Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 23, Issue 3, Pages 2848-2855Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-015-5524-1
Keywords
Oxcarbazepine; Kinetics; Oxidation; Sulfate radical; Pathway
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Funding
- Central University Basic Scientific Research Business [531107040812]
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The degradation kinetics and mechanism of the antiepileptic drug oxcarbazepine (OXC) by UV-activated persulfate oxidation were investigated in this study. Results showed that UV/persulfate (UV/PS) process appeared to be more effective in degrading OXC than UV or PS alone. The OXC degradation exhibited a pseudo-first order kinetics pattern and the degradation rate constants (k (obs)) were affected by initial OXC concentration, PS dosage, initial pH, and humic acid concentration to different degrees. It was found that low initial OXC concentration, high persulfate dosage, and initial pH enhanced the OXC degradation. Additionally, the presence of humic acid in the solution could greatly inhibit the degradation of OXC. Moreover, hydroxyl radical (OHaEuro cent) and sulfate radical (SO4 (-)aEuro cent aEuro cent) were identified to be responsible for OXC degradation and SO4 (-)aEuro cent made the predominant contribution in this study. Finally, major intermediate products were identified and a preliminary degradation pathway was proposed. Results demonstrated that UV/PS system is a potential technology to control the water pollution caused by emerging contaminants such as OXC.
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