyl radicals played an important role in the photodegrading of the micropollutants while singlet oxygen may also play a role.
Journal ArticleDOI
Carbamazepine degradation by UV and UV-assisted AOPs: Kinetics, mechanism and toxicity investigations
TL;DR: In this paper, the removal efficiency of CBZ was significantly enhanced by coupling H2O2 with UV and Fe3+/Fe2+ at 3600 mJ cm−2, 7.5, 60.5 and 56.7% CBZ degradation in the presence of Cl− and humic acid, respectively.
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