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The First Observation of the Formation of Persistent Aminoxyl Radicals and Reactive Nitrogen Species on Photoirradiated Nitrogen-Containing Microplastics

Environmental Science & Technology 2021 74 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 55 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.
Wenjun Jiang, Wenjun Jiang, Kecheng Zhu, Kecheng Zhu, Xuetao Guo, Xuetao Guo, Kecheng Zhu, Kecheng Zhu, Xuetao Guo, Ze Liu, Ze Liu, Ze Liu, Kecheng Zhu, Kecheng Zhu, Xuetao Guo, Xuetao Guo, Kecheng Zhu, Hanzhong Jia, Hanzhong Jia, Kecheng Zhu, Kecheng Zhu, Tiecheng Wang Xuetao Guo, Yajiao Sun, Yajiao Sun, Yajiao Sun, Yajiao Sun, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Kecheng Zhu, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Wenjun Jiang, Xuetao Guo, Yajiao Sun, Yajiao Sun, Wenjun Jiang, Yajiao Sun, Yajiao Sun, Yajiao Sun, Yajiao Sun, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Tiecheng Wang Kecheng Zhu, Yajiao Sun, Tiecheng Wang Ze Liu, Xuetao Guo, Tiecheng Wang Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Kecheng Zhu, Xuetao Guo, Yajiao Sun, Xuetao Guo, Xuetao Guo, Lingyan Zhu, Lingyan Zhu, Xuetao Guo, Xuetao Guo, Xuetao Guo, Tiecheng Wang Tiecheng Wang Hanzhong Jia, Chi Zhang, Ze Liu, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Kecheng Zhu, Xuetao Guo, Wenjun Jiang, Hanzhong Jia, Wenjun Jiang, Lingyan Zhu, Lingyan Zhu, Xuetao Guo, Xuetao Guo, Xuetao Guo, Lingyan Zhu, Xuetao Guo, Lingyan Zhu, Xuetao Guo, Xuetao Guo, Ze Liu, Xuetao Guo, Ze Liu, Yajiao Sun, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Yajiao Sun, Xuetao Guo, Tiecheng Wang Xuetao Guo, Lingyan Zhu, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Tiecheng Wang Xuetao Guo, Xuetao Guo, Hanzhong Jia, Tiecheng Wang Lingyan Zhu, Lingyan Zhu, Xuetao Guo, Hanzhong Jia, Lingyan Zhu, Hanzhong Jia, Lingyan Zhu, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Lingyan Zhu, 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, Hanzhong Jia, Lingyan Zhu, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, 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, Xuetao Guo, Xuetao Guo, Xuetao Guo, Tiecheng Wang Tiecheng Wang Tiecheng Wang Tiecheng Wang Tiecheng Wang Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Kecheng Zhu, Xuetao Guo, Xuetao Guo, Xuetao Guo, Ze Liu, Xuetao Guo, Tiecheng Wang Hanzhong Jia, Xuetao Guo, Xuetao Guo, Kecheng Zhu, Xuetao Guo, Lingyan Zhu, Hanzhong Jia, Lingyan Zhu, Xuetao Guo, Tiecheng Wang Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Xuetao Guo, Hanzhong Jia, Tiecheng Wang Lingyan Zhu, Xuetao Guo, Xuetao Guo, Xuetao Guo, Lingyan Zhu, Xuetao Guo, Xuetao Guo, Xuetao Guo, 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, Tiecheng Wang Tiecheng Wang Tiecheng Wang Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Lingyan Zhu, Xuetao Guo, Hanzhong Jia, Hanzhong Jia, Xuetao Guo, Xuetao Guo, Lingyan Zhu, Xuetao Guo, Hanzhong Jia, Tiecheng Wang

Summary

Researchers made the first observation of persistent aminoxyl radicals and reactive nitrogen species forming on nitrogen-containing microplastics under light irradiation. The study found that photoaged polyamide generated these reactive species, which exhibited significantly higher oxidative and reductive potential, providing important information about the potential health risks of airborne nitrogen-containing microplastics.

Polymers
PA

Nitrogen-containing microplastics (N-MPs) are widely present in the atmosphere, but their potential health risks have been overlooked. In this study, the formation of persistent aminoxyl radicals (PAORs) and reactive nitrogen species (RNSs) on the N-MPs under light irradiation was investigated. After photoaging, an anisotropic triplet with the g-factor of ∼2.0044, corresponding to PAORs, was detected on the nonaromatic polyamide (PA) rather than amino resin (AmR) by electron paramagnetic resonance and confirmed by density functional theory calculations. The generated amine oxide portions on the photoaged PA were identified using X-ray photoelectron spectroscopy and Raman spectroscopy, which were considered to be the main structural basis/precursors of a PAOR. Surprisingly, RNSs were also observed on the irradiated PA. The generated ·NO due to the aphotolysis of nitrone groups simultaneously reacted with peroxide radicals and O<sub>2</sub>·<sup>-</sup> to yield ·NO<sub>2</sub> and peroxynitrite, respectively, which were responsible for peroxyacyl nitrates (PAN) and CO<sub>3</sub>·<sup>-</sup> formation. Besides, a significantly higher oxidative potential and reductive potential were observed for the aged PA than AmR, which is assigned to the abundant RNSs, organic hydroperoxides and PANs, and a strong ability to transfer electrons from PAOR, respectively. This work provides important information for the potential risks of airborne N-MPs and may serve as a guide for future toxicological assessments.

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