Version 1
: Received: 26 April 2024 / Approved: 27 April 2024 / Online: 28 April 2024 (07:48:49 CEST)
How to cite:
Ioannidis, I.; Kinigopoulou, V.; Anastopoulos, I.; Giannakoudakis, D.A.; Pashalidis, I. The Interaction of Two Emerging Pollutants, Radionuclides and Microplastics: In-Depth Thermodynamic Studies in Water, Seawater, and Wastewater. Preprints2024, 2024041795. https://doi.org/10.20944/preprints202404.1795.v1
Ioannidis, I.; Kinigopoulou, V.; Anastopoulos, I.; Giannakoudakis, D.A.; Pashalidis, I. The Interaction of Two Emerging Pollutants, Radionuclides and Microplastics: In-Depth Thermodynamic Studies in Water, Seawater, and Wastewater. Preprints 2024, 2024041795. https://doi.org/10.20944/preprints202404.1795.v1
Ioannidis, I.; Kinigopoulou, V.; Anastopoulos, I.; Giannakoudakis, D.A.; Pashalidis, I. The Interaction of Two Emerging Pollutants, Radionuclides and Microplastics: In-Depth Thermodynamic Studies in Water, Seawater, and Wastewater. Preprints2024, 2024041795. https://doi.org/10.20944/preprints202404.1795.v1
APA Style
Ioannidis, I., Kinigopoulou, V., Anastopoulos, I., Giannakoudakis, D.A., & Pashalidis, I. (2024). The Interaction of Two Emerging Pollutants, Radionuclides and Microplastics: In-Depth Thermodynamic Studies in Water, Seawater, and Wastewater. Preprints. https://doi.org/10.20944/preprints202404.1795.v1
Chicago/Turabian Style
Ioannidis, I., Dimitrios A. Giannakoudakis and Ioannis Pashalidis. 2024 "The Interaction of Two Emerging Pollutants, Radionuclides and Microplastics: In-Depth Thermodynamic Studies in Water, Seawater, and Wastewater" Preprints. https://doi.org/10.20944/preprints202404.1795.v1
Abstract
Microplastics and radionuclides pose significant challenges to the sustainable management of water systems. The interaction of uranium-232 and americium-241 with polyurethane (PU) and polylactic acid (PLA) microplastics has been investigated in aqueous laboratory and environ-mental solutions (e.g., seawater and wastewater) as a function of temperature in various pH (4, 7, 9). The temperature increase affects positively the binding of uranium-232 and americium-241. The highest adsorption efficiency for uranium and americium is observed at the neutral and al-kaline pH region, respectively. In environmental water samples (pH ~8) the adsorption efficiency decreases significantly due to the competitive adsorption of other metals present in natural wa-ters (e.g., Ca2+) as well as the stabilization of the actinides (particularly uranium) in solution (e.g., UO2(CO3)34-). The solution composition which governs both the actinide speciation, and the type of surface-active sites is strongly associated with the surface adsorption thermodynamics and de-termines the values of the associated parameters (ΔΗo and ΔSo). Generally, the values of ΔΗo and ΔSo are positive indicating an entropy-driven reaction. However, in the case of the U(VI) adsorp-tion by PLA in seawater samples both ΔΗo and ΔSo values become negative suggesting an enthal-py-driven binding mechanism associated with a decline in randomness at the surface upon ad-sorption.
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
,
