摘要
采用紫外光谱、红外光谱、荧光光谱及平行因子分析方法,探讨了四环素TC与3种不同来源(污泥、鸡粪、秸秆)水热炭溶解性有机质(DOM)之间的络合异质性及其作用机制.结果表明, 3种水热炭DOM均表现出较高的亲水性和较低的芳香性特征,其中秸秆水热炭DOM尽管具有较高的芳香性和较大的分子量,但其溶解性有机碳(DOC)含量较低且表面含氧官能团较为丰富;相反,污泥水热炭DOM拥有最高的DOC含量,但其芳香性和分子量均最低.3种水热炭DOM与TC之间的荧光猝灭均属于静态猝灭类型,其中污泥水热炭DOM和鸡粪水热炭DOM表现出显著的荧光猝灭效应,其络合常数lgK范围分别为4.48~5.81与5.94~6.33,络合容量f值范围分别为0.21~0.40与0.14~0.46.进一步分析显示,TC更倾向于与水热炭DOM中富含的类蛋白组分发生猝灭反应,其中鸡粪水热炭DOM与类蛋白组分C4络合常数lgK与络合容量值f分别为6.33与0.46为最高.不同来源的水热炭DOM与污染物TC之间存在差异化的络合效应,这将影响环境中TC的存在形态、迁移行为及其生物有效性.
Ultraviolet spectra,infrared spectra,and fluorescence spectroscopy with parallel factor analysis were used to explore the complexation heterogeneity and underlying mechanisms between tetracycline(TC)and dissolved organic matter(DOM)from hydrochars of three sources(i.e.,sludge,chicken manure,and straw).Results showed that all three hydrochar DOM types exhibited high hydrophilicity and low aromaticity.Among these,straw-derived hydrochar DOM showed relatively higher aromaticity and larger molecular weight,whereas it had lower dissolved organic carbon(DOC)content and richer surface oxygen-containing groups.In contrast,sludge-derived hydrochar DOM possessed the highest DOC content but the lowest aromaticity and molecular weight.The fluorescence quenching of the three hydrochar DOMs by TC was static quenching.Sludge-and chicken manure-derived hydrochar DOMs showed significant quenching effects.The complexation constants(lgK)ranged from 4.48to 5.81for sludge-derived hydrochar DOM and from 5.94 to 6.33 for chicken manure-derived hydrochar DOM,with corresponding capacities(f)of 0.21~0.40 and 0.14~0.46,respectively.Further analysis indicated that TC tended to quench the protein-like components in hydrochar DOM.The chicken manure-derived hydrochar DOM exhibited the strongest binding affinity with the protein-like component(C4),with the highest lgK of 6.33 and f of 0.46.The complexation effects between different source-derived hydrochar DOMs with TC varied,influencing the environmental occurrence,migration,and bioavailability of TC.
作者
史云龙
向海荣
谢慧芳
冯彦房
陈欢
王冰玉
SHI Yun-long;XIANG Hai-rong;XIE Hui-fang;FENG yan-fang;CHEN Huan;WANG Bing-yu(School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse,Nanjing University of Science and Technology,Nanjing 210094,China;Institute of Agricultural Resources and Environment,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China)
出处
《中国环境科学》
北大核心
2025年第8期4596-4607,共12页
China Environmental Science
基金
国家自然科学基金项目(42107398)
中国博士后科学基金项目(2020M68618)
低碳智能燃煤发电与超净排放全国重点实验室开放课题项目(课题编号D2023FK098)。
关键词
水热炭
溶解性有机质
络合作用
四环素
hydrochar
dissolved organic matter
complexation
tetracycline
