Efficient degradation of atrazine by CoMgAl layered double oxides catalyzed peroxymonosulfate: Optimization, degradation pathways and mechanism
| Autor: | Yichen Hong, Jiali Peng, Yan Yan, Xiuge Zhao, Gang Yao, Bo Lai |
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| Rok vydání: | 2019 |
| Předmět: |
Reaction mechanism
Quenching (fluorescence) Chemistry General Chemical Engineering Radical 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences High-performance liquid chromatography Industrial and Manufacturing Engineering 0104 chemical sciences Catalysis chemistry.chemical_compound Environmental Chemistry Degradation (geology) Atrazine 0210 nano-technology Ternary operation Nuclear chemistry |
| Zdroj: | Chemical Engineering Journal. 370:354-363 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2019.03.127 |
| Popis: | Ternary CoMgAl-LDOs were synthesized by co-precipitation and employed in the activation of peroxymonosulfate (PMS) for atrazine (ATZ) removal. A series of catalysts with different Co: Mg: Al ratios were obtained and characterized by XRD, SEM, EDS and XPS. Several key parameters such as Co: Mg: Al ratios, catalyst dosage, PMS dosage, initial pH and initial ATZ concentration were optimized. The results show that Co1Mg2Al1-LDO/PMS system exhibited better degradation performance and the maximum ATZ removal (98.7%) and TOC removal (26.5%) were obtained under the optimal conditions (Co1Mg2Al1-LDO = 75 mg/L, PMS = 0.4 mM and ATZ concentration = 10 mg/L at initial pH = 6.3). To verify the excellent performance in the Co1Mg2Al1-LDO/PMS system, three control experiments (i.e., PMS alone system, Co1Mg2Al1-LDO alone system and Mg3Al1-LDO/PMS system) and reusability tests were carried out. Furthermore, a total of eight intermediates were detected by UPLC-QTOF-MS/MS and the degradation pathways of ATZ were proposed. Besides, quenching experiments demonstrated that SO4 − acted as the dominant active radicals and the amount of SO4 − was quantified indirectly by HPLC. Finally, a reasonable reaction mechanism of Co1Mg2Al1-LDO/PMS system for ATZ removal was put forward according to the comprehensive analysis. |
| Databáze: | OpenAIRE |
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