Sajkowska Sylwia, Leśniewska Barbara
Doctoral School, University of Bialystok, Ciołkowskiego 1K, 15-245 Białystok, Poland.
Department of Analytical and Inorganic Chemistry, Faculty of Chemistry, University of Bialystok, Ciołkowskiego 1K, 15-245 Bialystok, Poland.
Molecules. 2024 Dec 19;29(24):5987. doi: 10.3390/molecules29245987.
In this work, for the first time, the sorption behaviour of platinum and palladium on polyethylene microplastics (PE-MP) was studied. To simulate natural conditions, part of PE-MP was subjected to the ageing process in lake water under the influence of solar radiation. The original and aged PE-MP was characterised using elemental analysis, FT-IR, SEM-EDX, and nitrogen porosimetry methods. The studies on Pt and Pd sorption on PE-MP were carried out in batch mode in natural lake water at pH 7.6. It was found that the ageing process led to the degradation of the surface of the PE-MP and the formation of a biofilm. The sorption process of Pt and Pd on PE-MP particles proceeds according to pseudo-second-order kinetics. A good fit of the experimental data to the Freundlich and Langmuir isotherm model indicates the mixed nature of Pt and Pd sorption on PE-MP. It was clearly indicated that Pt and Pd sorption from natural waters can occur on the surface of inert polyethylene particles, which can lead to the preconcentration of these elements, even from waters with a very low content, and transferring them over longer distances. This poses a threat to the health of living organisms and humans.
在这项工作中，首次研究了铂和钯在聚乙烯微塑料（PE-MP）上的吸附行为。为了模拟自然条件，部分PE-MP在太阳辐射影响下于湖水中进行老化处理。使用元素分析、傅里叶变换红外光谱（FT-IR）、扫描电子显微镜-能谱分析（SEM-EDX）和氮孔隙率测定法对原始和老化后的PE-MP进行了表征。在pH值为7.6的天然湖水中以批次模式进行了铂和钯在PE-MP上的吸附研究。发现老化过程导致PE-MP表面降解并形成生物膜。铂和钯在PE-MP颗粒上的吸附过程遵循准二级动力学。实验数据与弗伦德利希等温线模型和朗缪尔等温线模型的良好拟合表明铂和钯在PE-MP上的吸附具有混合性质。结果清楚表明，天然水中的铂和钯可以在惰性聚乙烯颗粒表面发生吸附，这可能导致这些元素的预富集，即使是在含量极低的水体中，并且将它们转移到更远的距离。这对生物体和人类的健康构成了威胁。
