Degradation of ofloxacin by potassium ferrate: kinetics and degradation pathways

Drug residues, including various antibiotics, are being increasingly detected in aqueous environments. Ofloxacin (OFX) is one such antibiotic that is widely used in the treatment of several bacterial infections; however, chronic exposure to this antibiotic can have adverse impacts on human health. H...

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Bibliographic Details
Published in:Environmental science and pollution research international 2022-06, Vol.29 (29), p.44504-44512
Main Authors: Chen, Yanghan, Jin, Qiuye, Tang, Zhaomin
Format: Article
Language:English
Subjects:
Antibiotics
Aquatic Pollution
Aqueous environments
Atmospheric Protection/Air Quality Control/Air Pollution
Bacterial diseases
Chronic exposure
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Humic acids
Intermediates
Ions
Iron
Liquid chromatography
Mass spectrometry
Mass spectroscopy
Ofloxacin
Oxidation
Performance degradation
pH effects
Potassium
Potassium ferrate
Quadrupoles
Research Article
Waste Water Technology
Wastewater treatment
Water Management
Water Pollution Control
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Summary:Drug residues, including various antibiotics, are being increasingly detected in aqueous environments. Ofloxacin (OFX) is one such antibiotic that is widely used in the treatment of several bacterial infections; however, chronic exposure to this antibiotic can have adverse impacts on human health. Hence, the identification of an effective OFX degradation method is essential. Thus, in this study, the degradation performance of OFX using potassium ferrate (Fe(VI)) under the influence of different initial concentrations, pH, temperature, and common ions in water was investigated. OFX degradation by Fe(VI) was directly proportional to the concentration of Fe(VI) and temperature and inversely proportional to the pH. Among the common ions in water, Fe 3+ and NH 4 + could significantly promote the degradation of OFX by Fe(IV), while humic acid (HA) significantly inhibited it. Under the conditions of [Fe(VI)]:[OFX] = 15:1, T  = 25℃, and pH = 7.0, the removal efficiency of 8 μM OFX reached more than 90% in 4 min. Seven intermediates were identified by quadrupole time-of-flight tandem ultra-performance liquid chromatography mass spectrometry (Q-TOF LC/MS), and two possible pathways for the degradation of OFX by Fe(VI) were proposed. Overall, the results suggest that advanced oxidation technology using Fe(VI) is effective for treating wastewater containing OFX.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-022-18949-x