| Kinetics and degradation mechanism of tris (1-chloro-2-propyl) phosphate in the UV/H2O2 reaction | |
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| 년도 | 2020 |
| 날짜 | 2020 Dec |
| 페이지 / 학회지명 |
260, 127461 / Chemosphere |
| 논문저자 | Yeongjo Son 1, Young-Min Lee 2, Kyung-Duk Zoh 3 |
| Link |
https://www.sciencedirect.com/science/article/abs/pii/S004565352031655…
101회 연결
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1 Department of Environmental Health Sciences, Institute of Health & Environment, School of Public Health, Seoul National University, Seoul, 08826, South Korea. 2 Institute of Health and Environment, Seoul National University, Seoul, South Korea. 3 Department of Environmental Health Sciences, Institute of Health & Environment, School of Public Health, Seoul National University, Seoul, 08826, South Korea; Institute of Health and Environment, Seoul National University, Seoul, South Korea. Electronic address: zohkd@snu.ac.kr. Abstract Tris (1-chloro-2-propyl) phosphate (TCPP) is a chlorinated organic phosphate used in various applications as a flame retardant and plasticizer. TCPP is a known suspected carcinogen and is not effectively removed by traditional water treatments such as biological, chlorination, and UV irradiation. In this study, the UV/H2O2 reaction was employed to degrade TCPP in water. TCPP was effectively degraded in the UV/H2O2 reaction by pseudofirst-order kinetics. The second-order rate constant of the reaction between the TCPP and OH radical was determined to be 4.35 (±0.13) × 108 M-1 s-1 using the competition kinetics with nitrobenzene as a reference compound. The degradation of TCPP was affected by the amount of H2O2, pH, and coexisting water components such as HCO3-, NO3-, and humic acid. Approximately 64.2% of total organic carbon (TOC) in TCPP was mineralized in 12 h during the UV/H2O2 reaction, whereas chloride (Cl-) and phosphate (PO43-) ions were identified as ionic byproducts with the recoveries of 96% chlorine (Cl) and 50% phosphorus (P). Five organic transformation products (TPs) of TCPP were also identified using LC-qTOF/MS. Considering the identified TPs, the main degradation pathway of TCPP during the UV/H2O2 reaction was found to be OH-radical-induced hydroxylation. Finally, a 70% decrease in bioluminescence inhibition in Vibrio fischeri was observed during the UV/H2O2 reaction, and the time-toxicity profile was similar to the time-peak area profile of TPs. The result of this study implies that TCPP can be efficiently removed with significant mineralization and toxicity reduction by the UV/H2O2 process. Keywords: Mineralization.; OH radical; Organophosphate esters; Toxicity; Transformation products; UV/H(2)O(2). |
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