Visible light photocatalytic degradation of polypropylene microplastics in a continuous water flow system

Uheida, Abdusalam; Mejía, Hugo Fernando Giraldo; Abdel‐Rehim, Mohamed; Hamd, Wael; Dutta, Joydeep

doi:10.1016/j.jhazmat.2020.124299

Cited by 350 publications

(105 citation statements)

References 55 publications

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“…The ZnO NRs/SnO x / Fe 0 NPs composite was then immobilized on glass fibers substrate in order to tarp the circulated microplastics particles suspended in water. The growth of ZnO NRs on the glass fibers is described elsewhere (Uheida et al, 2021). In brief, ZnO nanocrystallite seeds were deposited on glass fibers substrates of about 1 g, pre-heated to 350 C, by spraying 20 ml of zinc acetate dehydrate solution with concentration of 10 mM at flow rate of about 1 ml/min.…”

Section: Methodsmentioning

confidence: 99%

“…Advanced oxidation processes (AOPs) including Fenton reaction, ozonation or electrochemical treatment are applied in the degradation of organic waste in water (Nakata and Fujishima, 2012) and recently have been extended to microplastic remediation (Hu et al, 2021). In principle, the combination of photocatalysis (Tofa et al, 2019a,b;Uheida et al, 2021) and Fenton processes (Hamd and Dutta, 2020) could lead to a faster photogenerated electron production, and the rapidly transferred electrons to iron reduce its state from Fe 3+ to Fe 2+ leading to the charge separation and resultant Fenton processes. The regenerated Fe 2+ increases a fast production of strong hydroxyl radicals (•OH) leading to a rapid degradation of the organic molecules.…”

Section: Introductionmentioning

confidence: 99%

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Ecosafety Screening of Photo-Fenton Process for the Degradation of Microplastics in Water

et al. 2022

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Microplastic pollution is receiving increased attention due to the realization of its hazards to aquatic and human life. Researchers across the globe are attempting to remove microplastics before its entry into the ecosystem. Therefore, the present work focused on the removal of microplastic from water and studied the potential risks for marine organisms and the ecosystem. The removal of model microplastics, polypropylene (PP) and polyvinyl chloride (PVC), has been studied by using photo-Fenton process. ZnO nanorods coated with SnOx(x < 2) layer and decorated with zero valent iron (Fe0) nanoparticles was used as heterogeneous catalyst for the removal of the microplastics in continuous water flow device. The obtained results demonstrated that high degradation efficiency of PP and PVC microplastics was achieved in a relatively short time and more than 95% of the average particle volume was reduced after 1 week of irradiation. The environmental impact of the photo-Fenton process of the microplastics degradation was investigated by using an ecotoxicological approach. An ecosafety screening has been performed through a series of experiments (bioassays) under controlled conditions, testing water samples after the photo-Fenton degradation of microparticles using a lab scale device. The ecotoxicological impact has been investigated by applying a battery of certified bioassays (UNI EN ISO/EPA standardized techniques) on aquatic organisms at different trophic levels (bacteria, algae, invertebrates). The results obtained on the three model organisms (A. fischeri, P. subcapitata, and D. magna) revealed no toxic effect for samples collected both before and after the photo-Fenton process, thus showing the absence of toxic by-products development during the degradation process.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ecosafety Screening of Photo-Fenton Process for the Degradation of Microplastics in Water

et al. 2022

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“…Uheida et al tested the degradation of low-density polyethylene (LDPE) microplastic residues by irradiating zinc oxide nanorods (ZnO NRs) with visible light. The results of the study showed that the degradation rate of polymer residues was 30% [51]. Kang et al found that the degradation of 50% of microplastics in water bodies within 8 hours was achieved by the action of sulfate radicals and hydroxyl radicals [52].…”

Section: Chemical Treatment Technologymentioning

confidence: 98%

Hazards and Improvement Measures of Microplastic Pollution: A Review

Gan

Tian

et al. 2021

E3S Web Conf.

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Microplastics is one category of plastics with relatively small diameter and is considered as the common ingredient of waste accumulation zone in oceans. However, since countless plastic products are emitted into oceans annually as waste all around the world, pollution caused by them is severe and the resulting problems have attracted attention globally, while current policies and cooperation around the globe for tackling microplastics pollution still need to be improved. To deal with microplatics-related problems in the ocean, our review first discussed the toxicity of microplastics based on previous research related to marine microplastics, which was caused by the plastics themselves and their leaching substances with impacts on marine creatures and human body along the food chain. After summarizing some measures that have been already performed, we suggested that the authority should take more actions to mitigate those problems resulted from microplastics, pay more attention on researching, and encourage citizens to offer their proposals. By finally analyzing the advantages and disadvantages of different handling methods, as well as physical, chemical, and biological treatment technologies on oceanic microplastic issues, our work provided experience on disposing microplastics waste under various actual situations with an example for more holistic waste treatment.

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“…The toxicity of by-products formed during photochemical and photocatalytic oxidation strongly depends on the polymer origin. For example, it was reported that products of photochemical oxidation of PP microplastics reveal low toxicity to humans and to the living species in the aquatic environment [85]. The issue of the formation of toxic by-products occurring during microplastic degradation has not been adequately treated yet.…”

Section: Photocatalytic Degradationmentioning

confidence: 99%

Notes on Common Misconceptions in Microplastics Removal from Water

et al. 2021

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Occurrence of microplastics in the environment has become a serious problem with too many variables and unknowns regarding their relationship not only with human health but also with other parts of the environment. The toxic and ecotoxic properties are still a subject of interest and the scientific attitude to their threat is not unified. There are numerous review papers which report on microplastic particles occurrence in water, but similarly complex reviews on methods of their removal are not that frequent. This paper aims to provide a brief overview summarizing the most tested methods of microplastics removal and intends to critically evaluate them accordingly and advert to their discrepancies.

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Visible light photocatalytic degradation of polypropylene microplastics in a continuous water flow system

Cited by 350 publications

References 55 publications

Ecosafety Screening of Photo-Fenton Process for the Degradation of Microplastics in Water

Ecosafety Screening of Photo-Fenton Process for the Degradation of Microplastics in Water

Hazards and Improvement Measures of Microplastic Pollution: A Review

Notes on Common Misconceptions in Microplastics Removal from Water

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