Han Wenhui, Hou Yuanzhang, Yu Ying, Lu Zhibo, Qiu Yuping
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
J Hazard Mater. 2022 Jul 15;434:128912. doi: 10.1016/j.jhazmat.2022.128912. Epub 2022 Apr 14.
This study explored the influence of fibrous and filmy polyethylene terephthalate (PET) on the transportation of nanoplastics (NPs) in saturated porous media. With the strong electrostatic repulsion, the negatively charged PET fibers (-57.5 mV) improved the transport of NPs, and the mass percentage of NPs recovered from the effluent (M) increased from 69.3% to 86.7%. However, PET films (-49.7 mV) showed the opposite result, that is, M decreased from 69.3% to 57.0%. X-ray micro-computed tomography quantitatively revealed the change in effective porosity of porous media before and after adding various PET MPs. The addition of 10 mm fiber increased the porosity from 0.39 to 0.43, whereas the addition of 10 × 10 mm film reduced the porosity from 0.39 to 0.29. The fiber-facilitated transport of NPs is presumably due to the formation of new connected pores between fibers and sand grains, whereas the film-inhibited transport of NPs may be due to the partial truncation of transport path of NPs. Overall, the effect of coexisting MPs on the mobility of NPs strongly relies on the shape and size of MPs.
本研究探讨了纤维状和薄膜状聚对苯二甲酸乙二酯（PET）对纳米塑料（NPs）在饱和多孔介质中运移的影响。由于强烈的静电排斥作用，带负电荷的PET纤维（-57.5 mV）促进了NPs的运移，从流出物中回收的NPs质量百分比（M）从69.3%增加到了86.7%。然而，PET薄膜（-49.7 mV）却呈现出相反的结果，即M从69.3%降至57.0%。X射线显微计算机断层扫描定量揭示了添加各种PET微塑料前后多孔介质有效孔隙率的变化。添加10 mm的纤维使孔隙率从0.39增加到0.43，而添加10×10 mm的薄膜则使孔隙率从0.39降低到0.29。纤维促进NPs运移可能是由于在纤维和砂粒之间形成了新的连通孔隙，而薄膜抑制NPs运移可能是由于部分截断了NPs的运移路径。总体而言，共存微塑料对NPs迁移率的影响强烈依赖于微塑料的形状和尺寸。
