Enhanced Degradation of Organic Pollutants with Microwave-induced Liquid-in-plasma (MLP): Case of Flame Retardant Tetrabromobisphenol-A in Alkaline Aqueous Media

Satoshi Horikoshi, Seiya Sawada, Akihiro Tsuchida, Nick Serpone
2020 Journal of Oleo Science  
We report the enhanced degradation of a widely used brominated flame retardant, tetrabromobisphenol-A (TBBPA), which is soluble only in organic solvents and strongly alkaline solutions, where most advanced oxidation processes (AOPs) for such substrates tend to be rather inefficient. We further report an environmentally friendly method (microwave-induced plasma-in-liquid; MPL) that operates efficiently in alkaline aqueous media without the need for organic solvents to enhance the solubility of
more » ... BPA in water. The enhanced debromination and almost complete mineralization of TBBPA under alkaline conditions occurs within 20 min of MPL irradiation. This method, which is a new member of the AOP family, provides a simple and green approach to detoxify aqueous media contaminated with TBBPA, which requires only electric power and neither catalysts nor oxidizing agents. Several intermediate species have been identified by liquid chromatography/mass spectrometry (LC-MS), following events that involved reactive oxygen species (ROSs) such as·OH, whose first task was to approach the substrate at carbon atoms bearing the highest electron densities.
doi:10.5650/jos.ess19333 pmid:32051360 fatcat:qwxd2hv6z5e7den7c4bq3j4up4