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- W4308793477 endingPage "503" @default.
- W4308793477 startingPage "405" @default.
- W4308793477 abstract "Photochemical reactions generally result in cleavage of a chemical bond. As such, primary photochemical reactions can lead to degradation of compounds in irradiated media. Direct photolysis tends to be a selective process that is limited to compounds that are able to absorb incident radiation and use the energy of the absorbed photon to promote a chemical reaction. Direct photolysis is an efficient process for relatively few molecules, but for some of these compounds, photolysis is the process of choice for promoting degradation. A more common strategy involves the use of UV irradiation to promote the formation of reactive intermediates, often in the form of free radicals. Reactive intermediates are often formed in hybrid processes in which a promoter is added immediately before UV exposure to allow the formation of the reactive intermediate. Examples of these hybrid processes include: H 2 O 2 /UV, Chlorine/UV, Chloramine/UV, and Persulfate/UV, all of which result in the formation of free radicals that function as strong oxidizing agents. The principles of physics and chemistry that govern UV Advanced Oxidation Processes (UV-AOPs) are presented along with descriptions of experimental methods that are used to estimate fundamental reaction parameters. Also included is information to describe the effects of solution composition on direct photolysis and UV-AOP dynamics. Vacuum UV (VUV) can also be applied to aqueous solutions to promote photolysis of the solvent (water), resulting in the formation of reactive intermediates. In a similar manner, UV radiation can be used to promote the formation of reactive intermediates that function as powerful reducing agents. The most common UV Advanced Reduction Process (UV-ARP) is the sulfite/UV process, which promotes the formation of the hydrated electron, an extremely powerful reducing agent." @default.
- W4308793477 created "2022-11-15" @default.
- W4308793477 date "2022-10-13" @default.
- W4308793477 modified "2023-09-26" @default.
- W4308793477 title "Photolysis and Advanced Reaction Processes for Control of Trace Contaminants" @default.
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