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Insight into the Photodegradation of Microplastics Boosted by Iron (Hydr)oxides

Environmental Science & Technology 2022 78 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.

Xuetao Guo Peng Liu, Ling Ding, Zhuozhi Ouyang, Peng Liu, Peng Liu, Ling Ding, Peng Liu, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Ling Ding, Ling Ding, Peng Liu, Ling Ding, Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Hanzhong Jia, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Peng Liu, Peng Liu, Peng Liu, Peng Liu, Peng Liu, Peng Liu, Peng Liu, Zhuozhi Ouyang, Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Xuetao Guo Hanzhong Jia, Zhuozhi Ouyang, Hanzhong Jia, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Shengwen Du, Shengwen Du, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Peng Liu, Peng Liu, Peng Liu, Peng Liu, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Fengyi Cui, Hanzhong Jia, 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 Peng Liu, Peng Liu, Peng Liu, Peng Liu, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Fengyi Cui, Yaping Zhang, Yaping Zhang, Lingyan Zhu, Zhuozhi Ouyang, Lingyan Zhu, Xuetao Guo Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Xuetao Guo Xuetao Guo Zhuozhi Ouyang, Xuetao Guo Hanzhong Jia, Xuetao Guo Hanzhong Jia, Zhuozhi Ouyang, Xuetao Guo Xuetao Guo Zhuozhi Ouyang, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Xuetao Guo Zhuozhi Ouyang, Xuetao Guo Hanzhong Jia, Hanzhong Jia, Zhuozhi Ouyang, Ling Ding, Xuetao Guo Hanzhong Jia, Xuetao Guo Hanzhong Jia, Peng Liu, Xuetao Guo 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 Hanzhong Jia, Xuetao Guo Xuetao Guo Hanzhong Jia, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Peng Liu, Peng Liu, Zhuozhi Ouyang, Peng Liu, Peng Liu, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Zhuozhi Ouyang, Hanzhong Jia, Xuetao Guo Hanzhong Jia, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Xuetao Guo Xuetao Guo Xuetao Guo Lingyan Zhu, Lingyan Zhu, Xuetao Guo Lingyan Zhu, Zhuozhi Ouyang, Lingyan Zhu, Lingyan Zhu, Peng Liu, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Hanzhong Jia, Xuetao Guo Peng Liu, Xuetao Guo Hanzhong Jia, Xuetao Guo Hanzhong Jia, Hanzhong Jia, Xuetao Guo Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Zhuozhi Ouyang, Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Xuetao Guo Hanzhong Jia, Hanzhong Jia, Peng Liu, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Hanzhong Jia, Peng Liu, Xuetao Guo Zhuozhi Ouyang, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Lingyan Zhu, Xuetao Guo Lingyan Zhu, Xuetao Guo Xuetao Guo Xuetao Guo Lingyan Zhu, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Peng Liu, Hanzhong Jia, Lingyan Zhu, Xuetao Guo Hanzhong Jia, Hanzhong Jia, Xuetao Guo Xuetao Guo Hanzhong Jia, Xuetao Guo Lingyan Zhu, Xuetao Guo Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Xuetao Guo Xuetao Guo Hanzhong Jia, Hanzhong Jia, Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Xuetao Guo Xuetao Guo Xuetao Guo Hanzhong Jia, Lingyan Zhu, Xuetao Guo Hanzhong Jia, Hanzhong Jia, Xuetao Guo Hanzhong Jia, Lingyan Zhu, Xuetao Guo

Summary

Iron (hydr)oxide minerals goethite and hematite were found to significantly accelerate the photodegradation of polyethylene and polypropylene microplastics under simulated sunlight, with goethite showing greater effect due to higher hydroxyl radical production via a light-driven Fenton reaction. The study reveals a previously overlooked natural mechanism by which common soil minerals can influence the environmental fate of microplastics.

Polymers

PE PP

Iron (hydr)oxides as a kind of natural mineral actively participate in the transformation of organic pollutants, but there is a large knowledge gap in their impacts on photochemical processes of microplastics (MPs). This study is the first to examine the degradation of two ordinary plastic materials, polyethylene (PE) and polypropylene (PP), mediated by iron (hydr)oxides (goethite and hematite) under simulated solar light irradiation. Both iron (hydr)oxides significantly promoted the degradation of MPs (particularly PP) with a greater effect by goethite than hematite, related to hydroxyl radical (•OH) produced by iron (hydr)oxides. Under light irradiation, the surface Fe(II) phase catalyzed the production of H2O2 and promoted the release of Fe2+, leading to the subsequent light-driven Fenton reaction which produced a large amount of •OH. As the iron (hydr)oxides were modified with NaF at various concentrations, the activity of the surface Fe(II) as well as the release of Fe2+ were greatly reduced, and thus the •OH formation and MP degradation were depressed remarkably. It is worth noting that the surface hydroxyl groups (especially ≡FeOH) affected the reaction kinetics of •OH by regulating the activity of Fe species. These findings unveil the distinct impacts and intrinsic mechanisms of iron (hydr)oxides in influencing the photodegradation of MPs.

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