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Teke S, Saud S, Bhattarai RM, Ali A, Nguyen L, Denra A, Nguyen DB, Mok YS. Optimization of PET depolymerization for enhanced terephthalic acid recovery from commercial PET and post consumer PET-bottles via low-temperature alkaline hydrolysis. CHEMOSPHERE 2024; 365:143391. [PMID: 39307467 DOI: 10.1016/j.chemosphere.2024.143391] [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: 07/13/2024] [Revised: 09/19/2024] [Accepted: 09/20/2024] [Indexed: 10/01/2024]
Abstract
The increasing demand for plastic has resulted in a surge in plastic waste production. Polyethylene terephthalate (PET), commonly used in beverage bottle manufacturing, is only partially recycled, with an estimated recycling rate of just 28.4% in 2019. This accumulation of plastic waste is harmful to the environment and living organisms, necessitating effective recycling methods for PET waste. One promising method is alkaline hydrolysis using NaOH, which can break down PET into its monomer components, terephthalic acid (TPA) and ethylene glycol (EG). This process not only recycles PET efficiently but also manages contaminants effectively, producing high-quality TPA, supporting the development of a circular economy. This study looks into PET depolymerization via alkaline hydrolysis at low temperature by investigating effects of various factors: pH levels, water to ethanol ratio, NaOH concentration, NaOH to PET ratio, reaction time, PET size, reusability of unreacted PET, air plasma pretreatment of PET, and different kinds of PET. Promisingly, PET conversion rates of over 90% and a TPA purity of 99.6% were achieved in this study highlighting the efficacy of alkaline hydrolysis in depolymerizing post-consumer PET waste. Ultimately, this research advances sustainable plastic waste management and supports the integration of PET into a circular economy framework.
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Affiliation(s)
- Sosiawati Teke
- Department of Chemical Engineering, Jeju National University, Jeju, 63243, Republic of Korea; Department of Physics, Halu Oleo University, Kendari, 931332, Indonesia
| | - Shirjana Saud
- Department of Chemical Engineering, Jeju National University, Jeju, 63243, Republic of Korea; Institute of Theoretical and Applied Research, Duy Tan University, Hanoi, 100000, Viet Nam; Institute of Research and Development, Duy Tan University, Danang, 550000, Viet Nam.
| | - Roshan Mangal Bhattarai
- Department of Chemical Engineering, Jeju National University, Jeju, 63243, Republic of Korea
| | - Adnan Ali
- Department of Chemical Engineering, Jeju National University, Jeju, 63243, Republic of Korea
| | - Lan Nguyen
- Department of Chemical Engineering, Jeju National University, Jeju, 63243, Republic of Korea
| | - Avik Denra
- Department of Chemical Engineering, Jeju National University, Jeju, 63243, Republic of Korea
| | - Duc Ba Nguyen
- Institute of Theoretical and Applied Research, Duy Tan University, Hanoi, 100000, Viet Nam; Institute of Research and Development, Duy Tan University, Danang, 550000, Viet Nam
| | - Young Sun Mok
- Department of Chemical Engineering, Jeju National University, Jeju, 63243, Republic of Korea.
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2
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Zhou Y, Zheng F, Zuo J, Xu Y, Li Y, Zhang K. Toward a Sustainable Approach for Durably Hydrophilic and UV Protective PET Fabric through Surface Activation and Immobilization Integrating Epigallocatechin Gallate and Citric Acid. ACS APPLIED MATERIALS & INTERFACES 2024; 16:38576-38585. [PMID: 38986140 DOI: 10.1021/acsami.4c07898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/12/2024]
Abstract
Enhancing the hydrophilicity and UV protective property of poly(ethylene terephthalate) (PET) fabric are two significant ways to upgrade its quality and enlarge the applicable area. Biobased finishes are greatly welcomed for the fabrication of sustainable textiles; however, their application on PET fabric is still challenging compared with the case of natural fabric. This study presents a strategy that immobilizes epigallocatechin gallate (EGCG) onto PET fabric using citric acid (CA) for durably hydrophilic and UV-proof properties with negligible color change. A controllable surface-activating method integrating alkaline and deep eutectic solvent (DES) is customized for the PET fabric to promote the reactions among PET, CA, and EGCG. The hydrophilic, antistatic, and UV protective properties of functionalized PET fabric were explored. Results show that the hydrophilicity of the PET fabric after direct EGCG treatment increases but drops sharply after first-round washing due to weak interactions. The combined alkaline/DES pretreatment increases the number of hydrophilic groups and the roughness of PET fibers. After EGCG modification, the moisture regain (MR) of PET fabric increases from 0.41 to 0.64%. The contact angle and electrostatic charge half-life (T1/2) decreases from >120 to 23°, and from >60 to 0.13 s, respectively. The MR and T1/2 are well retained after a 10-cycle washing. In addition, the UV protective factor of the PET fabric increases from 18 to 36. A very slight yellowing phenomenon occurs on the PET fabric after the treatment. In all, this research attempts to integrate a biobased finishing agent and an eco-friendly cross-linker on synthetic fiber for durable functions, which is transferrable to the sustainable fabrication of other polymeric materials such as fibers or films.
