硫酸自由基在水处理中的反应特性
摘要
In this paper, the reaction mechanism for similar products of hydroxyl radicals (·OH) and sulfate radicals (SO4·-) were explained, the response properties of sulfate radicals in water treatment was investigated, and the ability of sulfate radicals to capture the π electron on C=C chemical bond, benzene ring and H atom in organic matters was discussed as well. Results show that capturing ability of sulfate radicals is generally ranked as the following: π electron in nonaromatic compounds > π electron in aromatic compounds (benzene series) > α-H > non α-H in compound. The organic matter degradation efficiency of sulfate radicals is related to not only the structure of organic matter, but also to the medium environment, that is, it related to the collision probability of surrounding matter. Hydroxyl radicals are produced when sulfate radicals capture the hydrogen atom of H2O in aqueous reaction due to the most reaction opportunities between sulfate radicals and water molecules.