1
|
Efimov M, Vasilev A, Muratov D, Panin A, Malozovskaya M, Karpacheva G. Application of Infrared Pyrolysis and Chemical Post-Activation in the Conversion of Polyethylene Terephthalate Waste into Porous Carbons for Water Purification. Polymers (Basel) 2024; 16:891. [PMID: 38611149 PMCID: PMC11013903 DOI: 10.3390/polym16070891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 03/18/2024] [Accepted: 03/22/2024] [Indexed: 04/14/2024] Open
Abstract
In this study, we compared the conversion of polyethylene terephthalate (PET) into porous carbons for water purification using pyrolysis and post-activation with KOH. Pyrolysis was conducted at 400-850 °C, followed by KOH activation at 850 °C for samples pyrolyzed at 400, 650, and 850 °C. Both pyrolyzed and post-activated carbons showed high specific surface areas, up to 504.2 and 617.7 m2 g-1, respectively. As the pyrolysis temperature increases, the crystallite size of the graphite phase rises simultaneously with a decrease in specific surface area. This phenomenon significantly influences the final specific surface area values of the activated samples. Despite their relatively high specific surface areas, pyrolyzed PET-derived carbons prove unsuitable as adsorbents for purifying aqueous media from methylene blue dye. A sample pyrolyzed at 650 °C, with a surface area of 504.2 m2 g-1, exhibited a maximum adsorption value of only 20.4 mg g-1. We propose that the pyrolyzed samples have a surface coating of amorphous carbon poor in oxygen groups, impeding the diffusion of dye molecules. Conversely, post-activated samples emerge as promising adsorbents, exhibiting a maximum adsorption capacity of up to 127.7 mg g-1. This suggests their potential for efficient dye removal in water purification applications.
Collapse
Affiliation(s)
- Mikhail Efimov
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninskiy Prospekt 29, 119991 Moscow, Russia (G.K.)
| | - Andrey Vasilev
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninskiy Prospekt 29, 119991 Moscow, Russia (G.K.)
- Department of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology “MISiS”, Leninskiy Prospekt 4, 119049 Moscow, Russia
| | - Dmitriy Muratov
- Department of Electronics Materials Technology, National University of Science and Technology “MISiS”, Leninskiy Prospekt 4, 119049 Moscow, Russia
| | - Alexander Panin
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninskiy Prospekt 29, 119991 Moscow, Russia (G.K.)
| | - Maria Malozovskaya
- National Research Center “Kurchatov Institute”, Academic Kurchatov Sq. 1, 123182 Moscow, Russia
| | - Galina Karpacheva
- A.V. Topchiev Institute of Petrochemical Synthesis RAS, Leninskiy Prospekt 29, 119991 Moscow, Russia (G.K.)
| |
Collapse
|
2
|
Saito J, Katte Y, Nagato EG. The molecular level degradation state of drift plastics in the Sea of Japan coastline. MARINE POLLUTION BULLETIN 2023; 197:115707. [PMID: 37883812 DOI: 10.1016/j.marpolbul.2023.115707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 10/05/2023] [Accepted: 10/19/2023] [Indexed: 10/28/2023]
Abstract
Polyethylene (PE) and polyethylene terephthalate (PET) are among the most abundant plastics polluting the oceans. However, their environmental fate depends on how they have been weathered. Due to its unique geography, the Sea of Japan is a pollution hotspot where plastics accumulate. In this study, the structures of plastics, having drifted into the Sea of Japan coastline environment, were analyzed with a particular focus on examining polymer crystallization and carbonyl formation; two factors which influence microplastic formation and the adsorption of contaminants onto plastic surfaces. PE in the coastal environment did not show evidence of crystallization, although carbonyl formation did increase. By contrast, PET bottles were shown to not be uniform in structure, with unaged bottles being less crystalline in the neck component compared to the body. Because of this difference, in environmental PET bottles, it was the bottle neck that showed increases in crystallization and carbonyl group formation.
