Dépôt numérique

Photosonochemical degradation of butyl-paraben: Optimization, toxicity and kinetic studies.

Daghrir, Rimeh; Dimboukou-Mpira, A.; Seyhi, Brahima; Drogui, Patrick (2014). Photosonochemical degradation of butyl-paraben: Optimization, toxicity and kinetic studies. Science of The Total Environment , vol. 490 . p. 223-234. DOI: 10.1016/j.scitotenv.2014.05.006.

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The objective of the present work is to evaluate the potential of a photosonolysis process for the degradation of butyl-paraben (BPB). After 120min of treatment time, high removal of BPB was achieved by the photosonolysis (US/UV) process (88.0±0.65%) compared to the photochemical (UV) and the conventional ultrasonication (US) processes. Several factors such as calorimetric power, treatment time, pH and initial concentration of BPB were investigated. Using a 24 factorial matrix, the treatment time and the calorimetric power are the main parameters influencing the degradation rate of BPB. Subsequently, a central composite design methodology has been investigated to determine the optimal experimental parameters for BPB degradation. The US/UV process applied under optimal operating conditions (at a calorimetric power of 40W during 120min and under pH7) is able to oxidize around 99.2±1.4% of BPB and to record 43.3% of mineralization. During the US/UV process, BPB was mainly transformed into 1 hydroxy BPB, dihydroxy BPB, hydroquinone and 4-hydroxybenzoic acid. Microtox biotests (Vibrio fisheri) showed that the treated effluent was not toxic. The pseudo-first order kinetic model (k=0.0367min-1) described very well the oxidation of BPB.

Type de document:
Mots-clés libres: butyl-paraben; photosonolysis; response surface methodology; wastewater treatment
Centre: Centre Eau Terre Environnement
Date de dépôt: 26 avr. 2017 13:32
Dernière modification: 26 avr. 2017 13:32
URI: http://espace.inrs.ca/id/eprint/3559

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