Kinetics of acetaminophen degradation by Fenton oxidation in a fluidized-bed reactor |
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Authors: | Mark Daniel G de Luna Rowena M Briones Chia-Chi Su Ming-Chun Lu |
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Institution: | 1. Environmental Engineering Graduate Program, University of the Philippines, 1101 Diliman, Quezon City, Philippines;2. Department of Chemical Engineering, University of the Philippines, 1101 Diliman, Quezon City, Philippines;3. Department of Environmental Resources Management, Chia Nan University of Pharmacy and Science, Tainan 717, Taiwan |
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Abstract: | Acetaminophen (ACT), an analgesic and antipyretic substance, is one of the most commonly detected pharmaceutical compound in surface waters and wastewaters. In this study, fluidized-bed Fenton (FB-Fenton) was used to decompose ACT into its final degradation products. The 1.45-L cylindrical glass reactor had inlet, outlet and recirculating sections. SiO2 carrier particles were supported by glass beads with 2–4 mm in diameter. ACT concentration was determined by high performance liquid chromatography (HPLC). During the first 40 min of reaction, a fast initial ACT removal was observed and the “two-stage” ACT degradation conformed to a pseudo reaction kinetics. The effects of ferrous ion dosage and Fe2+]/H2O2] (FH ratio) were integrated into the derived pseudo second-order kinetic model. A reaction pathway was proposed based on the intermediates detected through SPME/GC–MS. The aromatic intermediates identified were hydroquinone, benzaldehydes and benzoic acids while the non-aromatic substances include alcohols, ketones, aldehydes and carboxylic acids. Rapid initial ACT degradation rate can be accomplished by high initial ferrous ion concentration and/or low FH ratio. |
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