Crossover magnetic amphiprotic catalysts for oil/water separation, the purification of aqueous and non-aqueous pollutants, and organic synthesis

Title
Crossover magnetic amphiprotic catalysts for oil/water separation, the purification of aqueous and non-aqueous pollutants, and organic synthesis
Authors
구혜영장우리강병권한나라이영부최원산
Keywords
oil water separation; Amphiprotic catalyst; polydopamine; Polyelectrolyte brush; magnetic catalysts; Pollutant purification
Issue Date
2018-01
Publisher
Chemical engineering journal
Citation
VOL 331-299
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/67152
ISSN
1385-8947
Appears in Collections:
KIST Publication > Article
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