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Article ? AI-assigned paper type based on the abstract. Classification may not be perfect — flag errors using the feedback button. Tier 2 ? Original research — experimental, observational, or case-control study. Direct primary evidence. Environmental Sources Nanoplastics Sign in to save

Dissolved Organic Matter Enhanced the Aggregation and Oxidation of Nanoplastics under Simulated Sunlight Irradiation in Water

Environmental Science & Technology 2022 79 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 45 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.
Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Fangyuan Cheng, Chao Li, Yanan Zhang, Tingting Zhang, Willie J.G.M. Peijnenburg Jingwen Chen, Jingwen Chen, Willie J.G.M. Peijnenburg Fangyuan Cheng, Willie J.G.M. Peijnenburg Tingting Zhang, Tingting Zhang, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Tingting Zhang, Tingting Zhang, Jingwen Chen, Tingting Zhang, Tingting Zhang, Tingting Zhang, Tingting Zhang, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Chao Li, Chao Li, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Yanan Zhang, Jingwen Chen, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Jiao Qu, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Jiao Qu, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Tingting Zhang, Tingting Zhang, Tingting Zhang, Tingting Zhang, Jiao Qu, Jiao Qu, Willie J.G.M. Peijnenburg Jiao Qu, Jiao Qu, Jingwen Chen, Jingwen Chen, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Yanan Zhang, Willie J.G.M. Peijnenburg Tingting Zhang, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Jiao Qu, Willie J.G.M. Peijnenburg Jiao Qu, Willie J.G.M. Peijnenburg Jiao Qu, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Yanan Zhang, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Tingting Zhang, Tingting Zhang, Chao Li, Yanan Zhang, Jiao Qu, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Jiao Qu, Tingting Zhang, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Jingwen Chen, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Tingting Zhang, Tingting Zhang, Jingwen Chen, Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg Willie J.G.M. Peijnenburg

Summary

Dissolved organic matter was found to enhance both the aggregation and photooxidation of nanoplastics under simulated sunlight in water, with humic substances promoting particle clustering and accelerating surface oxidation. The results indicate that organic matter content in natural waters strongly influences nanoplastic fate and transformation.

Polymers
PS
Study Type Environmental

Nanoplastics (NPs) have become a new type of pollutant of high concern that is ubiquitous in aqueous environments. However, the transport and transformation of NPs in natural waters are not yet fully understood. In this study, the aggregation and photooxidation of NPs were assessed with nanosized polystyrene (PS) as an example, and the effects of dissolved organic matter (DOM) were investigated with Suwannee River fulvic acid (SRFA) as representative DOM. The results showed that simulated sunlight irradiation exhibited negligible effects on the aggregation of PS, while SRFA enhanced its heteroaggregation through hydrophobic interactions. In SRFA solutions, photooxidation of PS with a particle size of 200 nm was observed, which led to an increase in the O/C ratio on its surface at a rate of (2.20 ± 0.40) × 10<sup>-2</sup> h<sup>-1</sup>. This indicates the promotional effect of SRFA on the oxidation of nanosized PS, which is attributed to the generation of the excited triplet state (<sup>3</sup>SRFA*), hydroxyl radicals (<sup>•</sup>OH), and singlet oxygen (<sup>1</sup>O<sub>2</sub>). Among these reactive species, <sup>1</sup>O<sub>2</sub> played a crucial role in the oxidation of PS. The findings in this study are helpful for an in-depth understanding of the environmental behavior of NPs in natural waters.

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