陈经纶, 李烨, 黄国琼, 于飞. 不同粒径海洋微塑料对左氧氟沙星的吸附行为研究[J]. 海洋环境科学, 2022, 41(3): 331-340. DOI: 10.12111/j.mes2021-x-0043
引用本文: 陈经纶, 李烨, 黄国琼, 于飞. 不同粒径海洋微塑料对左氧氟沙星的吸附行为研究[J]. 海洋环境科学, 2022, 41(3): 331-340. DOI: 10.12111/j.mes2021-x-0043
CHEN Jing-lun, LI Ye, HUANG Guo-qiong, YU Fei. Adsorption behavior of levofloxacin onto marine microplastics with different particle sizes[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2022, 41(3): 331-340. DOI: 10.12111/j.mes2021-x-0043
Citation: CHEN Jing-lun, LI Ye, HUANG Guo-qiong, YU Fei. Adsorption behavior of levofloxacin onto marine microplastics with different particle sizes[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2022, 41(3): 331-340. DOI: 10.12111/j.mes2021-x-0043

不同粒径海洋微塑料对左氧氟沙星的吸附行为研究

Adsorption behavior of levofloxacin onto marine microplastics with different particle sizes

  • 摘要: 微塑料(MPs)在各种环境介质中长期迁移与运输的过程中,容易与多种污染物形成复合污染的环境问题。针对该问题,本研究选取聚甲基丙烯酸甲酯(PMMA)作为MPs代表,以左氧氟沙星(LEV)为抗生素代表,通过批量吸附实验研究了PMMA对LEV的吸附行为,并探讨了多种环境因素对吸附行为的影响。研究结果表明,PMMA对LEV的吸附动力学过程符合拟二阶动力学模型,且其吸附速率受颗粒内部扩散和外部扩散的共同影响,吸附过程以物理吸附为主。5种不同粒径的PMMA对LEV的富集能力为:1 μm>75 μm>125 μm>250 μm>500 μm。海水实际环境对PMMA吸附LEV能力呈显著的抑制作用,仅为模拟淡水环境的14.5%,离子强度、腐殖酸等环境因素均对吸附行为产生一定程度的影响。该研究可为MPs与抗生素的表界面行为研究提供理论支持,为环境中新兴污染物的复合污染问题提供理论指导与研究依据。

     

    Abstract: Microplastics (MPs) are prone to form compound pollution problems with multiple pollutants during the long-term migration and transportation of various environmental media. In response to this problem, this study selected polymethyl methacrylate (PMMA) as the representative of MPs, and levofloxacin (LEV) as the representative of antibiotics. Batch adsorption experiments were carried out to study the adsorption behavior of LEV onto PMMA, and the influence of various environmental factors on its adsorption behavior was discussed. Research results show that the adsorption kinetic process of LEV onto PMMA conforms to the pseudo-second-order model. The adsorption rate is affected by both internal and external diffusion. The adsorption process is mainly physical adsorption. The enrichment capacity of LEV onto PMMA with five different particle sizes is as follows: 1 μm>75 μm>125 μm>250 μm>500 μm. The actual seawater environment has a significant inhibitory effect on adsorption capacity of LEV onto PMMA, which is only 14.5% of the simulated freshwater environment. Environmental factors such as ionic strength, humic acid both have a certain degree of influence on adsorption behavior. This study can provide theoretical support for the research of interface behavior of antibiotics by MPs, and provide theoretical guidance and research basis for the compound pollution of emerging pollutants in the environment.

     

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