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- W2202332238 abstract "The effect of low frequency (20 kHz) ultrasonic irradiation on the removal of sodium dodecylbenzene sulfonate (SDBS), phenol, 2-chlorophenol and 2,3dichlorophenol from synthetic aqueous effluents has been investigated. Sonolytic degradation of SDBS (at an initial concentration of 1 g/L) results in the formation of lower molecular weight compounds and is accompanied by low total oxidation rates. In parallel, water sonolysis results in the formation of hydrogen peroxide, Several heterogeneous catalysts (three noble metals and a metal oxide) were tested with respect to their effect on SDBS sonolysis. Of these, a CuO.ZnO supported on alumina catalyst appears to enhance both SDBS fragmentation and total oxidation rates as well as hydrogen peroxide formation. Phenolic compounds (at an initial concentration of 0.1 g/L) are only partially removed by ultrasound irradiation with 2-chlorophenol being more susceptible to degradation than phenol and 2,3-dichlorophenol. However, the presence of Fe2+ ions at concentrations as low as about 0.2 10-3 g/L generally substantially increases the rate of the uncatalysed sonolytic degradation. This is attributed to iron being capable of readily decomposing hydrogen peroxide (generated by water sonolysis) in a Fenton-like process to form reactive hydroxyl radicals as well as being an effective oxidation catalyst. All phenols are readily removed by the Fenton reagent without ultrasonic irradiation. However, at the conditions employed in this study, a combination of ultrasound and Fenton reagent has a detrimental effect on the efficiency of Fenton oxidation." @default.
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- W2202332238 date "2002-08-19" @default.
- W2202332238 modified "2023-09-27" @default.
- W2202332238 title "Ultrasound-assisted Oxidation Processes For The Removal Of Aromatic Contaminants From Aqueous Effluents" @default.
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