Two-dimensional RuO2 nanosheets as robust catalysts for peroxymonosulfate activation
| Autor: | Chuhyung Kim, Seong Ju Hwang, Jaesang Lee, Jonghun Lim, Jang Mee Lee, Wonyong Choi |
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| Rok vydání: | 2019 |
| Předmět: |
Materials Science (miscellaneous)
Nanoparticle 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Decomposition law.invention Nanomaterials Catalysis chemistry.chemical_compound Electron transfer Transition metal chemistry law 0210 nano-technology Electron paramagnetic resonance 0105 earth and related environmental sciences General Environmental Science Benzoic acid |
| Zdroj: | Environmental Science: Nano. 6:2084-2093 |
| ISSN: | 2051-8161 2051-8153 |
| DOI: | 10.1039/c9en00500e |
| Popis: | This study explored for the first time the application of two-dimensional (2D) ruthenium oxide (RuO2) nanosheets (NSs) for organic decomposition through peroxymonosulfate (PMS) activation. RuO2 NSs outperformed not only the corresponding RuO2 nanoparticles (NPs) but also other common PMS activators such as transition metal oxides and carbonaceous nanomaterials, which is ascribed to facile electron transfer on 2D nanosheets, higher surface area and porosity, and favorable interaction with PMS on the hydrophilic surface. Aside from the higher PMS activation efficiency, the potential advantages of RuO2 NSs include (i) optimized performance under weakly acidic and neutral conditions and (ii) capability to utilize both PMS and PDS as radical precursors unlike Co3O4. In addition, RuO2 NSs/PMS could decompose both aromatic (e.g., bisphenol A, benzoic acid, and ranitidine) and non-aromatic compounds (e.g., dichloroacetate) to a significant extent, which is in marked contrast to the carbon nanotube–PMS system of which the efficiency sensitively depends on the kind of substrate. The generation of a sulfate radical (SO4˙−) as a main oxidant (from PMS decomposition) was corroborated by not only an outstanding inhibition effect of methanol (a sulfate radical scavenger) but also the formation of the sulfate radical adduct in the electron paramagnetic resonance (EPR) spin-trapping test. As a practical method of utilizing RuO2 NSs, RuO2 NSs could be coupled with magnetic Fe3O4, which enabled not only the facile recovery of the catalyst after use but also the robust catalytic performance without losing the activity during repeated use. Despite the high material cost of RuO2, such superiorities can make it an effective, stable, and reusable PMS activator. |
| Databáze: | OpenAIRE |
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