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The photodegradation processes and mechanisms of polyvinyl chloride and polyethylene terephthalate microplastic in aquatic environments: Important role of clay minerals

Water Research 2021 179 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 50 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Ling Ding, Ling Ding, Peng Liu, Peng Liu, Xiaoqin Yu, Xiaoqin Yu, Peng Liu, Xiaoqin Yu, Xiaoqin Yu, Peng Liu, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Peng Liu, Xiaoqin Yu, Xiaoqin Yu, Xiaoqin Yu, Xuetao Guo Xuetao Guo Xuetao Guo Ling Ding, Xiaoqin Yu, Ling Ding, Ling Ding, Xiaoqin Yu, Peng Liu, Peng Liu, Peng Liu, Peng Liu, Xiaoqin Yu, Xuetao Guo Peng Liu, Tiecheng Wang, Hanzhong Jia, Chi Zhang, Xuetao Guo Zhuozhi Ouyang, Zhuozhi Ouyang, Hanzhong Jia, Hanzhong Jia, Xuetao Guo Hanzhong Jia, Hanzhong Jia, Xuetao Guo Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Xiaoqin Yu, Xiaoqin Yu, Peng Liu, Xuetao Guo Peng Liu, Zhuozhi Ouyang, Xuetao Guo Xiaoqin Yu, Peng Liu, Xuetao Guo Xiaoqin Yu, Xuetao Guo Zhuozhi Ouyang, Chi Zhang, Xuetao Guo Zhuozhi Ouyang, Xuetao Guo Xuetao Guo Xiaoqin Yu, Peng Liu, Xuetao Guo Zhuozhi Ouyang, Xuetao Guo Xiaoqin Yu, Xiaoqin Yu, Xuetao Guo Chi Zhang, Xuetao Guo Xiaoqin Yu, Peng Liu, Zhuozhi Ouyang, Peng Liu, Zhuozhi Ouyang, Zhuozhi Ouyang, Xiaoqin Yu, Zhuozhi Ouyang, Xiaoqin Yu, Xiaoqin Yu, Chi Zhang, Zhuozhi Ouyang, Xiaoqin Yu, Zhuozhi Ouyang, Chi Zhang, Zhuozhi Ouyang, Tiecheng Wang, Chi Zhang, Hanzhong Jia, Hanzhong Jia, Xuetao Guo Zhuozhi Ouyang, Hanzhong Jia, Hanzhong Jia, Xuetao Guo Zhuozhi Ouyang, Peng Liu, Xuetao Guo Xuetao Guo Zhuozhi Ouyang, Xuetao Guo Xuetao Guo Yaping Zhang, Xuetao Guo Zhuozhi Ouyang, Zhuozhi Ouyang, Hanzhong Jia, Hanzhong Jia, Xuetao Guo Zhuozhi Ouyang, Xuetao Guo Xuetao Guo Xuetao Guo Zhuozhi Ouyang, Peng Liu, Peng Liu, Tiecheng Wang, Tiecheng Wang, Peng Liu, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Zhuozhi Ouyang, Xuetao Guo Lingyan Zhu, Zhuozhi Ouyang, Lingyan Zhu, Ling Ding, Yaping Zhang, Xuetao Guo Chi Zhang, Zhuozhi Ouyang, Hanzhong Jia, Zhuozhi Ouyang, Hanzhong Jia, Hanzhong Jia, Lingyan Zhu, Tiecheng Wang, Lingyan Zhu, Hanzhong Jia, Xuetao Guo Lingyan Zhu, Lingyan Zhu, Hanzhong Jia, Xuetao Guo Hanzhong Jia, Xuetao Guo Xuetao Guo Tiecheng Wang, Peng Liu, Xuetao Guo Hanzhong Jia, Zhuozhi Ouyang, Hanzhong Jia, Zhuozhi Ouyang, Xuetao Guo Lingyan Zhu, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Xuetao Guo Hanzhong Jia, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Tiecheng Wang, Tiecheng Wang, Tiecheng Wang, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Peng Liu, Peng Liu, Peng Liu, Peng Liu, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Peng Liu, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Tiecheng Wang, Xuetao Guo Xuetao Guo Hanzhong Jia, Xuetao Guo Hanzhong Jia, Xuetao Guo Hanzhong Jia, Hanzhong Jia, Xuetao Guo Zhuozhi Ouyang, Tiecheng Wang, Tiecheng Wang, Tiecheng Wang, Tiecheng Wang, Xuetao Guo Lingyan Zhu, Xuetao Guo Lingyan Zhu, Chi Zhang, Xuetao Guo Xuetao Guo Lingyan Zhu, Lingyan Zhu, Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Hanzhong Jia, Xuetao Guo Lingyan Zhu, Xuetao Guo Xuetao Guo Xuetao Guo Peng Liu, Hanzhong Jia, Hanzhong Jia, Xuetao Guo Hanzhong Jia, Xuetao Guo Hanzhong Jia, Lingyan Zhu, Tiecheng Wang, Tiecheng Wang, Xuetao Guo Peng Liu, Xuetao Guo Xuetao Guo Peng Liu, Peng Liu, Zhuozhi Ouyang, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Xuetao Guo Xuetao Guo Lingyan Zhu, Tiecheng Wang, Tiecheng Wang, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Tiecheng Wang, Tiecheng Wang, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Xuetao Guo Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Lingyan Zhu, Xuetao Guo Hanzhong Jia, Xuetao Guo Hanzhong Jia, Xuetao Guo Hanzhong Jia, Hanzhong Jia, Xuetao Guo Lingyan Zhu, Xuetao Guo Hanzhong Jia, Tiecheng Wang, Lingyan Zhu, Xuetao Guo

Summary

Researchers found that clay minerals like kaolinite and montmorillonite play an important role in the photodegradation of PVC and PET microplastics in aquatic environments, either accelerating or modifying UV-driven weathering processes.

Polymers

PE PET PVC

It is well known that microplastics (MPs) may experience weathering and aging under ultraviolet light (UV) irradiation, but it remains unclear if these processes are impacted by natural components, such as clay minerals. In this study, we systematically investigated the photodegradation behaviors of polyvinyl chloride (PVC) and poly (ethylene terephthalate) (PET), two utmost used plastics, in the presence of clay minerals (kaolinite and montmorillonite). The results demonstrated that the clay minerals, particularly kaolinite, significantly promoted the MPs photodegradation, and the aging of PET was more prominent. The photodegradation was the most distinct at pH 7.0, regardless of the presence or absence of the clay minerals. The results of electron paramagnetic resonance and inhibition experiments of reactive oxygen species indicated that the minerals, particularly kaolinite, remarkably facilitated production of •OH, which was the key species contributing to the photodegradation of MPs. Specifically, UV irradiation facilitated the photo-ionization of MPs, producing hydrated electrons and MP radical cations (MP). The Lewis base sites prevalent on the clay siloxane surfaces could stabilize the MP radical cations and prevent their recombination with hydrated electrons, which promoted the generation of •OH under aerobic conditions, and facilitated the degradation of MP. Two-dimensional (2D) Fourier transformation infrared (FTIR) correlation spectroscopy (COS) analysis and ultra-high-performance liquid chromatography coupled to a Q Exactive Orbitrap HF mass spectrometer were used to identify the sequential changes of functional groups, and the degradation products of the MPs. This study improves our understanding on the aging of MPs in the complex natural environment.

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