Fan Xiu-Lei, Zou Ye-Feng, Liu Jia-Qiang, Li Ying, Liu Qiang, Hou Jun
College of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221018, China.
Key Laboratory of Industrial Pollution Control and Resource Reuse of Jiangsu Province, Xuzhou 221018, China.
Huan Jing Ke Xue. 2021 Apr 8;42(4):1901-1912. doi: 10.13227/j.hjkx.202008179.
In recent years, microplastics (MPs), a new type of pollutant, have been widely dispersed in aquatic ecosystems. Compared with typical MPs (PVC, PP, PE, and PS), tire wear particles (TWP) exhibit significant differences in composition, additives, and characteristics. In this study, the adsorption and desorption of organic pollutants were compared between the typical MPs and TWP. With TWP and polyvinyl chloride (PVC) particles as adsorbents, oxytetracycline (OTC) and sulfamethoxazole (SMZ) as adsorbates, the adsorption and desorption of organic pollutants by TWP and PVC particles before and after aging were studied. Correctly understanding the behavior of MPs in an aquatic environment is of great significance. The results indicated that during the UV aging process, both TWP and PVC exhibited cracks, pits, and bulges on the particle surface, increased specific surface areas, increased strength of oxygen-containing functional groups, and enhanced hydrophilicity. The adsorption modes of TWP and PVC before and after aging were in two stages:surface adsorption and liquid film diffusion. TWP has a better fit for the Freundlich model, belonging to multi-layer adsorption, while PVC has a better fit for the Langmuir model, belonging to monolayer adsorption. The carrier effect of TWP on antibiotics was better than that of PVC, with the adsorption capacity of OTC on virgin TWP and PVC reaching 5.14 mg·g and 1.38 mg·g, respectively. Additionally, the adsorption capacity of OTC on the aged TWP and PVC reached 5.82 mg·g and 2.13 mg·g, respectively, which was better than with the virgin samples. The desorption capacity of aged TWP and PVC for antibiotics was better than the virgin materials, while the desorption rate was lower. In the same desorption solution, the desorption effect of TWP on antibiotics before and after ageing was better than that of PVC. The desorption effect of TWP and PVC on antibiotics in a simulated intestinal fluid environment was significantly better than that in an ultra-pure water environment.
近年来，微塑料（MPs）作为一种新型污染物，已广泛散布于水生生态系统中。与典型的微塑料（聚氯乙烯、聚丙烯、聚乙烯和聚苯乙烯）相比，轮胎磨损颗粒（TWP）在组成、添加剂和特性方面存在显著差异。在本研究中，对典型微塑料和轮胎磨损颗粒对有机污染物的吸附和解吸情况进行了比较。以轮胎磨损颗粒和聚氯乙烯（PVC）颗粒为吸附剂，土霉素（OTC）和磺胺甲恶唑（SMZ）为被吸附物，研究了老化前后轮胎磨损颗粒和PVC颗粒对有机污染物的吸附和解吸情况。正确理解微塑料在水生环境中的行为具有重要意义。结果表明，在紫外线老化过程中，轮胎磨损颗粒和PVC颗粒表面均出现裂纹、凹坑和凸起，比表面积增加，含氧官能团强度增加，亲水性增强。老化前后轮胎磨损颗粒和PVC颗粒的吸附模式分为两个阶段：表面吸附和液膜扩散。轮胎磨损颗粒更适合Freundlich模型，属于多层吸附，而PVC更适合Langmuir模型，属于单层吸附。轮胎磨损颗粒对抗生素的载体效应优于PVC，土霉素在原始轮胎磨损颗粒和PVC上的吸附量分别达到5.14 mg·g和1.38 mg·g。此外，土霉素在老化后的轮胎磨损颗粒和PVC上的吸附量分别达到5.82 mg·g和2.13 mg·g，优于原始样品。老化后的轮胎磨损颗粒和PVC对抗生素的解吸能力优于原始材料，而解吸率较低。在相同的解吸溶液中，老化前后轮胎磨损颗粒对抗生素的解吸效果优于PVC。在模拟肠液环境中，轮胎磨损颗粒和PVC对抗生素的解吸效果明显优于超纯水环境。
