Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 403, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123591
Keywords
Oxybenzone; UV-AOP; radicals; byproducts; toxicity
Categories
Funding
- Korea Environment Industry & Technology Institute (KEITI) - Korea Ministry of Environment (MOE) [2019002710001]
- National Research Foundation of Korea [5199990214126] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The study revealed that the UV/PS reaction is more efficient in degrading BP3 in water compared to the UV/H2O2 reaction, with degradation efficiency increasing with higher dosage of H2O2 and persulfate. BP3 degradation primarily occurs at pH 6 and is influenced by water components such as HCO3-, NO3-, Cl-, Br- ions, as well as humic acid.
The degradation of benzophenone-3 (BP3) in water via the UV/H2O2 and UV/persulfate (UV/PS) reactions was investigated. The degradation of BP3 exhibited pseudo-first-order kinetics in both reactions. The degradation efficiency of BP3 was higher in the UV/PS reaction than in the UV/H2O2 reaction. In both reactions, the observed rate constants (k(obs)) of BP3 degradation were highest at pH 6 and increased linearly with increasing dosage of H2O2 and persulfate. The second-order rate constants of BP3 with center dot OH (k center dot(OH_BP3)) and center dot SO4- (k(center dot SO4_BP3)) were determined to be 1.09 (+/- 0.05) x 1010 and 1.67 (+/- 0.04) x 10(9) M-1 s(-1), respectively. The kobs values of BP3 were affected by water components such as HCO3-, NO3-, Cl-, and Br- ions, as well as humic acid. Based on the identified transformation products (TPs), the degradation pathway of BP3 during both reactions was a hydroxylation reaction. The inhibition of bioluminescence in Vibrio fischeri due to BP3 and its TPs decreased more quickly in the UV/PS reaction than in the UV/H2O2 reaction. The results suggest that the UV/PS process is a better alternative to the UV/H2O2 process for removing BP3 and its toxicity in water.
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