Collapse
Affiliation(s)
- Junya Saito
- Shimane University, Faculty of Life and Environmental Science, 690-8504 Matsue, Japan
| | - Yasuharu Katte
- Shimane University, Faculty of Life and Environmental Science, 690-8504 Matsue, Japan
| | - Edward G Nagato
- Shimane University, Faculty of Life and Environmental Science, 690-8504 Matsue, Japan.
| |
Collapse
|
3
|
Motloung MP, Mofokeng TG, Mokhena TC, Ray SS. Recent advances on melt-spun fibers from biodegradable polymers and their composites. INT POLYM PROC 2022. [DOI: 10.1515/ipp-2022-0023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Biodegradable polymers have become important in different fields of application, where biodegradability and biocompatibility are required. Herein, the melt spinning of biodegradable polymers including poly(lactic acid), poly(butylene succinate), polyhydroxyalkanoate (PHA), poly(ɛ-caprolactone) and their biocomposites is critically reviewed. Biodegradable polymer fibers with added functionalities are in high demand for various applications, including biomedical, textiles, and others. Melt spinning is a suitable technique for the development of biodegradable polymer fibers in a large-scale quantity, and fibers with a high surface area can be obtained with this technique. The processing variables during spinning have a considerable impact on the resulting properties of the fibers. Therefore, in this review, the processing-property relationship in biodegradable polymers, blends, and their composites is provided. The morphological characteristics, load-bearing properties, and the potential application of melt-spun biodegradable fibers in various sectors are also provided.
Collapse
Affiliation(s)
- Mpho Phillip Motloung
- Centre for Nanostructures and Advanced Materials, DSI-CSIR Nanotechnology Innovation Centre , Council for Scientific and Industrial Research , Pretoria 0001 , South Africa
- Department of Chemical Sciences , University of Johannesburg , Doornfontein 2028 , Johannesburg , South Africa
| | - Tladi Gideon Mofokeng
- Centre for Nanostructures and Advanced Materials, DSI-CSIR Nanotechnology Innovation Centre , Council for Scientific and Industrial Research , Pretoria 0001 , South Africa
| | - Teboho Clement Mokhena
- Nanotechnology Innovation Centre (NIC), Advanced Materials Division , Mintek , Randburg 2125 , South Africa
| | - Suprakas Sinha Ray
- Centre for Nanostructures and Advanced Materials, DSI-CSIR Nanotechnology Innovation Centre , Council for Scientific and Industrial Research , Pretoria 0001 , South Africa
- Department of Chemical Sciences , University of Johannesburg , Doornfontein 2028 , Johannesburg , South Africa
| |
Collapse
|
4
|
Effects of Nanoscale Morphology on Optical Properties of Photoluminescent Polymer Optical Fibers. Polymers (Basel) 2022; 14:polym14163262. [PMID: 36015517 PMCID: PMC9412683 DOI: 10.3390/polym14163262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 07/19/2022] [Accepted: 07/26/2022] [Indexed: 11/16/2022] Open
Abstract
Bicomponent photoluminescent polymer optical fibers (PL-POFs) have been melt-spun and in-situ drawn to different extents. The results suggest that scattering in the sheath can effectively increase the photoluminescent dye excitation probability in the fiber core. The core/sheath PL-POFs are made of a semi-crystalline fluoropolymer sheath of low refractive index (RI) and an amorphous cycloolefin polymeric core of high RI, which is doped with a luminescent dye. The axial light emission, as well as the guiding attenuation coefficients of the core/sheath PL-POFs, have been measured using a side-illumination set-up. The incident blue laser is down-converted to red light, which is re-emitted and partially guided by the core. The axial light emission is measured at the fiber tip as a function of the distance of the illumination position to the integrating sphere. It is demonstrated that the presence of a semi-crystalline sheath significantly enhances the axial light emission and that it also lowers the attenuation coefficient, compared to the emission and guiding properties of PL core-only fibers. Additionally, the attenuation coefficient has been found to be lower in more strongly drawn PL-POFs. Wide-angle X-ray diffraction and small-angle X-ray scattering experiments reveal structural differences in differently drawn PL-POFs that can be linked to the observed differences in the optical properties.
