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Effect of the molecular weight of DOM on the indirect photodegradation of fluoroquinolone antibiotics

文献类型： 外文期刊

作者： Liu, Shukai 1 ; Cui, Zhengguo 1 ; Ding, Dongsheng 1 ; Bai, Ying 1 ; Chen, Jianlei 1 ; Cui, Hongwu 3 ; Su, Rongguo 3 ; Qu, Keming 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Shandong, Peoples R China

2.Lab Marine Fisheries Sci & Food Prod Proc, Laoshan Lab, Qingdao 266071, Shandong, Peoples R China

3.Ocean Univ China, Key Lab Marine Chem Theory & Technol, Minist Educ, Qingdao 266100, Peoples R China

关键词： Dissolved organic matter; Molecular weight; Optical properties; Fluoroquinolone antibiotics; Indirect photodegradation

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.7； 五年影响因子：8.4 ）

ISSN： 0301-4797

年卷期： 2023 年 348 卷

页码：

收录情况： SCI

摘要： Dissolved organic matter (DOM) is ubiquitous and widespread in natural water and influences the transformation and removal of antibiotics. Nevertheless, the influence of DOM molecular weight (MW) on the indirect photodegradation of antibiotics has rarely been reported. This study attempted to explore the influence of the molecular weight of DOM on the indirect photodegradation of two fluoroquinolone antibiotics (FQs), ofloxacin (OFL) and norfloxacin (NOR), by using UV-vis absorption and fluorescence spectroscopy. The results showed that indirect photodegradation was considered the main photodegradation pathway of FQs in DOM fractions. Triplet-state excited organic matter ((DOM)-D-3*) and singlet oxygen (O-1(2)) were the main reactive intermediates (RIs) that affected the indirect photodegradation of FQs. The indirect photodegradation rate of FQs was significantly promoted in DOM fractions, especially in the low molecular weight DOM fractions (L-MW DOM, MW < 10 kDa). The results of excitation-emission matrix spectroscopy combined with parallel factor analysis (EEM-PARAFAC) showed that terrestrial humic-like substances had a higher humification degree and fluorophore content in L- MW DOM fractions, which could produce more (DOM)-D-3* and O-1(2) to promote the indirect photodegradation of FQs. This study provided new insight into the effects of DOM at the molecular weight level on the indirect photodegradation of antibiotics in natural water.

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