School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, PR China; School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, Heilongjiang 150090, PR China.
School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, Shandong 264209, PR China.
Sci Total Environ. 2022 Oct 10;842:156832. doi: 10.1016/j.scitotenv.2022.156832. Epub 2022 Jun 26.
Microplastics (MPs) pollution has been becoming serious and widespread in the global environment. Although MPs have been identified as vectors for contaminants, adsorption and desorption behaviors of chemicals with non-biodegradable and biodegradable MPs during the aging process is limited. In this work, the adsorption behaviors of triclosan (TCS) by non-biodegradable polyethylene (PE) and polypropylene (PP), and biodegradable polylactic acid (PLA) were investigated. The differences in morphology, chemical structures, crystallization, and hydrophilicity were investigated after the ultraviolet aging process and compared with the virgin MPs. The results show that the water contact angles of the aged MPs were slightly reduced compared with the virgin MPs. The aged MPs exhibited a stronger adsorption capacity for TCS because of the physical and chemical changes in MPs. The virgin biodegradable PLA had a larger adsorption capacity than the non-biodegradable PE and PP. The adsorption capacity presented the opposite trend after aging. The main adsorption mechanism of MPs relied on hydrophobicity interaction, hydrogen bonding, and electrostatic interaction. The work provides new insights into TCS as hazardous environmental contaminants, which will enhance the vector potential of non-biodegradable and biodegradable MPs.
微塑料（MPs）污染在全球环境中变得越来越严重和广泛。尽管 MPs 已被确定为污染物的载体，但在老化过程中非生物降解和可生物降解 MPs 对化学物质的吸附和解吸行为是有限的。在这项工作中，研究了非生物降解的聚乙烯（PE）和聚丙烯（PP）以及可生物降解的聚乳酸（PLA）对三氯生（TCS）的吸附行为。在紫外线老化过程后，研究了形态、化学结构、结晶度和亲水性的差异，并与原始 MPs 进行了比较。结果表明，与原始 MPs 相比，老化 MPs 的水接触角略有降低。由于 MPs 的物理和化学变化，老化 MPs 对 TCS 表现出更强的吸附能力。原始可生物降解的 PLA 的吸附能力大于非生物降解的 PE 和 PP。老化后，吸附能力呈现相反的趋势。 MPs 的主要吸附机制依赖于疏水性相互作用、氢键和静电相互作用。这项工作为 TCS 作为危险环境污染物提供了新的见解，这将增强非生物降解和可生物降解 MPs 的载体潜力。
