Degradation of bisphenol A and S in wastewater during cold atmospheric pressure plasma treatment

Kovačič, Ana, Modic, Martina, Hojnik, Nataša, Vehar, Anja, Kosjek, Tina, Heath, David, Walsh, James L ORCID: 0000-0002-6318-0892, Cvelbar, Uroš and Heath, Ester
(2022) Degradation of bisphenol A and S in wastewater during cold atmospheric pressure plasma treatment. Science of The Total Environment, 837. p. 155707.

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Developing novel, fast and efficient ecologically benign processes for removing organic contaminants is important for the continued development of water treatment. For this reason, this study investigates the implementation of Cold Atmospheric pressure Plasma (CAP) generated in ambient air as an efficient tool for the removal of Bisphenol A (BPA) and Bisphenol S (BPS)-known endocrine disrupting compounds in water and wastewater, by monitoring degradation kinetics and its transformation products. The highest removal efficiencies of BPA (>98%) and BPS (>70%) were obtained after 480 s of CAP exposure. A pseudo-first-order kinetic revealed that BPA (-k<sub>t</sub> = 4.4 ̶ 9.0 ms<sup>-1</sup>) degrades faster than BPS (-k<sub>t</sub> = 0.4 ̶ 2.4 ms<sup>-1</sup>) and that the degradation is also time- and CAP power-dependent, while the initial concentration or matrix type had a negligible effect. This study also tentatively identified three previously reported and one novel transformation product of BPA and four novel transformation products of BPS. Their postulated structures suggested similar breakdown mechanisms, i.e., hydroxylation followed by ring cleavage. The results demonstrate that CAP technology is an effective process for the degradation of both BPA and BPS without the need for additional chemicals, indicating that CAP is a promising technology for water and wastewater remediation worthy of further investigation and optimization.

Item Type: Article
Uncontrolled Keywords: Cold atmospheric pressure plasma, Bisphenol, Degradation kinetics, Transformation products, Removal efficiency, Water treatment
Divisions: Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User: Symplectic Admin
Date Deposited: 18 May 2022 09:43
Last Modified: 18 Jan 2023 21:01
DOI: 10.1016/j.scitotenv.2022.155707
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