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Inorganic anions influenced the photoaging kinetics and mechanism of polystyrene microplastic under the simulated sunlight: Role of reactive radical species

Water Research 2022 113 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.

Xuetao Guo, Xuetao Guo, Kecheng Zhu, Ze Liu, Ze Liu, Ze Liu, Kecheng Zhu, Kecheng Zhu, Wenjun Jiang, Wenjun Jiang, Kecheng Zhu, Xuetao Guo, Kecheng Zhu, Hanzhong Jia, Yajiao Sun, Yajiao Sun, Kecheng Zhu, Hanzhong Jia, Xuetao Guo, Tiecheng Wang, Kecheng Zhu, Kecheng Zhu, Yajiao Sun, Yajiao Sun, Xuetao Guo, Kecheng Zhu, Xuetao Guo, Xuetao Guo, Chi Zhang, Xuetao Guo, Kecheng Zhu, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Yajiao Sun, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Yajiao Sun, Yajiao Sun, Yajiao Sun, Yunchao Dai, Yajiao Sun, Yajiao Sun, Chi Zhang, Chi Zhang, Chi Zhang, Chi Zhang, Yunchao Dai Wenjun Jiang, Wenjun Jiang, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Yunchao Dai, Yunchao Dai, Yajiao Sun, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Tiecheng Wang, Tiecheng Wang, Hanzhong Jia, Xuetao Guo, Tiecheng Wang, Xuetao Guo, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Yunchao Dai Yunchao Dai Ze Liu, Kecheng Zhu, Kecheng Zhu, Chi Zhang, Yajiao Sun, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, 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, Tiecheng Wang, Tiecheng Wang, Wenjun Jiang, Wenjun Jiang, Kecheng Zhu, Yunchao Dai Ze Liu, Chi Zhang, Yunchao Dai, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Ze Liu, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Yunchao Dai, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Yunchao Dai Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Yajiao Sun, Xuetao Guo, Hanzhong Jia, Xuetao Guo, Hanzhong Jia, Tiecheng Wang, Tiecheng Wang, Xuetao Guo, Tiecheng Wang, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Yajiao Sun, Xuetao Guo, Xuetao Guo, Ze Liu, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Kecheng Zhu, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Tiecheng Wang, Tiecheng Wang, Tiecheng Wang, Hanzhong Jia, Chi Zhang, Xuetao Guo, Tiecheng Wang, Hanzhong Jia, Tiecheng Wang, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Tiecheng Wang, Tiecheng Wang, Kecheng Zhu, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Ze Liu, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Tiecheng Wang, Xuetao Guo, Tiecheng Wang, Tiecheng Wang, Tiecheng Wang, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Xuetao Guo, Hanzhong Jia, Tiecheng Wang, Xuetao Guo, Yunchao Dai, Yunchao Dai

Summary

Researchers found that common inorganic anions in natural water significantly influence the photoaging of polystyrene microplastics under sunlight, with nitrate and bicarbonate accelerating degradation while chloride and bromide had varying effects on aging mechanisms.

Polymers

The photo-transformation of microplastic (MP) in natural water may involve interactions with various ingredients, but the photoaging kinetics and underlying mechanism are not well understood. This work systematically explored the photoaging process of polystyrene microplastic (PS-MP) in the presence of commonly-found inorganic anions, including NO, HCO, Br and Cl. The addition of these ions led to more obvious changes in the morphology, functional groups and molecular weight of photoaging PS-MP. The evolution of carbonyl index value for the photoaged samples conformed to pseudo-first-order kinetic model, and the photoaging rate constant (k) in the presence of inorganic anions at their environmentally relevant concentrations of 0.6 mM, 1.2 mM, 0.1 M and 0.1 mM was calculated to be k = 0.0074 d, k = 0.01001 d, k = 0.00783 d, and k = 0.00888 d, which was higher than that in ultrapure water (k=0.00705 d). Electron paramagnetic resonance technique and quenching experiments demonstrated that photo-transformation of PS-MP was mainly mediated by indirect photolysis, i.e., the formation of reactive radical species. The photosensitivity of NO promoted more •OH production, thereby accelerated the indirect photoaging of PS-MP. Meanwhile, the presence of halide ions promoted the generation of reactive halogen species, which were also involved in the indirect photoaging of PS-MP. Interestingly, as •OH scavenger, HCO had no inhibitory effect on PS-MP photoaging, attributing to the oxidation of CO. This study provides valuable insights into the understanding of photo-transformation of MPs in natural aquatic environments.

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