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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