College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi Province, People's Republic of China.
Department of Life Sciences, Changzhi University, Changzhi, 046011, People's Republic of China.
Environ Sci Pollut Res Int. 2023 Feb;30(7):18522-18534. doi: 10.1007/s11356-022-23482-y. Epub 2022 Oct 10.
Titanium dioxide (TiO) nanoparticles interact with organic-inorganic pollutants in the environment, and these interactions affect their environmental behavior. The mechanisms of the interaction between TiO and organic-inorganic pollutants on the surface of clay minerals are still unclear. In this work, isotherm adsorption was studied to explore the interactions between Cd/tetracycline (TC), TiO nanoparticles, and a zeolite (Zeo). SEM, FT-IR, and XPS were also used to reveal the interaction mechanism between organic-inorganic pollutants and TiO on their stability and mobility in the environment. Compared to the single systems, the adsorption of Cd and TiO in the Cd + TiO composite system decreased by 3.43% and 9.90%, respectively; the TC and TiO adsorption in the TC + TiO composite system decreased by 14.39% and 45.47%, respectively. The antagonism between Cd and TiO was due to Cd and TiO competing for the electrostatic attraction (-OH) and hydrogen bonding sites (Si-O), and TC and TiO competing for the hydrogen bonding sites (-OH and C = O) on Zeo. The presence of TiO will increase the mobility of Cd and TC on a clay surface, and this effect is more significant for organic pollutants TC. Compared with Cd, TC has a more significant boosting impact on the TiO mobility.
二氧化钛 (TiO) 纳米颗粒与环境中的有机-无机污染物相互作用，这些相互作用会影响它们的环境行为。TiO 与粘土矿物表面上的有机-无机污染物之间相互作用的机制尚不清楚。在这项工作中，通过等温吸附研究来探索 Cd/四环素 (TC)、TiO 纳米颗粒和沸石 (Zeo) 之间的相互作用。还使用 SEM、FT-IR 和 XPS 来揭示有机-无机污染物与 TiO 之间的相互作用机制及其在环境中的稳定性和迁移性。与单一体系相比，Cd 在 Cd+TiO 复合体系中的吸附减少了 3.43%，TiO 的吸附减少了 9.90%；TC 在 TC+TiO 复合体系中的吸附减少了 14.39%，TiO 的吸附减少了 45.47%。Cd 和 TiO 之间的拮抗作用是由于 Cd 和 TiO 竞争静电吸引 (-OH) 和氢键位点 (Si-O)，以及 TC 和 TiO 竞争 Zeo 上的氢键位点 (-OH 和 C=O)。TiO 的存在会增加 Cd 和 TC 在粘土表面上的迁移性，并且这种效应对于有机污染物 TC 更为显著。与 Cd 相比，TC 对 TiO 迁移性的促进作用更为显著。
