Kinetic constants and transformation products of ornidazole during ozonation

被引:0
作者
Fan S. [1 ]
Xu H. [1 ]
Zhang Q. [1 ]
Xu A. [1 ]
Geissen S.U. [2 ]
Lebedev A.T. [3 ]
Zhang Y. [1 ]
机构
[1] School of Environmental Science and Engineering, Nanjing Tech University, Nanjing
[2] Technische Universität Berlin, Chair of Environmental Process Engineering, Sekr. KF2, Strasse des 17. Juni 135, Berlin
[3] Department of Organic Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow
基金
中国国家自然科学基金;
关键词
Antibiotics; Catalytic ozonation; Ecotoxicity; Pharmaceutical; QSAR; Toxicity;
D O I
10.1016/j.chemosphere.2023.140783
中图分类号
学科分类号
摘要
Ornidazole (ONZ), a nitroimidazole antibiotic detected in water bodies, may negatively impact the aquatic ecosystem. Its reaction kinetics during ozonation which is a feasible and applicable technology to control the contamination of emerging contaminants, however, has not been reported in literature. In this study, we measured the apparent second-order kinetic constant of ONZ with ozone molecules via the excessive ozone method and the competing method which led to an average value of 103.8 ± 2.7 M−1 s−1 at pH 7. The apparent second-order kinetic constant of ONZ with HO• was calculated to be 4.65 × 109 M−1 s−1 with the concept of Rct measured via para-chlorobenzoic acid as a probe. The transformation products (TPs) of ONZ during ozonation at pH 3 and pH 11 were separately analyzed with HPLC-MS/MS and some unique products were found at pH 11, reflecting the influence of HO•. The toxicity of individual TPs was predicted with the tool of T.E.S.T. It was found that 62% of 21 identified TPs could be more toxic than ONZ in terms of at least one acute toxicity endpoint, including chlorinated amines and N-oxides. The analysis with a respirometer further revealed that the toxicity of mixing TPs generated at HO• rich conditions was slightly lower than O3 dominated conditions. In general, this study provides the basic kinetic data for designing ozonation processes to eliminate ONZ and the important reference for understanding the toxicity evolution of ONZ during ozonation. © 2023 Elsevier Ltd
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