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Technical University of Crete
Technical University of Crete
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| URI | http://purl.tuc.gr/dl/dias/87AC87DF-6EBB-4A8F-8D6A-F916E575BE0F | - |
| Identifier | https://doi.org/10.1016/j.ultsonch.2015.12.002 | - |
| Identifier | https://www.sciencedirect.com/science/article/pii/S135041771530095X?via%3Dihub | - |
| Language | en | - |
| Extent | 9 pages | en |
| Title | Sonochemical degradation of ethyl paraben in environmental samples: statistically important parameters determining kinetics, by-products and pathways | en |
| Creator | Papadopoulos Costas | en |
| Creator | Frontistis Zacharias | en |
| Creator | Antonopoulou Maria | en |
| Creator | Venieri Danai | en |
| Creator | Βενιερη Δαναη | el |
| Creator | Konstantinou, Ioannis K | en |
| Creator | Mantzavinos Dionysis | en |
| Creator | Μαντζαβινος Διονυσης | el |
| Publisher | Elsevier | en |
| Content Summary | The sonochemical degradation of ethyl paraben (EP), a representative of the parabens family, was investigated. Experiments were conducted at constant ultrasound frequency of 20 kHz and liquid bulk temperature of 30 °C in the following range of experimental conditions: EP concentration 250-1250 μg/L, ultrasound (US) density 20-60 W/L, reaction time up to 120 min, initial pH 3-8 and sodium persulfate 0-100 mg/L, either in ultrapure water or secondary treated wastewater. A factorial design methodology was adopted to elucidate the statistically important effects and their interactions and a full empirical model comprising seventeen terms was originally developed. Omitting several terms of lower significance, a reduced model that can reliably simulate the process was finally proposed; this includes EP concentration, reaction time, power density and initial pH, as well as the interactions (EP concentration) × (US density), (EP concentration) × (pHo) and (EP concentration) × (time). Experiments at an increased EP concentration of 3.5 mg/L were also performed to identify degradation by-products. LC-TOF-MS analysis revealed that EP sonochemical degradation occurs through dealkylation of the ethyl chain to form methyl paraben, while successive hydroxylation of the aromatic ring yields 4-hydroxybenzoic, 2,4-dihydroxybenzoic and 3,4-dihydroxybenzoic acids. By-products are less toxic to bacterium V. fischeri than the parent compound. | en |
| Type of Item | Peer-Reviewed Journal Publication | en |
| Type of Item | Δημοσίευση σε Περιοδικό με Κριτές | el |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2018-10-10 | - |
| Date of Publication | 2016 | - |
| Subject | Aqueous matrix | en |
| Subject | Estrogenicity | en |
| Subject | Factorial design | en |
| Subject | Intermediates | en |
| Subject | Micro-pollutants | en |
| Subject | Sonodegradation | en |
| Bibliographic Citation | C. Papadopoulos, Z. Frontistis, M. Antonopoulou, D. Venieri, I. Konstantinou and D. Mantzavinos, "Sonochemical degradation of ethyl paraben in environmental samples: statistically important parameters determining kinetics, by-products and pathways," Ultrason. Sonochem., vol. 31, pp. 62-70, Jul. 2016. doi: 10.1016/j.ultsonch.2015.12.002 | en |
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