20.500.12556/RUL-146387 A study of the adsorption of titanium dioxide and zinc oxide nanoparticles on polyethylene microplastics and their desorption in aquatic media In this study, we investigated the interactions between titanium dioxide (nTiO$_2$) and zinc oxide (nZnO) nanoparticles and polyethylene microplastics (MPs) with respect to their adsorption and subsequent desorption in aquatic media. Adsorption kinetic models revealed rapid adsorption of nZnO compared to nTiO$_2$, while nTiO$_2$ was adsorbed to a greater extent – four times more nTiO$_2$ (67%) was adsorbed on MPs than nZnO (16%). The low adsorption of nZnO can be explained by the partial dissolution of zinc from nZnO in the form of Zn(II) and/or Zn(II) aqua-hydroxo complexes (e.g. [Zn(OH)]$^+$, [Zn(OH)$_3$]$^−$, [Zn(OH)$_4$]$^{2−}$), which were not adsorbed on MPs. Adsorption isotherm models indicated that the adsorption process is controlled by physisorption for both nTiO$_2$ and nZnO. The desorption of nTiO$_2$ was low (up to 27%) and not pH dependent, and only nanoparticles were desorbed from the MPs surface. On the other hand, the desorption of nZnO was pH dependent; at a slightly acidic pH (pH = 6), 89% of the adsorbed zinc was desorbed from the MPs surface and the majority were in the form of nanoparticles; at a slightly alkaline pH (pH = 8.3), 72% of the zinc was desorbed, but the majority were in the soluble form of Zn(II) and/or Zn(II) aqua-hydroxo complexes. These results demonstrated the complexity and variability of interactions between MPs and metal engineered nanoparticles and contribute to a better understanding of their fate in the aquatic environment. microplastics nanoparticles metal nanoparticles adsorption desorption isotherms kinetics freshwaters nanomaterials mikroplastika nanodelci kovinski nanodelci adsorpcija desorpcija površinske vode true false true Angleški jezik Slovenski jezik Članek v reviji 2023-05-26 12:01:59 2023-05-26 12:02:01 2024-02-06 13:28:20 0000-00-00 00:00:00 2023 0 0 10 str. Vol. 888, art. 164163 Aug. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66:504.4:628.1 1879-1026 10.1016/j.scitotenv.2023.164163 153539331 1-s2.0-S0048969723027845-main.pdf 1-s2.0-S0048969723027845-main.pdf 1 292A3E2242A268730194A2D7F986A164 87bcab24f2a72189904ce66d4b8afdea83e96cfc4681e9409537867b03b29ba0 a94d18b4-fbae-11ed-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=169568 https://www.sciencedirect.com/science/article/pii/S0048969723027845 1 126c4699-fbac-11ed-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=169566 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0