| Autor: |
Ahn YY; Korea Polar Research Institute (KOPRI), Incheon, 21990, Republic of Korea., Kim K; Korea Polar Research Institute (KOPRI), Incheon, 21990, Republic of Korea; Department of Polar Science, University of Science of Technology (UST), Incheon, 21990, Republic of Korea. Electronic address: ktkim@kopri.re.kr. |
| Jazyk: |
angličtina |
| Zdroj: |
Chemosphere [Chemosphere] 2024 Nov; Vol. 367, pp. 143629. Date of Electronic Publication: 2024 Oct 28. |
| DOI: |
10.1016/j.chemosphere.2024.143629 |
| Abstrakt: |
The purification of bromate (BrO 3 - )-contaminated water has become a challenge because of its persistence and adverse effects. Furthermore, there has been concern over the release of byproducts, such as diphenyl phosphate (DPHP), from flame retardants in wastewater treatment plant (WWTP). In this study, we designed the water treatment system for the oxidation of DPHP accompanied by bromate (BrO 3 - ) reduction via freezing the solution. A sample containing 10 μM DPHP, 100 μM Br - , and 50 μM BrO 3 - , with a pH of 3 was frozen at -20 o C, approximately 25 μM BrO 3 - was reduced, and DPHP was fully eliminated after a 0.5 h reaction time. Conversely, these reactions did not advance in water at 20 o C. This increase in the rate of chemical reaction in ice is the consequence of the freeze concentration effect, which refers to the extraction of dissolved chemical species into the liquid-like regions of the polycrystalline ice micro-structure during the freezing of the solution. The redox reactions among DPHP, Br - , and BrO 3 - become thermodynamically favorable due to the distinctive environment in the liquid brine in ice. The efficiency of the DPHP oxidation significantly increased with an increase in BrO 3 - concentration, and vice versa. The Br - /BrO 3 - -induced HOBr production is proposed as a primary oxidant for DPHP degradation. The proton activity (pH) has a significant influence on the reaction efficiency. The low freezing temperature accelerated the reaction kinetics of DPHP degradation and BrO 3 - reduction. The results of this study indicate the possibility of utilizing ice chemistry for the BrO 3 - reduction that concomitantly removes DPHP for water treatment. This environmentally friendly water treatment method can be considered to implement in regions with a cold climate.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.) |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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