| 康雁茹, 朱丽丽, 文少白.紫外老化显著增强聚乳酸微塑料对Cd(Ⅱ)和Pb(Ⅱ)的吸附能力[J].海南师范大学学报自科版,2026,(2):236-242 |
| 紫外老化显著增强聚乳酸微塑料对Cd(Ⅱ)和Pb(Ⅱ)的吸附能力 |
| Significant Enhancement of the Adsorption Capacity of Polylactic Acid Microplastics on Cd(Ⅱ) and Pb(Ⅱ) by UV Aging |
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| DOI：10.12051/j.issn.1674-4942.2024.04.014 |
| 中文关键词: 聚乳酸 紫外老化 重金属离子 吸附效应 |
| 英文关键词: polylactic acid UV aging heavy metal ions adsorption effect |
| 基金项目:海南省重点研发资助项目 （ZDYF2022SHFZ096） |
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| 中文摘要: |
微塑料作为重金属的“载体”对水环境中重金属的迁移转化具有重要影响。目前的研究主要集中于石油类微塑料，关于可降解微塑料对重金属的载体效应研究相对匮乏。本研究旨在探讨可降解微塑料聚乳酸 （PLA）在模拟自然老化的紫外光老化后对镉离子［Cd（Ⅱ）］和铅离子［Pb（Ⅱ）］吸附性能的变化。结果表明，紫外老化显著改变了PLA的理化性质，颜色变为淡黄色，表面出现皱褶和裂纹，含氧官能团（—OH和C̿ ![]() ![]() O）丰度显著增加。尽管老化过程未改变PLA对重金属离子的吸附机制，但理化性质的变化显著增强了PLA对Cd（Ⅱ）和Pb（Ⅱ）的吸附能力。紫外老化40 d后，PLA对Cd（Ⅱ）和Pb（Ⅱ）的最大吸附量分别增加了4.33倍和3.14倍。研究结果揭示了紫外老化对PLA重金属载体效应的影响，为未来评估PLA与重金属联合污染的生态毒性效应提供了重要支持。 |
| 英文摘要: |
Microplastics serve as "carriers" for heavy metals, significantly influencing the migration and transformation of heavy metals in aquatic environments. Current research primarily focuses on petroleum-based microplastics, while studies on the carrier effects of biodegradable microplastics remain relatively scarce. This study aims to investigate the changes in the adsorption performance of cadmium ions [Cd(Ⅱ)] and lead ions [Pb(Ⅱ)] by degradable poly(lactic acid) (PLA) microplastics after simulated natural aging via ultraviolet (UV) light aging. The results demonstrated that UV aging significantly altered the physicochemical properties of PLA, resulting in a pale yellow coloration, surface wrinkling and cracking, and a marked increase in the abundance of oxygen-containing functional groups (—OH and C̿ ![]() ![]() O). Although the aging process did not modify the adsorption mechanism of PLA for heavy metal ions, the changes in physicochemical properties significantly enhanced the adsorption capacity of PLA for Cd(Ⅱ) and Pb(Ⅱ). After 40 days of UV aging, the maximum adsorption capacities of PLA for Cd(Ⅱ) and Pb(Ⅱ) increased by 4.33 fold and 3.14 fold, respectively. These findings elucidate the impact of UV aging on the heavy metal carrier effect of PLA, providing crucial support for future assessments of the ecotoxicological effects of PLA in co-contaminated heavy metal systems. |
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