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The structural transformation reversibility of biogas slurry derived dissolved organic matter and its binding properties with norfloxacin under temperature fluctuation

文献类型： 外文期刊

作者： Fan, Jinluo 1 ; Ge, Chengjun 1 ; Li, Ailing 1 ; Ren, Guoliang 1 ; Deng, Hui 1 ; Wu, Dongming 5 ; Luo, Jiwei 1 ; He, Yanhu 2 ; Zhao, Yuanyuan 1 ; Li, Jiatong 1 ; Feng, Dan 1 ; Yu, Huamei 1 ;

作者机构： 1.Hainan Univ, Key Lab Agroforestry Environm Proc & Ecol Regulat, Haikou 570228, Peoples R China

2.Guangdong Univ Technol, Inst Environm & Ecol Engn, Guangdong Prov Key Lab Water Qual Improvement & Ec, Guangzhou 510006, Peoples R China

3.Hainan Univ, Ctr Ecoenvironm Restorat Engn Hainan Prov, Haikou 570228, Peoples R China

4.Hainan Univ, Key Lab Environm Toxicol, Minist Educ, Haikou 570228, Peoples R China

5.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Hainan Key Lab Trop Ecocirculing Agr, Haikou 571101, Peoples R China

6.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Minist Key Lab Low Carbon Green Agr Trop Reg China, Haikou 571101, Peoples R China

关键词： DOM; Antibiotic; Structural transformation; Temperature; Spectral analysis; 2D-COS

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.8； 五年影响因子：6.9 ）

ISSN： 0147-6513

年卷期： 2024 年 271 卷

页码：

收录情况： SCI

摘要： The widespread use of biogas slurry could potentially raise the environmental risk of antibiotics. Dissolved organic matter (DOM), as the most active part of biogas slurry, was able to interact with antibiotics and play a crucial role in the structure and function of soil and aquatic ecosystems. The recent shifts in global climate patterns have garnered significant attention due to their substantial impact on temperature, thereby exerting a direct influence on the characteristics of DOM and subsequently on the environmental behavior of antibiotics. However, there is limited research concerning the impact of temperature on the binding of DOM and antibiotics. Thus, this study aimed to explore the temperature-dependent structural transformation and driving factors of biogas slurry-derived DOM (BSDOM). Additionally, the binding characteristics between BSDOM and the commonly used antibiotic norfloxacin (NOR) at different temperatures were studied by using multi spectroscopic methods and two-dimensional correlation spectroscopy (2D-COS) analysis. The results suggested that the temperature-dependent structural transformation of BSDOM was reversible, with a slight lag in the transition temperature under cooling (13 degrees C for heating and 17 degrees C for cooling). Heating promoted the conversion of protein-like to humic-like substances while cooling favored the decomposition of humic-like substances. BSDOM and NOR were static quenching, with oxygen-containing functional groups such as C-O and -OH playing an important role. Temperature influenced the order of binding, the activity of the protein fraction, and its associated functional groups. At temperatures of 25 degrees C and 40 degrees C, the fluorescent components were observed to exhibit consistent binding preferences, whereby the humic-like component demonstrated a greater affinity for NOR compared to the protein-like component. However, the functional group binding order exhibited an opposite trend. At 10 degrees C, a new protein-like component appeared and bound preferentially to NOR, when no C-O stretch corresponding to the amide was observed. The finding will contribute to a comprehensive understanding of the interaction mechanisms between DOM and antibiotics under climate change, as well as providing a theoretical basis to reduce the environmental risks of biogas slurry and antibiotics.

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