Reaction kinetics and oxidation product formation in the degradation of acetaminophen by ferrate (VI)

Hongyu Wang*, Yibing Liu, Jia-Qian Jiang*

*Corresponding author for this work

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Abstract

This paper investigates the degradation of acetaminophen (AAP) in aqueous solutions by ferrate (VI), aiming to propose the kinetics, pathways and the oxidation products’ formation in the AAP degradation. A series of jar tests were undertaken over ferrate (VI) dosages (molar ratios of ferrate (VI):AAP, 5:1 to 25:1) and pH values (4–11). The effects of co-existing ions (0.2–5 mM) and humic acid (10–50 mg l−1) on the AAP removal were investigated. Ferrate (VI) can remove 99.6% AAP (from 1000 μg l−1) in 60 min under study conditions when majority of the AAP reduction occurred in the first 5 min. The treatment performance depended on the ferrate(VI) dosage, pH and the type and strength of co-existing ions and humic acid. Raising ferrate (VI) dosage with optimal pH 7 improved the AAP degradation. In the presence of humic acid, the AAP degradation by ferrate (VI) was promoted in a short period (<30 min) but then inhibited with increasing in humic acid contents. The presence of Al3+, CO32− and PO43− ions declined but the existence of K+, Na+, Mg2+ and Ca2+ ions can improve the AAP removal. The catalytic function of Al3+ on the decomposition of ferrate (VI) in aqueous solution was found.The kinetics of the reaction between ferrate (VI) and AAP was pseudo first-order for ferrete (VI) and pseudo second-order for AAP. The pseudo rate constant of ferrate (VI) with AAP was 1.4 × 10−5 L2 mg−2 min−1. Three oxidation products (OPs) were identified and the AAP degradation pathways were proposed.
Original languageEnglish
Pages (from-to)583-590
Number of pages8
JournalChemosphere
Volume155
Early online date4 May 2016
DOIs
Publication statusPublished - Jul 2016

Keywords

  • reaction kinetics
  • oxidation
  • ferrate (VI)

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