Photochemical Degradation of Aqueous Organics in Chlorinated Solutions

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ProQuest, 2008 - 106 pages
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The photodegradation of chlorine-based disinfectants NH2Cl, HOCl, and OCl- under UV irradiation from low- and medium-pressure Hg lamps was studied. The quantum yields of aqueous chlorine and chloramine under 254 nm (low pressure UV) irradiation were greater than 1.2 mol Es -1 for free chlorine in the pH range of 4 to 10 and 0.4 mol Es -1 for monochloramine at pH 9. Quantum yields for medium pressure (200-350 nm) ranged from 1.2 to 1.7 mol Es-1 at neutral and basic pH to 3.7 mol Es-1 at pH 4 for free chlorine, and 0.8 mol Es-1 for monochloramine. Hydroxyl radicals (·OH) are a direct photolysis product of both aqueous free chlorine and hydrogen peroxide under UV irradiation. The photooxidation rates of an ·OH probe compound, nitrobenzene, were compared in aqueous solutions of free chlorine, and H2O2, exposed to monochromatic UV irradiation (254 nm). Acidic (
 

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Contents

Chlorine Photolysis and Subsequent OH Radical Production during
9
Comparative OHOxidation using UVCI2 and UVH202 Processes
32
Advanced Oxidation Kinetics of Aqueous Tri Alkyl Phosphate Flame
54
Biodegradable Organic Carbon from Photooxidation of Tri Alkyl Phosphates
74
Overall Summary and Conclusions
93
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