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Tytuł:
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Insight into the Photodegradation of Microplastics Boosted by Iron (Hydr)oxides.
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Autorzy:
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Ding L; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
Guo X; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.; Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China.
Du S; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
Cui F; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
Zhang Y; School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China.
Liu P; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.; Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China.
Ouyang Z; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.; Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China.
Jia H; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.; Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China.
Zhu L; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.; Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China.
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Źródło:
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Environmental science & technology [Environ Sci Technol] 2022 Dec 20; Vol. 56 (24), pp. 17785-17794. Date of Electronic Publication: 2022 Dec 06.
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Typ publikacji:
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Journal Article; Research Support, Non-U.S. Gov't
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Język:
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English
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Imprint Name(s):
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Publication: Washington DC : American Chemical Society
Original Publication: Easton, Pa. : American Chemical Society, c1967-
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MeSH Terms:
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Iron*
Oxides*
Microplastics ; Plastics ; Photolysis ; Hydrogen Peroxide ; Ferric Compounds ; Oxidation-Reduction ; Ferrous Compounds
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Contributed Indexing:
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Keywords: iron (hydr)oxides; microplastics; photodegradation; surface hydroxyl groups
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Substance Nomenclature:
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E1UOL152H7 (Iron)
1310-14-1 (goethite)
1K09F3G675 (ferric oxide)
0 (Oxides)
0 (Microplastics)
0 (Plastics)
BBX060AN9V (Hydrogen Peroxide)
0 (Ferric Compounds)
0 (Ferrous Compounds)
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Entry Date(s):
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Date Created: 20221206 Date Completed: 20221221 Latest Revision: 20230105
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Update Code:
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20240104
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DOI:
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10.1021/acs.est.2c07824
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PMID:
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36472936
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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 H 2 O 2 and promoted the release of Fe 2+ , 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 Fe 2+ 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.