Infrared Spectral Analysis of Waste Pet Samples

Vijayakumar, S.; Rajakumar, P.R.

doi:10.56431/p-0wwmqk

Cited by 12 publications

(4 citation statements)

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“…The spectra for the two fibers analyzed by SR -FTIR are shown in Fig. 4, which displays the characteristic carbonyl stretching peak at about 1710 cm −1 (Vijayakumar and Rajakumar, 2012). The maximum absorbance of this strong characteristic peak could appear shifted due to differences in the degree of crystallinity and chain orientation on deformation, which is the most probable reason explaining the difference between the two fibers shown in Fig.…”

Section: Identification and Quantification Of Microparticlesmentioning

confidence: 99%

Fibers spreading worldwide: Microplastics and other anthropogenic litter in an Arctic freshwater lake

González-Pleiter

Velázquez

Edo

et al. 2020

Science of The Total Environment

152

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Section: Identification and Quantification Of Microparticlesmentioning

confidence: 99%

Fibers spreading worldwide: Microplastics and other anthropogenic litter in an Arctic freshwater lake

González-Pleiter

Velázquez

Edo

et al. 2020

Science of The Total Environment

152

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“…The PET recalcitrance characteristics discourage depolymerization studies, causing little information to be available in the literature on polymer analyses using FTIR. According to Holland and Hay [ 72 ] and Vijayakumar and Rajakumar [ 73 ], the spectra from bottles must contain some vibrations from groups that confirm the presence of important chemical bonds functioning as “fingerprints” for that material. They may be 1713 cm −1 (presence of carbonyl group C=O conjugated to the aromatic ring), 1234 cm −1 (asymmetric C-C-O stretching involving carbon in the aromatic ring), 728 cm −1 (aromatic ring C-H movement outside the plane), 872 cm −1 (C-H stretching of the aromatic ring outside the plane), 1128 cm −1 and 1091 cm −1 (O-C-C split asymmetric stretching), 2960 cm −1 (asymmetric stretching of C-H), 1505 cm −1 (aromatic ring C-C stretching), 1453 cm −1 (deviation/folding of C-H), and bands at 1408 cm −1 and 1339 cm −1 (C-H deformation of the alkane).…”

Section: Discussionmentioning

confidence: 99%

Fungal Screening for Potential PET Depolymerization

et al. 2023

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Approximately 400 billion PET bottles are produced annually in the world, of which from 8 to 9 million tons are discarded in oceans. This requires developing strategies to urgently recycle them. PET recycling can be carried out using the microbial hydrolysis of polymers when monomers and oligomers are released. Exploring the metabolic activity of fungi is an environmentally friendly way to treat harmful polymeric waste and obtain the production of monomers. The present study addressed: (i) the investigation of potential of strains with the potential for the depolymerization of PET bottles from different manufacturers (crystallinity of 35.5 and 10.4%); (ii) the search for a culture medium that favors the depolymerization process; and (iii) gaining more knowledge on fungal enzymes that can be applied to PET recycling. Four strains (from 100 fungal strains) were found as promising for conversion into terephthalic acid from PET nanoparticles (npPET): Curvularia trifolii CBMAI 2111, Trichoderma sp. CBMAI 2071, Trichoderma atroviride CBMAI 2073, and Cladosporium cladosporioides CBMAI 2075. The fermentation assays in the presence of PET led to the release of terephthalic acid in concentrations above 12 ppm. Biodegradation was also confirmed using mass variation analyses (reducing mass), scanning electron microscopy (SEM) that showed evidence of material roughness, FTIR analysis that showed band modification, enzymatic activities detected for lipase, and esterase and cutinase, confirmed by monomers/oligomers quantification using high performance liquid chromatography (HPLC-UV). Based on the microbial strains PET depolymerization, the results are promising for the exploration of the selected microbial strain.

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“…The PEC membranes presented these two bands plus one more in the region of 1720 cm À1 , which corresponds to the ester C O of SPET. 51,52 The intensity map is related to the C O stretching of the ester of SPET. 52 On the scale, yellow denotes the greater intensity of this band and, therefore, a greater amount of the polyanion.…”

Section: Atomic Force Microscopymentioning

confidence: 99%

“…51,52 The intensity map is related to the C O stretching of the ester of SPET. 52 On the scale, yellow denotes the greater intensity of this band and, therefore, a greater amount of the polyanion. In contrast, more intense red denotes a lower concentration.…”

Section: Atomic Force Microscopymentioning

confidence: 99%

Surface characterization and Remazol Red adsorption by asymmetric polyethersulfone membranes modified by polyelectrolyte complexes

da Silva Vale,

Bezerra da Silva,

Marcio Paranhos

et al. 2024

J of Applied Polymer Sci

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Polyethersulfone (PES) membranes containing 4‐fluorophenyl sulfone‐terminated poly(diallylpiperidinium hexafluorophosphate)‐sulfonated poly(ethylene terephthalate) polyelectrolyte complexes (PECs) were obtained via phase inversion using three different methods that enabled the complexation of polyelectrolytes (PELs) to occur before, after, and during membrane formation. Atomic force microscopy‐infrared spectroscopy analysis revealed varying concentrations of the polyanion depending on the preparation method and confirmed the presence of PECs in the membranes, highlighting an increase in surface roughness. Zeta potential measurements demonstrated positive surface charges for the membrane comprising PES and the polycation. The reduction in zeta potential in PEC membranes corresponded with the neutralization of positive groups by sulfonated poly(ethylene terephthalate. Scanning electron microscopy micrographs depicted surface imperfections in PEC membranes, emphasizing the influence of PECs on membrane surfaces. The water contact angle decreased, indicating increased hydrophilicity in PEC membranes. Additionally, dye adsorption results showcased significant adsorption, with the membranes absorbing at least 60% of Remazol Red from an aqueous solution. Notably, the Blend membrane outperformed others, exhibiting an exceptional adsorption rate exceeding 92%.

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Infrared Spectral Analysis of Waste Pet Samples

Cited by 12 publications

References 0 publications

Fibers spreading worldwide: Microplastics and other anthropogenic litter in an Arctic freshwater lake

Fibers spreading worldwide: Microplastics and other anthropogenic litter in an Arctic freshwater lake

Fungal Screening for Potential PET Depolymerization

Surface characterization and Remazol Red adsorption by asymmetric polyethersulfone membranes modified by polyelectrolyte complexes

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