Collapse
|
5
|
Recyclability of Opaque PET from High Speed Melt Spinning: Determination of the Structures and Properties of Filaments. Polymers (Basel) 2022; 14:polym14112235. [PMID: 35683911 PMCID: PMC9182581 DOI: 10.3390/polym14112235] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 05/22/2022] [Accepted: 05/23/2022] [Indexed: 02/04/2023] Open
Abstract
Recycling opaque Polyethylene terephthalate (PET), which contains 1 to 10 wt % TiO2 submicron particles, has become of interest in the past few years. However, the bottle-to-fiber recyclability of opaque PET has not been assessed yet. In this work, opaque PET packaging has been characterized, and high-speed melt-spun filaments with different amounts of opaque PET (30–50–100%) blended with standard transparent recycled PET (rPET) have been produced in a pilot system. The opaque PET filaments produced have also been compared to a transparent rPET blend with masterbatch PET/TiO2 at different amounts of filler (1–3–6 wt %), produced with the same parameters. The structure-properties relationship of rPET melt-spun fibers has been investigated with crystallinity measurements, amorphous and crystalline phases orientation, and tenacity. It has been observed that the degree of crystallinity, the crystalline and amorphous phases orientation and the tenacity decreases with opaque PET addition and, to a lesser extent, with TiO2 addition. It has been suggested that TiO2 particles are not entirely responsible for the decrease in mechanical properties of opaque PET filaments since opaque rPET filaments have inferior properties to r-PET/TiO2 filaments at the same filler content.
Collapse
|
6
|
Selli F, Hufenus R, Gooneie A, Erdoğan UH, Perret E. Structure-Property Relationship in Melt-Spun Poly(hydroxybutyrate-co-3-hexanoate) Monofilaments. Polymers (Basel) 2022; 14:200. [PMID: 35012222 PMCID: PMC8747132 DOI: 10.3390/polym14010200] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/13/2021] [Accepted: 12/23/2021] [Indexed: 11/16/2022] Open
Abstract
Poly(hydroxybutyrate-co-3-hexanoate) (PHBH) is a biodegradable thermoplastic polyester with the potential to be used in textile and medical applications. We have aimed at developing an upscalable melt-spinning method to produce fine biodegradable PHBH filaments without the use of an ice water bath or offline drawing techniques. We have evaluated the effect of different polymer grades (mol% 3-hydroxy hexanoate, molecular weight etc.) and production parameters on the tensile properties of melt-spun filaments. PHBH monofilaments (diameter < 130 µm) have been successfully melt-spun and online drawn from three different polymer grades. We report thermal and rheological properties of the polymer grades as well as morphological, thermal, mechanical, and structural properties of the melt-spun filaments thereof. Tensile strengths up to 291 MPa have been achieved. Differences in tensile performance have been correlated to structural differences with wide-angle X-ray diffraction and small-angle X-ray scattering. The measurements obtained have revealed that a synergetic interaction of a highly oriented non-crystalline mesophase with highly oriented α-crystals leads to increased tensile strength. Additionally, the effect of aging on the structure and tensile performance has been investigated.
Collapse
Affiliation(s)
- Figen Selli
- Department of Textile Engineering, Dokuz Eylul University, Izmir 35397, Turkey; (F.S.); (U.H.E.)
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland; (R.H.); (A.G.)
| | - Rudolf Hufenus
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland; (R.H.); (A.G.)
| | - Ali Gooneie
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland; (R.H.); (A.G.)
| | - Umit Halis Erdoğan
- Department of Textile Engineering, Dokuz Eylul University, Izmir 35397, Turkey; (F.S.); (U.H.E.)
| | - Edith Perret
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland; (R.H.); (A.G.)
