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Degradation of sulfachloropyridazine by UV-C/persulfate: kinetics, key factors, degradation pathway

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Abstract

Antibiotics are frequently detected in water, which can pose a great threat to human health. In this paper, an ultraviolet/persulfate (UV-C/PS) advanced oxidation process was utilized to remove a common antibiotic sulfachloropyridazine (SCP) efficiently from groundwater. The degradation mechanism and kinetics were investigated by researching several key influencing factors, including two radical scavengers (tert-butanol and methyl alcohol), dosages of PS, initial pH, anions (H2PO4, HPO42−, Cl, HCO3 and NO3) and natural organic matter. The degradation of SCP followed a pseudo-first-order kinetic model and better degradation was achieved in acidic conditions than in alkaline conditions. The effect of scavengers indicated that both SO4˙ and HO˙ contributed to the degradation of SCP and SO4˙ played a major role. The degradation rate constants of SCP with SO4˙ and HO˙ at the initial pH of 6.3 were calculated to be kSCP,HO˙ = 0.867 × 109 M−1 s−1 and kSCP,SO4˙ = 3.073 × 109 M−1 s−1 in the UV-C/PS system by the relative rate method. Increasing the concentration of PS obviously facilitated the degradation and mineralization rates of SCP, which could reach 100% and 90%, respectively, at a PS dosage of 4.0 mM after 2 h. Also, H2PO4 and Cl promoted the degradation of SCP, whereas the removal of SCP was restrained by the addition of HPO42−, HCO3 and large dosages of NO3. The proposed degradation pathway of SCP was obtained by analyzing the intermediates.

Graphical abstract: Degradation of sulfachloropyridazine by UV-C/persulfate: kinetics, key factors, degradation pathway

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Supplementary files

Article information


Submitted
17 Mar 2020
Accepted
18 May 2020
First published
04 Jun 2020

Environ. Sci.: Water Res. Technol., 2020, Advance Article
Article type
Paper

Degradation of sulfachloropyridazine by UV-C/persulfate: kinetics, key factors, degradation pathway

J. Dan, Q. Wang, K. Mu, P. Rao, L. Dong, X. Zhang, Z. He, N. Gao and J. Wang, Environ. Sci.: Water Res. Technol., 2020, Advance Article , DOI: 10.1039/D0EW00239A

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