Enhanced superoxide radical production for ofloxacin removal via persulfate activation with Cu-Fe oxide
| Autor: | Shengtao Xing, Beibei Wang, Yuan Ma, Qing Wang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Chemistry
General Chemical Engineering Oxide 02 engineering and technology General Chemistry 010501 environmental sciences 021001 nanoscience & nanotechnology Heterogeneous catalysis Persulfate 01 natural sciences Decomposition Redox Industrial and Manufacturing Engineering Catalysis chemistry.chemical_compound Adsorption Environmental Chemistry Degradation (geology) 0210 nano-technology 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Chemical Engineering Journal. 354:473-480 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2018.08.055 |
| Popis: | Cu-Fe composite oxides with different Cu:Fe ratios were synthesized by a hydrothermal method and investigated as a heterogeneous catalyst for persulfate activation. The obtained samples exhibited much higher activity than CuFe2O4 for the degradation and mineralization of ofloxacin with persulfate, and the optimized Cu:Fe ratio was 1:1 (CuFe1). The results of catalyst characterization and electron paramagnetic resonance analysis indicate that the activities of the catalysts for ofloxacin degradation and superoxide radical ( O2−) production are highly positively correlated with their redox ability. The removal efficiencies of ofloxacin in the presence of different scavengers further demonstrate that O2− is the dominant reactive species in this process, which is quite different from previous studies. It is suggested that CuFe1 with higher oxidation ability could weaken the S O bond of adsorbed persulfate, thus promoting the decomposition persulfate into O2−. Finally, the possible degradation pathway of ofloxacin was proposed according to the liquid chromatography−mass spectrometry result. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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