Insights into the mechanism of plastics’ fragmentation under abrasive mechanical forces: An implication for agricultural soil health
Insights into the mechanism of plastics’ fragmentation under abrasive mechanical forces: An implication for agricultural soil health
复制标题
深入了解机械磨损力下塑料破碎的机制：对农业土壤健康的影响
DOI：
10.1002/clen.202200395
复制
发表时间：
2023
期刊：
影响因子：
3.4
通讯作者：
Salehi, Maryam
中科院分区：
文献类型：
--
作者：
Bhattacharjee, Linkon;Jazaei, Farhad;Salehi, Maryam
农用塑料产品，如地膜、温室覆盖物和青贮膜的应用正在增加，因为它们在提供早期和更好质量的收获方面具有经济效益。然而，土壤颗粒对这些塑料材料的机械磨损可能导致产生微塑料（MP）污染物，这些污染物可能会伤害土壤生物并影响食品安全。本研究旨在更好地了解导致低密度聚乙烯（LDPE）断裂的物理化学机制。在这里，我们使用颗粒和薄膜，研究磨料磨损力对其表面形貌变化和破碎行为的影响。开发了一种创新的实验室方法，以在受控的正常载荷和磨损持续时间下磨损塑料表面。由于磨损过程的塑料的表面形态变化的调查显示，在低法向力（4 N）的微切削作为主导过程。然而，通过将法向力增加到8 N，对于新的LDPE膜发生微犁削和微切割的组合。尽管由于磨损过程，新LDPE膜的表面形态发生了显著变化;但水接触角没有改变。此外，光降解的LDPE粒料和薄膜的破碎行为进行了比较，以新的塑料。使用荧光显微镜成像研究了由于碎片化而产生的MP（3 µm <dp< 162 µm）的程度。塑料与砂粒接触处的局部应力和应变导致了塑料表面的磨损。结果表明，法向载荷和磨损持续时间对塑料的破碎程度起着重要作用。将磨损过程中施加的法向载荷从2 N增加到8 N，使颗粒产生的塑料碎片数量线性增加了5倍以上，使薄膜产生的塑料碎片数量线性增加了3倍以上。光降解显着增强的程度MP的碎片化。此外，本研究的局限性和农业土壤健康的影响进行了讨论。
The application of agricultural plastic products such as mulch, greenhouse covers, and silage films is increasing due to their economic benefits in providing an early and better‐quality harvest. However, mechanical abrasion of these plastic materials by soil particles could result in generation of microplastic (MP) pollutants that could harm soil organisms and impact food safety. This study aims to better understand the physicochemical mechanisms resulting in the fragmentation of low‐density polyethylene (LDPE). Herein, we used pellets and films to study the impacts of abrasive wear forces on their surface morphology variations and fragmentation behavior. An innovative laboratory approach was developed to abrade the plastic surface under controlled normal loadings and abrasion durations. The investigation of the plastics’ surface morphology variations due to the abrasion process revealed microcutting as the dominant process at low normal force (4 N). However, a combination of microploughing and microcutting occurred for new LDPE films by increasing the normal force to 8 N. Despite the significant surface morphology variations of the new LDPE film due to the abrasion process; the water contact angle did not alter. Furthermore, the fragmentation behavior of photodegraded LDPE pellets and films was compared to the new plastics. The extent of MPs (3 µm <dp< 162 µm) generation due to fragmentation was studied using fluorescence microscopy imaging. The localized stress and strains at the contact sites of plastic and sand particles resulted in abrasion of the plastic surface. According to the results, the normal loadings and duration of abrasion played a significant role in the degree of fragmentation of plastics. Increasing the normal loading applied during the abrasion process from 2 to 8 N linearly increased the number of generated plastic fragments by more than five times for pellets and more than three times for film. Photodegradation significantly enhanced the extent of MPs fragmentation. Moreover, the limitations of this study and the implications for agricultural soil health were discussed.
DOI：
10.1007/978-3-642-80090-0
发表时间：
1996
期刊：
--
影响因子：
--
作者：
J. Rabek
通讯作者：
J. Rabek
使用钢轮磨损试验对磨损和磨料破碎进行联合研究
影响因子：
5
作者：
Poorya Hosseini;P. Radziszewski
通讯作者：
P. Radziszewski