Uniform N-coordinated single-atomic iron sites dispersed in porous carbon framework to activate PMS for efficient BPA degradation via high-valent iron-oxo species
| Autor: | Shaohui Qiu, Wanqi Lin, Qi Zhou, Shisuo Fan, Yang Li, Ting Yang, Jinting Yan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
High-valent iron
Chemical substance Chemistry General Chemical Engineering chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Catalysis Chemical engineering Catalytic oxidation Environmental Chemistry Degradation (geology) 0210 nano-technology Dispersion (chemistry) Carbon Zeolitic imidazolate framework |
| Zdroj: | Chemical Engineering Journal. 389:124382 |
| ISSN: | 1385-8947 |
| Popis: | Iron-mediated activation of peroxymonosulfate (PMS) has been widely investigated for recalcitrant pollutants. However, maximizing the dispersion degree of the active iron sites in the catalysts is still a great challenge and attracting tremendous attention. Herein, we demonstrated that well-dispersed single atomic Fe sites embedded into N-doped porous carbon (FeSA-N-C), which derived from chemically Fe-doped zeolitic imidazolate frameworks, could work as Fe-based catalyst for efficient catalytic oxidation of recalcitrant organics via PMS activation. As expected, FeSA-N-C exhibited remarkably higher degradation activity (8.1 times faster) to BPA (a model pollutant) than that of Fe based nanoparticles-loaded N-doped carbon (FeNP-N-C). The sufficient Fe-Nx sites with single Fe atom as the building units were proposed to be the main active sites for PMS activation. Based on that, unlike the traditional sulfate radical-based advanced oxidation processes, BPA degradation was achieved via high-valent iron-oxo species. More particularly, it could be used over a wide range of pH 3.0–7.5 with almost no loss of degradation efficiency. This study will provide insights into the design of heterogeneous Fenton-like catalysts. |
| Databáze: | OpenAIRE |
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