Degradation degree analysis of environmental microplastics by micro FT-IR imaging technology

Chen, Xi; Xu, Mingqiang; Yuan, Lei‐ming; Huang, Guangzao; Chen, Xiaojing; Shi, Wen

doi:10.1016/j.chemosphere.2021.129779

Cited by 32 publications

(13 citation statements)

References 22 publications

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“…In general, spectral indices are not adequate to quantify the aging time of plastics because their behaviors are not linear [ 10 ], the chemical properties of MPs change in various ways after aging depending on environmental conditions [ 22 ]; however, there is a relationship between the YI and the formation of new carbonyl groups [ 51 ].…”

Section: Resultsmentioning

confidence: 99%

Yellowing, Weathering and Degradation of Marine Pellets and Their Influence on the Adsorption of Chemical Pollutants

Abaroa-Pérez¹,

Ortiz-Montosa

Hernández‐Brito

et al. 2022

Polymers

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Marine microplastics (MPs) are exposed to environmental factors, which produce aging, weathering, surface cracking, yellowing, fragmentation and degradation, thereby changing the structure and behavior of the plastic. This degradation also has an influence on the adsorption of persistent organic pollutants over the microplastic surface, leading to increased concentration with aging. The degradation state affects the microplastic color over time; this is called yellowing, which can be quantified using the Yellowness Index (YI). Weathering and surface cracking is also related with the microplastic yellowing, which can be identified by Fourier transform infrared spectroscopy (FTIR). In this study, the degradation state of marine microplastic polyethylene pellets with different aging stages is evaluated and quantified with YI determination and the analysis of FTIR spectrums. A color palette, which relates to the microplastic color and YI, was developed to obtain a visual percentage of this index. The relation with the adsorption rate of persistent organic pollutant over the microplastic surface was also determined.

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Section: Resultsmentioning

confidence: 99%

Yellowing, Weathering and Degradation of Marine Pellets and Their Influence on the Adsorption of Chemical Pollutants

Abaroa-Pérez¹,

Ortiz-Montosa

Hernández‐Brito

et al. 2022

Polymers

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“…When ATR μ-FTIR was used to identify the change in functional groups on the surfaces of MPs, hydroxylation (−OH: 3650–3200 cm –1 , 1100–1030 cm –1 ) and carbonylation (CO: 1779–1680 cm –1 ) could be observed on the surfaces of aged MPs. The oxidation level of polymers can be evaluated based on the CI of the polymer surface, which was calculated as the ratio of the absorbance area of carbonyl groups (between 1779 and 1680 cm –1 ) and the absorbance area of the internal reference, e.g., methylene, which are seen at 1490 and 1420 cm –1 for PE. , Considering that PE is the most commonly detected polymer in landfills, the CI of PE could be used to assess the degree of MP degradation in the landfill process. The CI of PE films in landfills was much higher than that of fresh PE.…”

Section: Results and Discussionmentioning

confidence: 99%

Comparison of Detection Methods of Microplastics in Landfill Mineralized Refuse and Selection of Degradation Degree Indexes

Zhang

Peng

et al. 2021

Environ. Sci. Technol.

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A landfill is an important sink of plastic waste and potential sources of microplastics (MPs) when mineralized refuse is reused. However, limitations are still present in quantifying MPs in mineralized refuse and assessing their degradation degree. In this study, laser direct infrared spectroscopy and liquid chromatography-tandem mass spectrometry (LC-MS/MS) were used to identify MPs of mineralized refuse from a landfill. Although 25− 113 items/g MPs were detected in particles subjected to flotation, 37.9−674 μg/g polyethylene terephthalate (PET) and 0.0716− 1.01 μg/g polycarbonate (PC) were detected in the residual solids by LC-MS/MS, indicating a great amount of plastic polymers still presented in the residue. This suggests that the commonly used flotation-counting method will lead to significant underestimation of MP pollution in mineralized refuse, which might be due to the aging and aggregation process caused by the long-term landfill process. The ratio of "bisphenol A/PC" and "plasticizer/MPs" was found to be positively correlated and negatively correlated with the landfill age, respectively. Therefore, in addition to the spectral index such as the carbonyl index, new indexes based on the concentrations of polymers, free monomers, and plasticizers were proposed to characterize the degradation degree of MPs in a landfill.

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“…On the contrary, well-established techniques are Fouriertransform infrared spectroscopy (FITR), Raman spectroscopy, and mass spectrometry methods. [46][47][48] The latter allows quali-tative and quantitative determination of degradation products, which permits the evaluation of degradation pathways and potential secondary pollution. For instance, pyrolysis-gas chromatography-mass spectrometry (Pyr-GC-MS) provided information on byproducts formed during the aging of various microplastics, [49] while size exclusion chromatography (SEC) disclosed the reduction of their molecular weight due to the induced oxidation.…”

Section: Motion Mechanisms Of Nano/microrobots Against Nano/microplas...mentioning

confidence: 99%

Nano/Microplastics Capture and Degradation by Autonomous Nano/Microrobots: A Perspective

Urso

Pumera

2022

Adv Funct Materials

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The growing use of plastic materials has led to the continuous accumulation of wastes in marine environments, which fragment into hazardous micro‐and nanoplastics. These plastic particles absorb toxic organic pollutants on their surface, support bacterial biofilms growth, and propagate through the food chain, posing serious risks for human health. Therefore, nano/microplastics pollution has become a global issue, making their definitive elimination compulsory. Self‐propelled nano/microrobots have demonstrated efficient removal of nano/microplastics from water, combining enhanced physicochemical properties of nano/microscale materials and active motion. During the last year, the potential of this technology to degrade nano/microplastics has been investigated. Here, the most advanced strategies for nano/microplastics capture and subsequent degradation by autonomous nano/microrobots are critically reviewed. A short introduction to the main propulsion mechanisms and experimental techniques for studying nano/microplastics degradation is also provided. Forthcoming challenges in this research field are discussed proactively. This perspective inspires future nano/microrobotic designs and approaches for water purification from nano/microplastics and other emerging pollutants.

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Degradation degree analysis of environmental microplastics by micro FT-IR imaging technology

Cited by 32 publications

References 22 publications

Yellowing, Weathering and Degradation of Marine Pellets and Their Influence on the Adsorption of Chemical Pollutants

Yellowing, Weathering and Degradation of Marine Pellets and Their Influence on the Adsorption of Chemical Pollutants

Comparison of Detection Methods of Microplastics in Landfill Mineralized Refuse and Selection of Degradation Degree Indexes

Nano/Microplastics Capture and Degradation by Autonomous Nano/Microrobots: A Perspective

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