Treatment of a mixture of pharmaceuticals, herbicides and perfluorinated compounds by powdered activated carbon and ozone: Synergy, catalysis and insights into non-free OH contingent mechanisms

• Published in: The Science of the total environment 2021-07, Vol.777, p.146138-146138, Article 146138
• Main Authors: Alameddine, Mirna, Siraki, Arno, Tonoyan, Lusine, Gamal El-Din, Mohamed
• Format: Article
• Language: English
• Subjects: Adsorption; Catalytic mechanism; Catalytic ozonation; Micropollutants; Reactive oxygen species
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2021.146138

Powdered activated carbon (PAC) is a strong adsorbent also capable of catalyzing ozonation processes. Ozone (O3) and PAC were simultaneously applied to treat a mixture of 17 micropollutants (MPs) at low concentrations, including 13 compounds that were studied for the first time by simultaneous addition of O3 and PAC system. Synergy and catalysis improved the removals and specific degradation rates of MPs in the first minute of the treatment. Radical probing experiments showed that scavenging hydroxyl radicals (OH) did not have a significant impact on the removals, while scavenging other reactive oxygen species was more influential. A detailed study by electron paramagnetic resonance spectroscopy ascertained that the decomposition of ozone in presence of PAC at neutral pH did not boost the generation of free OH. Instead, adsorbed OH was likely produced as PAC–HO along with other oxidizing species resulting from adsorbed singlet oxygen and superoxide radicals. [Display omitted] •13 micropollutants studied for the first time by simultaneous PAC and O3 addition•Combining PAC and O3 improved the removal of O3-resistant MPs.•High MPs' removals achieved in a very short reaction time•Different ROS contributed to the MPs' removal, the role of free OH was subtle.