Crossover magnetic amphiprotic catalysts for oil/water separation, the purification of aqueous and non-aqueous pollutants, and organic synthesis
| Autor: | Woori Jang, Young Boo Lee, Won San Choi, Hye Young Koo, Nara Han, Byung Kwon Kaang |
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| Rok vydání: | 2018 |
| Předmět: |
Pollutant
Aqueous solution Chemistry General Chemical Engineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Decomposition Industrial and Manufacturing Engineering 0104 chemical sciences Catalysis chemistry.chemical_compound Organic reaction Wastewater Chemical engineering Environmental Chemistry Magnetic nanoparticles Organic chemistry Organic synthesis 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 331:290-299 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2017.08.120 |
| Popis: | Magnetic amphiprotic catalysts (MACs) were synthesized by coating magnetic nanoparticles (MNPs) stepwise with polydopamine (Pdop), a polyethyleneimine (PEI) brush, octadecylamine (ODA), and Au. The amphiprotic characteristics of the MACs were tuned by varying the portions of the hydrophilic and hydrophobic moieties. The MACs normally dispersed in the hydrophobic layer but were forced into water to catalytically decompose aqueous pollutants upon the application of a magnetic field. When the magnetic field was turned off, the MACs naturally returned to the hydrophobic layer and catalytically decomposed non-aqueous pollutants. Next, the purified oil was readily separated from the oil/water mixture by using the magnetic field because the MACs absorbed oil. Oil-in-water and water-in-oil wastewater emulsions containing aqueous and non-aqueous pollutants, respectively, were also purified and separated into pure oil and water. A series of wastewater purification steps, including oil/water separation and the decomposition of aqueous and non-aqueous pollutants in both phases, was performed by in situ and continuous processes using the MACs. The MACs also performed catalytic organic reactions in organic solvents. |
| Databáze: | OpenAIRE |
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