Observation of the degradation of three types of plastic pellets exposed to UV irradiation in three different environments
Observation of the degradation of three types of plastic pellets exposed to UV irradiation in three different environments
复制标题
三种塑料颗粒在三种不同环境下暴露于紫外线照射下的降解观察
DOI：
10.1016/j.scitotenv.2018.02.079
复制
发表时间：
2018-07-01
影响因子：
9.8
通讯作者：
Tan, Xiangling
中科院分区：
文献类型：
--
作者：
Cai, Liqi;Wang, Jundong;Tan, Xiangling
塑料废弃物是海洋环境中最普遍和最持久的污染问题之一。特别是，主要从较大塑料碎片中降解的微塑料已成为一个日益严重的环境问题。然而，关于塑料在水生生物居住的水生环境中降解的研究有限，而关于塑料降解的几项研究是在室外或加速风化条件下进行的。因此，在三种不同的环境（即，模拟海水、超纯水和无水（空气）条件）。收集了有关物理和化学性质变化的数据。结果表明，在空气和超纯水环境条件下，3种风化塑料颗粒经3个月的紫外光照射后均产生了羟基和羰基，而在模拟海水环境中仅产生了羰基。相比之下，拉曼光谱显示，风化塑料颗粒没有显着的变化，但有不同强度的特征峰后，暴露于紫外线照射。此外，SEM图像显示，颗粒氧化，裂纹和剥落是常见的模式在降解过程中，和塑料颗粒在三个不同的环境经历了不同程度的化学风化。我们建议，需要进一步研究塑料碎片的降解过程，以预测塑料碎片在环境中的命运。(C)2018爱思唯尔B.V.保留所有权利。
Plastic debris represents one of the most prevalent and persistent pollution problems in the marine environment. In particular, microplastics that are mainly degraded from larger plastic debris have become a growing environmental concern. However, studies on the degradation of plastics in the aquatic environment that hydrobios reside in have been limited, while several studies regarding the degradation of plastics have been conducted under outdoor or accelerated weathering conditions. Thus, observation of the degradation of three types of virgin plastic pellets exposed to UV irradiation in three different environments (i.e., simulated seawater, ultrapure water, and a waterless (air) condition) was carried out. Data on the changes in physical and chemical properties were collected. The MR spectra showed that hydroxyl groups and carbonyl groups developed in three types of weathered plastic pellets under the air and ultrapure water environmental conditions after 3 months of UV irradiation, while only carbonyl groups were found in plastic pellets in the simulated seawater environment. In contrast, the Raman spectra showed no significant changes in the weathered plastic pellets, but there were different intensities of characteristic peaks after exposure to UV irradiation. In addition, SEM images illustrated that granular oxidation, cracks and flakes were common patterns during degradation, and the plastic pellets in the three different environments experienced different levels of chemical weathering. We suggest that further studies on the degradation processes of plastic debris are needed to predict the fate of plastic debris in the environment. (C) 2018 Elsevier B.V. All rights reserved.