Key Laboratory of Industrial Pollution Control and Resource Reuse of Jiangsu Province, College of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221018, China.
Key Laboratory of Industrial Pollution Control and Resource Reuse of Jiangsu Province, College of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221018, China.
Sci Total Environ. 2021 Jun 1;771:145451. doi: 10.1016/j.scitotenv.2021.145451. Epub 2021 Jan 28.
Tire wear particles (TWP), as the significant proportion of microplastics (MPs), has adsorbed much attention due to its widespread presence in aquatic ecosystem. However, compared with traditional MPs, few studies have investigated the interaction between TWP and coexisting contaminants. The adsorption-desorption behavior of chlortetracycline (CTC) and amoxicillin (AMX) by original and aged TWP was studied, and polyethylene (PE) was studied for comparison. After aging, small holes and cracks were produced on the surfaces of the TWP and PE. Meanwhile, the specific surface areas (S) of TWP and PE increased, but the aged TWP had a larger S than the aged PE, which indicated that TWP was more likely to degrade than PE. The adsorption kinetics results showed that the adsorption of CTC and AMX by TWP and PE conformed to the pseudo-second-order model. The adsorption isotherm results showed that the Freundlich model could describe the adsorption isotherm data of TWP and PE. The adsorption capacity of antibiotics by TWP increased by 1.13-23.40 times, and by 1.08-14.24 times on PE, after aging. Desorption experiments showed that the desorption amount of antibiotics on TWP and PE in simulated gastric fluid was greater than that in ultrapure water. The desorption amount and rate of CTC and AMX from TWP were higher than those of PE, indicating that TWP might be more harmful to the aquatic environment and organisms. These findings indicated that, compared with PE, TWP might have stronger carrier effects on antibiotics, which might pose more serious potential risks to the aquatic environment and organisms, especially considering the effects of the aging process. This study would expand the research on environmental risk of MPs and contribute to providing new insights into the evaluation of tire material particles.
轮胎磨损颗粒（Tire wear particles，TWP）作为微塑料（Microplastics，MPs）的重要组成部分，因其广泛存在于水生生态系统中而备受关注。然而，与传统 MPs 相比，很少有研究探讨 TWP 与共存污染物之间的相互作用。本研究以原始 TWP 和老化 TWP 为研究对象，研究了其对氯四环素（Chlortetracycline，CTC）和阿莫西林（Amoxicillin，AMX）的吸附-解吸行为，并以聚乙烯（Polyethylene，PE）为对比。老化后，TWP 和 PE 的表面出现了小孔和裂纹，同时，TWP 和 PE 的比表面积（Specific surface areas，S）增加，但老化 TWP 的 S 大于老化 PE，表明 TWP 比 PE 更容易降解。吸附动力学结果表明，CTC 和 AMX 在 TWP 和 PE 上的吸附均符合准二级动力学模型。吸附等温线结果表明，Freundlich 模型能够描述 TWP 和 PE 的吸附等温线数据。老化后，TWP 和 PE 对抗生素的吸附容量分别增加了 1.13-23.40 倍和 1.08-14.24 倍。解吸实验表明，TWP 和 PE 上抗生素在模拟胃液中的解吸量大于在超纯水中的解吸量。TWP 上 CTC 和 AMX 的解吸量和速率均高于 PE，表明 TWP 可能对水生环境和生物更有害。这些发现表明，与 PE 相比，TWP 可能对抗生素具有更强的载体效应，这可能对水生环境和生物构成更严重的潜在风险，特别是考虑到老化过程的影响。本研究拓展了 MPs 环境风险研究，为轮胎材料颗粒的评价提供了新的见解。