- Center for X-ray Analytics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
| |
Collapse
|
7
|
Huss-Hansen MK, Hedlund EG, Davydok A, Hansteen M, Overdijk J, de Cremer G, Roeffaers M, Knaapila M, Balzano L. Local structure mapping of gel-spun ultrahigh-molecular-weight polyethylene fibers. POLYMER 2022. [DOI: 10.1016/j.polymer.2021.124420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
8
|
Perret E, Chen K, Braun O, Muff R, Hufenus R. Radial gradients in PET monofilaments: A Raman mapping and SAXS tomography study. POLYMER 2022. [DOI: 10.1016/j.polymer.2021.124422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
9
|
Fitting of 2D WAXD data: Mesophases in polymer fibers. Data Brief 2021; 39:107466. [PMID: 34703857 PMCID: PMC8521234 DOI: 10.1016/j.dib.2021.107466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 09/08/2021] [Accepted: 10/05/2021] [Indexed: 11/27/2022] Open
Abstract
This data article presents fitting results of wide-angle x-ray diffraction (WAXD) patterns of melt-spun polymer fibers from amorphous materials (polycarbonate (PC), cyclo-olefin polymer (COP), copolyamide (coPA), polyethylene terephthalate glycol (PETG)) and semi-crystalline materials (polyethylene terephthalate (PET), poly-3-hydroxybutyrate(P3HB)). The data was fit using the fitting algorithms, previously described in the publication by Perret and Hufenus ‘Insights into strain-induced solid mesophases in melt-spun polymer fibers’ [1]. Fitting results of WAXD data and details about azimuthal, equatorial, meridional or off-axis profiles are presented in sections 1.1-1.2. SAXS patterns of fibers, melt-spun from amorphous materials, are shown in section 1.3. Fiber production parameters are given in section 2.1, and a description of the WAXD measurements and fitting details, e.g., the chosen fitting parameters, are given in section 2.2.
Collapse
|
10
|
Sharma K, Braun O, Tritsch S, Muff R, Hufenus R, Perret E. 2D Raman, ATR-FTIR, WAXD, SAXS and DSC data of PET mono- and PET/PA6 bicomponent filaments. Data Brief 2021; 38:107416. [PMID: 34632014 PMCID: PMC8488250 DOI: 10.1016/j.dib.2021.107416] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 09/06/2021] [Accepted: 09/20/2021] [Indexed: 10/26/2022] Open
Abstract
This data in brief article summarizes structural data obtained from monocomponent melt-spun and offline drawn poly(ethylene terephthalate) (PET) monofilaments, as well as from melt-spun bicomponent core-sheath PET-polyamide 6 (PA6) filaments. The diameters of the single filaments range from 27 µm to 79 µm. Presented analysis techniques and results thereof are (i) Raman mapping of filament cross-sections: 2D maps of peak positions, widths, peak area ratios; (ii) attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR): ATR-FTIR spectra and extraction of surface crystallinity; (iii) wide-angle x-ray diffraction (WAXD): WAXD patterns and extraction of average crystallinity; (iv) small-angle x-ray scattering (SAXS): SAXS patterns and determined crystallite sizes and long-spacings; (v) differential scanning calorimetry (DSC): thermograms and extracted average crystallinity as well as thermal properties; (vi) atomic force microscopy (AFM): AFM image of the surface of an embedded fiber cross-section. For more information, see the publication by E. Perret et al. 'High-resolution 2D Raman mapping of mono- and bicomponent filament cross-sections' [1].
Collapse
Affiliation(s)
- K Sharma
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, St. Gallen 9014, Switzerland.,KTH Royal Institute of Technology, Stockholm 114 16 Sweden
| | - O Braun
- Transport at Nanoscale Interfaces Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf 8600, Switzerland.,Department of Physics, University of Basel, Klingelbergstrasse 82, Basel 4056, Switzerland
| | - S Tritsch
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, St. Gallen 9014, Switzerland.,Hochschule Reutlingen, Alteburgstrasse 150, Reutlingen 72762, Germany
| | - R Muff
- Transport at Nanoscale Interfaces Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf 8600, Switzerland
| | - R Hufenus
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, St. Gallen 9014, Switzerland
| | - E Perret
- Laboratory for Advanced Fibers, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, St. Gallen 9014, Switzerland.,Center for X-ray Analytics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf 8600, Switzerland
| |
Collapse
|
11
|
|