Details

Autor(en) / Beteiligte

• Han, Qi
• Wang, Hongjie
• Dong, Wenyi
• Liu, Tongzhou
• Yin, Yulei
• Fan, Hongkai

Titel

Degradation of bisphenol A by ferrate(VI) oxidation: Kinetics, products and toxicity assessment

Ist Teil von

• Chemical engineering journal (Lausanne, Switzerland : 1996), 2015-02, Vol.262, p.34-40

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Ferrate oxidation was an effective method in removing BPA and related toxicity.•The reaction between ferrate and BPA was fitted with pseudo-second order kinetics.•Based on the twelve determined intermediates, two possible pathways were proposed.•Removal of toxicity exhibited a hysteresis effect compared to BPA degradation.•The increase of toxicity was due to the formation of more toxic intermediates. A series of batch experiments were carried out to investigate the factors influencing BPA degradation by ferrate(VI) and the reaction rate kinetics, including molar ratio of ferrate(VI) to BPA (0.1–8.0), initial solution pH (3.0–11.0) and temperature (283–323K). Reaction pathways were proposed according to the determination of intermediate products and the toxicity variation during the BPA degradation process was evaluated by marine luminescent bacteria (Vibriofischeri). BPA degradation by ferrate(VI) was effective and rapid, with a major BPA removal happening within 3min. With an initial BPA concentration of 4.4μmol/L, a ferrate(VI) to BPA molar ratio of 8.0, an initial solution pH of 7.0 and a temperature 298K, ca. 97.5% BPA removal was achieved. Twelve reaction products were identified by gas chromatography/mass spectrometry–mass spectrometry (GC/MS–MS) and two possible pathways for BPA degradation by ferrate(VI) were proposed, featuring a series of steps including dehydroxylation, cleavage of C–C bond, OH group addition, and oxidation. Unlike the rapid degradation of BPA by ferrate(VI), the elimination of toxicity exhibited a hysteresis effect and there was a rise tendency within the first 5min, which might be caused by formation of more toxic intermediates, such as benzoquinone, hydroquinone, styrene.