Zahmatkesh Anbarani Mohaddeseh, Najafpoor Aliasghar, Barikbin Behnam, Bonyadi Ziaeddin
Student Research Committee, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Environmental Health Engineering, School of Health, Mashhad University of Medical Sciences, Mashhad, Iran.
Sci Rep. 2023 Oct 20;13(1):17989. doi: 10.1038/s41598-023-44288-z.
Microplastics (MPs), as carriers of organic pollutants in the environment, have become a growing public concern in recent years. Tetracycline (TTC) is an antibiotic that can be absorbed by MPs and have a harmful effect on human health. Therefore, this study was conducted with the aim of investigating the adsorption rate of TTC onto polyvinyl chloride (PVC) MPs. In addition, the adsorption mechanism of this process was studied using isothermal, kinetic, and thermodynamic models. For this purpose, experimental runs using the Box-Behnken model were designed to investigate the main research parameters, including PVC dose (0.5-2 g/L), reaction time (5-55 min), initial antibiotic concentration (5-15 mg/L), and pH (4-10). Based on the research findings, the highest TTC adsorption rate (93.23%) was obtained at a pH of 10, a contact time of 55 min, an adsorbent dose of 1.25 g/L, and an antibiotic concentration of 10 mg/L. The study found that the adsorption rate of TTC followed the pseudo-second-order and Langmuir models. Thermodynamic data indicated that the process was spontaneous, exothermic, and physical. Increasing ion concentration decreased TTC adsorption, and distilled water had the highest adsorption, while municipal wastewater had the lowest adsorption. These findings provide valuable insights into the behavior of MPs and organic pollutants, underscoring the importance of conducting additional research and implementing measures to mitigate their detrimental effects on human health and the environment.
微塑料（MPs）作为环境中有机污染物的载体，近年来已成为日益受到公众关注的问题。四环素（TTC）是一种抗生素，可被微塑料吸附并对人类健康产生有害影响。因此，本研究旨在调查四环素在聚氯乙烯（PVC）微塑料上的吸附率。此外，使用等温、动力学和热力学模型研究了该过程的吸附机制。为此，设计了使用Box-Behnken模型的实验运行，以研究主要研究参数，包括PVC剂量（0.5-2 g/L）、反应时间（5-55分钟）、初始抗生素浓度（5-15 mg/L）和pH值（4-10）。根据研究结果，在pH值为10、接触时间为55分钟、吸附剂剂量为1.25 g/L和抗生素浓度为10 mg/L时，获得了最高的四环素吸附率（93.23%）。研究发现，四环素的吸附率符合准二级和朗缪尔模型。热力学数据表明，该过程是自发的、放热的和物理的。离子浓度的增加会降低四环素的吸附，蒸馏水的吸附率最高，而城市废水的吸附率最低。这些发现为微塑料和有机污染物的行为提供了有价值的见解，强调了开展更多研究和采取措施减轻它们对人类健康和环境的有害影响的重要性。
