School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, Shaanxi 710119, PR China.
School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, Shaanxi 710119, PR China.
Mar Pollut Bull. 2024 Jul;204:116521. doi: 10.1016/j.marpolbul.2024.116521. Epub 2024 May 27.
The omnipresence of microplastics (MPs) around the world has attracted extensive attention in the past decade with more focuses on the interactions of standard MPs without additives in regular shapes and individual pollutant, whereas the actual MPs containing various additives in irregular shapes and complex pollutants are often co-occurrence in the environments. In this paper, the adsorption performance of disposable polypropylene (PP) cups-based MPs subjected to ultraviolet irradiation was investigated in unitary and binary water matrices. The surface characteristics were analyzed and the experimental data of adsorption were fitted by various kinetic and isotherm models, and the results indicated that more cracks and oxygen-containing functional groups with decreased hydrophobicity were produced with aging, and electrostatic attraction and hydrogen bonding dominated methylene blue (MB) and tetracycline (TC) capture in the individual system. Moreover, pseudo-second order kinetic model better described the adsorption processes. In the binary system, the co-existence of TC promoted MB uptake, while the presence of MB inhibited TC capture. In addition, TC adsorption was enhanced by Ca, maybe due to its complexation effect, while the presence of mono- and divalent inorganic salts inhibited MB capture. This research provides useful insights for the fate of PP-MPs and organic pollutants in the complex environments.
微塑料（MPs）在全球范围内的普遍存在在过去十年中引起了广泛关注，更多的关注点集中在标准 MPs 与常规形状和单一污染物的相互作用上，而实际的 MPs 则含有各种添加剂，形状不规则，污染物复杂，通常在环境中共同存在。本文研究了受紫外线照射的一次性聚丙烯（PP）杯状 MPs 在单一和二元水基质中的吸附性能。分析了表面特性，并通过各种动力学和等温线模型对吸附实验数据进行了拟合，结果表明，老化后会产生更多的裂缝和含氧官能团，疏水性降低，静电吸引和氢键在单一体系中主导着亚甲基蓝（MB）和四环素（TC）的捕获。此外，拟二级动力学模型更好地描述了吸附过程。在二元体系中，TC 的共存促进了 MB 的吸收，而 MB 的存在则抑制了 TC 的捕获。此外，TC 的吸附被 Ca 增强，可能是由于其络合作用，而一价和二价无机盐的存在则抑制了 MB 的捕获。本研究为 PP-MPs 和有机污染物在复杂环境中的归宿提供了有用的见解。
