Degradation of Paracetamol by an UV/Chlorine Advanced Oxidation Process: Influencing Factors, Factorial Design, and Intermediates Identification

Yen Hai Dao, Hai Nguyen Tran, Thien Thanh Tran-Lam, Trung Quoc Pham and Giang Truong Le
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Yen Hai Dao: Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi 100000, Vietnam
Hai Nguyen Tran: Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
Thien Thanh Tran-Lam: Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi 100000, Vietnam
Trung Quoc Pham: Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi 100000, Vietnam
Giang Truong Le: Institute of Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi 100000, Vietnam

IJERPH, 2018, vol. 15, issue 12, 1-18

Abstract: The combination of a low-pressure mercury lamp and chlorine (UV/chlorine) was applied as an emerging advanced oxidation process (AOP), to examine paracetamol (PRC) degradation under different operational conditions. The results indicated that the UV/chlorine process exhibited a much faster PRC removal than the UV/H 2 O 2 process or chlorination alone because of the great contribution of highly reactive species ( • OH, • Cl, and ClO • ). The PRC degradation rate constant ( k obs ) was accurately determined by pseudo-first-order kinetics. The k obs values were strongly affected by the operational conditions, such as chlorine dosage, solution pH, UV intensity, and coexisting natural organic matter. Response surface methodology was used for the optimization of four independent variables (NaOCl, UV, pH, and DOM). A mathematical model was established to predict and optimize the operational conditions for PRC removal in the UV/chlorine process. The main transformation products (twenty compound structures) were detected by liquid chromatography coupled to high-resolution mass spectrometry (LC-HRMS).

Keywords: paracetamol; UV/chlorine; reaction kinetics; response surface methodology; transformation products (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2018
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