Fabrication of hierarchical composite microspheres of copper-doped Fe3O4@P4VP@ZIF-8 and their application in aerobic oxidation
| Autor: | Ge Wang, Yue Qi, Yunfeng Lu, Jie Yu, Junying Hou, Yi Luan |
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| Rok vydání: | 2016 |
| Předmět: |
Chemistry
chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Heterogeneous catalysis 01 natural sciences Copper Catalysis 0104 chemical sciences Turnover number chemistry.chemical_compound Monomer Polymerization Chemical engineering Alcohol oxidation Materials Chemistry Organic chemistry 0210 nano-technology Acrylic acid |
| Zdroj: | New Journal of Chemistry. 40:10127-10135 |
| ISSN: | 1369-9261 1144-0546 |
| Popis: | Novel hierarchical magnetic composite microspheres of copper-doped Fe3O4@poly(4-vinylpyridine-co-divinylbenzene)@ZIF-8 (Cu-FPZ, Cu stands for copper doped) were successfully fabricated. The core–shell Fe3O4(PAA)@P4VP magnetic microspheres were first synthesized by a polymerization approach, in which the 4-vinylpyridine (4-VP) monomer interacted with a –COOH group of poly(acrylic acid) modified Fe3O4 by means of a hydrogen-bond interaction. Then Zn2+ was adsorbed on the surface of the P4VP shell, followed by the formation of a ZIF-8 porous shell with 2-methylimidazolate. Finally, nearly 5.45 wt% of copper content was incorporated with the ZIF-8 framework to form a magnetic core–shell copper-doped Fe3O4@P4VP@ZIF-8. The obtained copper-doped Fe3O4@P4VP@ZIF-8 catalyst was applied in the selective oxidation of alcohols and epoxidation of olefins using molecular oxygen as the oxidant. The results demonstrated that the magnetic core–shell copper-doped Fe3O4@P4VP@ZIF-8 catalyst showed better catalytic activity with significantly improved turnover number and turnover frequency (up to 8.25 h−1) than other copper MOFs. Furthermore, this heterogeneous catalyst could be cycled at least 15 times without significant loss of activity. |
| Databáze: | OpenAIRE |
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