PDF(Pubmed)
Abstract：
Plastic pollution, particularly microplastic (MP) and nanoplastic (NP) pollution, has become a significant concern. This study explores the use of porous wood for filtration to remove MPs and NPs and investigates their removal mechanisms. Undecorated fir wood with a thickness of 4 mm achieves a 91% removal rate for model polystyrene (PS) MPs (2.6 μm) at a water flux of 198 L/m2h. However, its separation performance for NPs (255.8 and 50.9 nm) is poor. It also shows that fir wood (coniferous wood) has a higher PS removal rate than poplar wood (hard wood). With poly dimethyl diallyl ammonium chloride (PDDA) modification, both MPs and NPs are effectively removed, with NPs\' removal rate increasing from <10% to 90% for PDDA/wood. Characterization results reveal that size-exclusive interception dominates for micron-sized particles, and electrostatic interaction is crucial for nanosized particles. Additionally, intercepted NPs have been used as a strong binder for hot-pressed wood to remarkably enhance the mechanical properties of wood, suggesting a novel recycle utilization of discarded wood filters. Overall, this renewable wood material offers a simple solution for tackling MP/NP pollution.
摘要：
塑料污染,特别是微塑料(MP)和纳米塑料(NP)污染，已经成为一个重要的问题。本研究探讨了使用多孔木材进行过滤以去除MPs和NPs，并研究了其去除机理。厚度为4mm的未装饰杉木，在198L/m2h的水通量下，模型聚苯乙烯（PS）MPs（2.6μm）的去除率为91％。然而,其对NPs(255.8和50.9nm)的分离性能较差。它还表明，杉木（针叶木）比杨木（硬木）具有更高的PS去除率。用聚二甲基二烯丙基氯化铵(PDDA)改性,议员和NP都被有效地移除，PDDA/木材的NPs去除率从<10%提高到90%。表征结果表明，微米级颗粒的尺寸排他性拦截占主导地位，静电相互作用对纳米颗粒至关重要。此外,截获的NPs已被用作热压木材的强力粘合剂，以显着增强木材的机械性能，建议一种新的废弃木材过滤器的回收利用。总的来说,这种可再生木材材料为解决MP/NP污染提供了一个简单的解决方案。
