Photodecomposition of sodium dodecyl sulfate under high-intensity pulsed UV radiation of continuous spectrum and hydrogen peroxideстатья
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Дата последнего поиска статьи во внешних источниках: 1 февраля 2021 г.
Аннотация:Surfactants are widely used in industry and households, although they are typically non-toxic,their self-degradation products could have potential health and environmental effects. Therefore,the improvement of water purification technology from these substances is an essential problem.Within this paper, the features of the photochemical decomposition of an anionic surfactant (sodiumdodecyl sulfate) under the combined effect of high-intensity pulsed UV radiation of continuousspectrum and hydrogen peroxide are investigated. All experiments were conducted with an initialpollutant concentration of 10 mg L–1. Direct photolysis has proven to be an extremely inefficientmethod due to the low process rate and high energy consumption. However, the addition of hydrogenperoxide to a solution irradiated by polychromatic light drastically enhances the photodecompositionrate. The decomposition efficiency rises from 90% to more than 99% and the energyconsumption significantly decreases with an increase in the molar ratio of hydrogen peroxideand sodium dodecyl sulfate concentrations. The obtained values of electrical energy per order inconjunction with other process aspects demonstrate that the use of UV/H2O2 technology with axenon flashlamp as a radiation source is advantageous for the purification of solutions from theinvestigated contaminant.