纳米塑料风化与多环芳烃动员,ACS Nano

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纳米塑料风化与多环芳烃动员
ACS Nano ( IF 15.8 ) Pub Date : 2023-03-07 , DOI: 10.1021/acsnano.2c12224
Erik B. Schiferle , Wenxu Ge , Björn M. Reinhard

尽管回收塑料材料的努力越来越多，但大量塑料垃圾仍在海洋中堆积。海洋中塑料的持续机械和光化学降解会产生微米级和纳米级塑料颗粒，它们代表了在水环境中移动疏水性致癌物的潜在载体。然而，与塑料相关的命运和潜在威胁在很大程度上仍未得到探索。在此，我们将加速风化协议应用于消费塑料，以表征光化学风化在规定条件下对纳米塑料的尺寸、形态和化学成分的影响，并验证光化学降解与从太平洋收获的塑料一致。使用加速风化数据训练的机器学习算法成功地将风化塑料从自然界中分类出来。我们证明，含聚（对苯二甲酸乙二醇酯）(PET) 的塑料的光降解会产生足够的 CO_{2诱导矿化过程，导致 CaCO}₃沉积在纳米塑料上。最后，我们确定，尽管紫外线辐射会引起光化学降解和矿物沉积，但纳米塑料仍然能够在水中和模拟生理胃肠道条件下吸附、调动和增加多环芳烃 (PAH) 的生物可及性。

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Nanoplastics Weathering and Polycyclic Aromatic Hydrocarbon Mobilization

Despite increasing efforts to recycle plastic materials, large quantities of plastics waste continue to accumulate in the oceans. Persistent mechanical and photochemical degradation of plastics in the oceans yields micro- and nanoscale plastic particles, which represent potential vectors for mobilizing hydrophobic carcinogens in an aqueous milieu. Yet, the fate and potential threats associated with plastics remain largely unexplored. Herein, we apply an accelerated weathering protocol to consumer plastics to characterize the effect of photochemical weathering on the size, morphology, and chemical composition of nanoplastics under defined conditions and validate that the photochemical degradation is consistent with plastics harvested from the Pacific Ocean. Machine learning algorithms trained with accelerated weathering data successfully classify weathered plastics from nature. We demonstrate that photodegradation of poly(ethylene terephthalate) (PET)-containing plastics produces enough CO₂ to induce a mineralization process that results in the deposition of CaCO₃ on nanoplastics. Finally, we determine that despite UV-radiation induced photochemical degradation and mineral deposition, nanoplastics retain their ability to sorb, mobilize, and increase bioaccessibility of polycyclic aromatic hydrocarbons (PAHs) in water and under simulated physiological gastric and intestinal conditions.

更新日期：2023-03-07

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