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Roles of microplastic-derived dissolved organic matter on the photodegradation of organic micropollutants

Journal of Hazardous Materials 2022 120 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.

Rui Tang, Muxin Chen, Muxin Chen, Muxin Chen, Muxin Chen, Jihong Xu, Muxin Chen, Rui Tang, Muxin Chen, Muxin Chen, Muxin Chen, Jihong Xu, Yulin Min, Yulin Min, Shoujun Yuan, Yulin Min, Yulin Min, Rui Tang, Rui Tang, Rui Tang, Penghui Shi Penghui Shi Shoujun Yuan, Shoujun Yuan, Shoujun Yuan, Penghui Shi Yulin Min, Yulin Min, Yulin Min, Yulin Min, Qunjie Xu, Qunjie Xu, Penghui Shi Penghui Shi

Summary

Researchers discovered that dissolved organic matter released from weathered microplastics significantly inhibits the photodegradation of the antibiotic sulfamethoxazole in water, primarily through light screening effects, suggesting microplastic pollution may slow the natural breakdown of pharmaceutical contaminants.

Polymers

PE PS

Microplastic-derived dissolved organic matter (MP-DOM) is ubiquitous in water environment and exhibits photosensitivity. However, little is known about the effects of MP-DOM on the photodegradation of organic micropollutants in natural water. In this study, we investigated the effect of MP-DOM derived from two typical plastics, i.e., polystyrene (PS), and polyethylene (PE), on the photodegradation of a typical organic micropollutants sulfamethoxazole (SMX) in a simulative natural water system. MP-DOM exerted a significant inhibition on the SMX photodegradation, mainly attributed to the direct photolysis inhibition of SMX caused by the inner filter effect and the complexation effect. Despite the enhanced reactive oxygen species (ROS) generation with the increase of their steady-state concentration by 41.1 - 160.7 %, PS-DOM exhibited high oxidation resistance, causing an inhibition on the photodegradation of SMX probably through transferring electrons to the SMX intermediates. This study helps to deepen the understanding of microplastic photochemical behavior in natural water.

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