Li Xiang, Jiang Huating, Zhu Liya, Tang Junqian, Liu Zhihua, Dai Yingjie
College of Resources and Environment, Northeast Agricultural University, No.600 Changjiang Road, Xiangfang District, Harbin, 150030, China.
College of Resources and Environment, Northeast Agricultural University, No.600 Changjiang Road, Xiangfang District, Harbin, 150030, China; School of Environmental Science and Engineering, Huazhong University of Science & Technology, Wuhan, 430074, China.
Chemosphere. 2024 Mar;351:141181. doi: 10.1016/j.chemosphere.2024.141181. Epub 2024 Jan 9.
Microplastics (MPs) are increasingly contaminating the environment and they can combine with antibiotics as carriers to form complex contaminants. In this study, we systematically investigated the interactions between the antibiotic enrofloxacin (ENR) and MPs comprising polyethylene (PE), polyvinyl chloride (PVC), and polystyrene (PS). Characterization was performed by using conventional techniques and the mechanisms involved in interactions were initially explored based on adsorption kinetics, isotherms, and resolution experiments, and the adsorption capacities of the MPs were determined. In addition, the extended Derjaguin-Landau-Verwey-Overbeek theory was used to investigate the interaction mechanisms. The results showed that the interactions were weaker in strong acidic and alkaline environments, and the interactions were also inhibited at higher salt ion concentrations. The saturation adsorption amounts of ENR on PVC, PE, and PS were 74.63 μg/g, 103.09 μg/g, and 142.86 μg/g, respectively. The interactions between MPs and ENR were dominated by hydrophobic interactions, followed by van der Waals forces and acid-base forces. This study provides new insights into the adsorption behavior of ENR by MPs.
微塑料（MPs）对环境的污染日益严重，并且它们可以作为载体与抗生素结合形成复合污染物。在本研究中，我们系统地研究了抗生素恩诺沙星（ENR）与由聚乙烯（PE）、聚氯乙烯（PVC）和聚苯乙烯（PS）组成的微塑料之间的相互作用。采用常规技术进行表征，并基于吸附动力学、等温线和解析实验初步探索了相互作用的机制，同时测定了微塑料的吸附容量。此外，运用扩展的Derjaguin-Landau-Verwey-Overbeek理论研究了相互作用机制。结果表明，在强酸性和碱性环境中相互作用较弱，在较高盐离子浓度下相互作用也受到抑制。ENR在PVC、PE和PS上的饱和吸附量分别为74.63μg/g、103.09μg/g和142.86μg/g。微塑料与ENR之间的相互作用以疏水相互作用为主，其次是范德华力和酸碱力。本研究为微塑料对ENR的吸附行为提供了新的见解。
