Kinetics of acetaminophen degradation by Fenton oxidation in a fluidized-bed reactor

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• 作者：Mark Daniel G. de Luna^a ; ^b ; Rowena M. Briones^a ; Chia-Chi Su^c ; Ming-Chun Lu^c ; ^{mmclu@mail.chna.edu.tw} ; ^{mclu@ms17.hinet.net}
• 关键词：Acetaminophen ; Fluidized-bed Fenton ; Kinetics ; Intermediates
• 刊名：Chemosphere
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：90
• 期：4
• 页码：1444-1448
• 全文大小：349 K

文摘

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.