State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, PR China.
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, PR China.
Sci Total Environ. 2024 Jun 20;930:172511. doi: 10.1016/j.scitotenv.2024.172511. Epub 2024 Apr 17.
The co-occurrence of nanoplastics (NPs) and antibiotics in the environment is a growing concern for ecological safety. As NPs age in natural environments, their surface properties and morphology may change, potentially affecting their interactions with co-contaminants such as antibiotics. It is crucial to understand the effect of aging on NPs adsorption of antibiotics, but detailed studies on this topic are still scarce. The study utilized the photo-Fenton-like reaction to hasten the aging of polystyrene nanoplastics (PS-NPs). The impact of aging on the adsorption behavior of norfloxacin (NOR) was then systematically examined. The results showed a time-dependent rise in surface oxygen content and functional groups in aged PS-NPs. These modifications led to noticeable physical changes, including increased surface roughness, decreased particle size, and improved specific surface area. The physicochemical changes significantly increased the adsorption capacity of aged PS-NPs for norfloxacin. Aged PS-NPs showed 5.03 times higher adsorption compared to virgin PS-NPs. The adsorption mechanism analysis revealed that in addition to the electrostatic interactions, van der Waals force, hydrogen bonding, π-π* interactions and hydrophobic interactions observed with virgin PS-NPs, aged PS-NPs played a significant role in polar interactions and pore-filling mechanisms. The study highlights the potential for aging to worsen antibiotic risk in contaminated environments. This study not only enhances the comprehension of the environmental behavior of aged NPs but also provides a valuable basis for developing risk management strategies for contaminated areas.
纳米塑料（NPs）和抗生素在环境中的共存是生态安全的一个日益关注的问题。随着 NPs 在自然环境中老化，其表面性质和形态可能会发生变化，从而可能影响它们与抗生素等共存污染物的相互作用。了解老化对 NPs 吸附抗生素的影响至关重要，但关于这一主题的详细研究仍然很少。本研究利用类芬顿光化学反应加速聚苯乙烯纳米塑料（PS-NPs）的老化。然后系统地研究了老化对诺氟沙星（NOR）吸附行为的影响。结果表明，老化 PS-NPs 的表面氧含量和官能团随时间呈上升趋势。这些修饰导致了明显的物理变化，包括表面粗糙度增加、粒径减小和比表面积增大。这些物理化学变化显著提高了老化 PS-NPs 对诺氟沙星的吸附能力。与原始 PS-NPs 相比，老化 PS-NPs 的吸附量增加了 5.03 倍。吸附机制分析表明，除了原始 PS-NPs 观察到的静电相互作用、范德华力、氢键、π-π*相互作用和疏水相互作用外，老化 PS-NPs 还在极性相互作用和孔填充机制中起重要作用。该研究强调了老化可能会加剧污染环境中抗生素的风险。本研究不仅增强了对老化 NPs 环境行为的理解，还为制定污染地区的风险管理策略提供了有价值的基础。
