|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|6329035||1619780||2014||12 صفحه PDF||سفارش دهید||دانلود رایگان|
- The treatment time and calorimetric power greatly affect the oxidation rate of BPB.
- Their contribution for BPB removal is 45.17% and 22.65%, respectively.
- More than 99% of BPB can be removed using the US/UV process.
- 43.3% of TOC removal was achieved and the toxicity on V. fisheri was reduced.
- The BPB degradation is well described by the pseudo-first-order kinetic (0.0367Â minâÂ 1).
The objective of the present work is to evaluate the potential of a photosonolysis process for the degradation of butyl-paraben (BPB). After 120Â min of treatment time, high removal of BPB was achieved by the photosonolysis (US/UV) process (88.0Â Â±Â 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 40Â W during 120Â min and under pHÂ 7) is able to oxidize around 99.2Â Â±Â 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 (kÂ =Â 0.0367Â minâÂ 1) described very well the oxidation of BPB.
Journal: Science of The Total Environment - Volume 490, 15 August 2014, Pages 223-234