1. Steady release-activation of hydrogen peroxide and molecular oxygen towards the removal of ciprofloxacin in the FeOCl/CaO 2 system.
- Author
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Wang L, Yang H, Yao J, Wu Q, He Z, and Yang Y
- Subjects
- Ciprofloxacin, Ferric Compounds, Ferrous Compounds, Oxidation-Reduction, Oxygen, Reactive Oxygen Species, Hydrogen Peroxide, Superoxides
- Abstract
Difficult storage of hydrogen peroxide (H
2 O2 ), low production of reactive oxygen species (ROS), and inefficient Fe(II)/Fe(III) recycling limit the application of the Fenton-like process. Calcium peroxide (CaO2 ) based iron oxychloride (FeOCl) system was developed for solving these deficiencies, and ciprofloxacin (CIP) was effectively degraded within 20 min treatment. 0.33 mmol/L H2 O2 and 2.4 mg/L dissolved oxygen (DO) were produced via CaO2 . Quenching experiments and electron paramagnetic resonance results confirmed that hydroxyl radicals (·OH) and superoxide anion (·O2 - ) worked as the main ROS. Density functional theory (DFT) calculations and experimental results suggested that H atoms of H2 O2 adsorbed on FeOCl favored the activation of H2 O2 into ·OH and DO into ·O2 - , and electrophilic Cl and O coordination in FeOCl contributed to the cycle of Fe(II)/Fe(III). ·OH and·O2 - were responsible for CIP degradation, and toxicity assessments demonstrated that the developed system reduced the hazard of treated solution. Clarity of FeOCl/CaO2 system triple roles, including H2 O2 and O2 production, activation into ROS, and Fe(II)/Fe(III) recycling, facilitates the efficient utilization of O2 in Fenton-like system., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Ltd. All rights reserved.)- Published
- 2022
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