Mechanism of persulfate activation with CuO for removing cephalexin and ofloxacin in water
| Autor: | Yinsu Wu, Yuanzhe Gao, Shengtao Xing, Wenqing Li |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
Hydrogen 010405 organic chemistry chemistry.chemical_element General Chemistry Electron deficiency 010402 general chemistry Persulfate Mass spectrometry Photochemistry 01 natural sciences 0104 chemical sciences Catalysis law.invention Electron transfer chemistry law Electron paramagnetic resonance Spectroscopy |
| Zdroj: | Research on Chemical Intermediates. 45:5549-5558 |
| ISSN: | 1568-5675 0922-6168 |
| Popis: | CuO was synthesized by a simple hydrothermal method and investigated as a heterogeneous activator of persulfate for the degradation of cephalexin and ofloxacin. X-ray photo-electron spectroscopy and hydrogen temperature-programmed reduction measurements reveal that CuO contains two types of Cu2+: one has more electron deficiency (named as Cu2+-h) and the other has relatively higher electron density (named as Cu2+-l). Electron paramagnetic resonance and radical scavenging experiments demonstrate that ·SO4− and ·O2− are responsible for the efficient degradation of cephalexin and ofloxacin, respectively. ·SO4− can be produced through the electron transfer from Cu2+-l to PS and the cleavage of peroxy bond, while ·O2− can be produced via the electron transfer from PS to Cu2+-h and the cleavage of S–O bond. Finally, the degradation intermediates were identified by liquid chromatograph–mass spectrometry. This study proposed a novel mechanism for the activation of persulfate with CuO, which is useful for the rational design of persulfate activator for controlling the production of active species. |
| Databáze: | OpenAIRE |
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