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Affiliation(s)
- Yuyang Zhou
- National Engineering Laboratory for Modern Silk, China National Textile and Apparel Council Key Laboratory of Natural Dyes, College of Textile and Clothing Engineering, Soochow University, Ren'ai Road, Suzhou 215123, China
- PPM Institute of Functional Materials, Poly Plastic Masterbatch (Suzhou) Co., Ltd., Xujiaguan Road, Beiqiao Street, Xiangcheng, Suzhou 215144, China
| | - Feiyang Zheng
- National Engineering Laboratory for Modern Silk, China National Textile and Apparel Council Key Laboratory of Natural Dyes, College of Textile and Clothing Engineering, Soochow University, Ren'ai Road, Suzhou 215123, China
| | - Jiahong Zuo
- National Engineering Laboratory for Modern Silk, China National Textile and Apparel Council Key Laboratory of Natural Dyes, College of Textile and Clothing Engineering, Soochow University, Ren'ai Road, Suzhou 215123, China
| | - Yiming Xu
- PPM Institute of Functional Materials, Poly Plastic Masterbatch (Suzhou) Co., Ltd., Xujiaguan Road, Beiqiao Street, Xiangcheng, Suzhou 215144, China
| | - Yening Li
- PPM Institute of Functional Materials, Poly Plastic Masterbatch (Suzhou) Co., Ltd., Xujiaguan Road, Beiqiao Street, Xiangcheng, Suzhou 215144, China
| | - Keqin Zhang
- National Engineering Laboratory for Modern Silk, China National Textile and Apparel Council Key Laboratory of Natural Dyes, College of Textile and Clothing Engineering, Soochow University, Ren'ai Road, Suzhou 215123, China
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3
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Baluk MA, Trzebiatowska PJ, Pieczyńska A, Makowski D, Kroczewska M, Łuczak J, Zaleska-Medynska A. A new strategy for PET depolymerization: Application of bimetallic MOF-74 as a selective catalyst. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 363:121360. [PMID: 38850902 DOI: 10.1016/j.jenvman.2024.121360] [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: 01/04/2024] [Revised: 04/24/2024] [Accepted: 05/31/2024] [Indexed: 06/10/2024]
Abstract
Large-volume production of poly(ethylene terephthalate) (PET), especially in the form of bottles and food packaging containers, causes problems with polymer waste management. Waste PET could be recycled thermally, mechanically or chemically and the last method allows to obtain individual monomers, but most often it is carried out in the presence of homogeneous catalysts, that are difficult to separate and reuse. In view of this, this work reports for the first time, application of bimetallic MOF-74 - as heterogeneous catalyst - for depolymerization of PET with high monomer (bishydroxyethyl terephthalate, BHET) recovery. The effect of type and amount of second metal in the MOF-74 (Mg/M) was systematically investigated. The results showed increased activity of MOF-74 (Mg/M) containing Co2+, Zn2+ and Mn2+ as a second metal, while the opposite correlation was observed for Cu2+ and Ni2+. It was found that the highest catalytic activity was demonstrated by the introduction of Mg-Mn into MOF-74 with ratio molar 1:1, which resulted in complete depolymerization of PET and 91.8% BHET yield within 4 h. Furthermore, the obtained catalyst showed good stability in 5 reaction cycles and allowed to achieve high-purity BHET, which was confirmed by HPLC analysis. The as-prepared MOF-74 (Mg/Mn) was easy to separate from the post-reaction mixture, clean and reuse in the next depolymerization reaction.
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Affiliation(s)
- Mateusz Adam Baluk
- Department of Environmental Technology, Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdansk, Poland.
| | | | - Aleksandra Pieczyńska
- Department of Environmental Technology, Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdansk, Poland
| | - Damian Makowski
- Department of Environmental Technology, Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdansk, Poland
| | - Malwina Kroczewska
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12, 80-233, Gdańsk, Poland
| | - Justyna Łuczak
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12, 80-233, Gdańsk, Poland; Advanced Materials Center, Gdańsk University of Technology, Narutowicza 11/12, 80-233, Gdańsk, Poland
| | - Adriana Zaleska-Medynska
- Department of Environmental Technology, Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdansk, Poland.
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4
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Enache AC, Grecu I, Samoila P. Polyethylene Terephthalate (PET) Recycled by Catalytic Glycolysis: A Bridge toward Circular Economy Principles. MATERIALS (BASEL, SWITZERLAND) 2024; 17:2991. [PMID: 38930360 PMCID: PMC11205646 DOI: 10.3390/ma17122991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2024] [Revised: 06/13/2024] [Accepted: 06/14/2024] [Indexed: 06/28/2024]
Abstract
Plastic pollution has escalated into a critical global issue, with production soaring from 2 million metric tons in 1950 to 400.3 million metric tons in 2022. The packaging industry alone accounts for nearly 44% of this production, predominantly utilizing polyethylene terephthalate (PET). Alarmingly, over 90% of the approximately 1 million PET bottles sold every minute end up in landfills or oceans, where they can persist for centuries. This highlights the urgent need for sustainable management and recycling solutions to mitigate the environmental impact of PET waste. To better understand PET's behavior and promote its management within a circular economy, we examined its chemical and physical properties, current strategies in the circular economy, and the most effective recycling methods available today. Advancing PET management within a circular economy framework by closing industrial loops has demonstrated benefits such as reduced landfill waste, minimized energy consumption, and conserved raw resources. To this end, we identified and examined various strategies based on R-imperatives (ranging from 3R to 10R), focusing on the latest approaches aimed at significantly reducing PET waste by 2040. Additionally, a comparison of PET recycling methods (including primary, secondary, tertiary, and quaternary recycling, along with the concepts of "zero-order" and biological recycling techniques) was envisaged. Particular attention was paid to the heterogeneous catalytic glycolysis, which stands out for its rapid reaction time (20-60 min), high monomer yields (>90%), ease of catalyst recovery and reuse, lower costs, and enhanced durability. Accordingly, the use of highly efficient oxide-based catalysts for PET glycolytic degradation is underscored as a promising solution for large-scale industrial applications.
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Affiliation(s)
| | | | - Petrisor Samoila
- “Petru Poni” Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania; (A.-C.E.); (I.G.)
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Li T, Theodosopoulos G, Lovell C, Loukodimou A, Maniam KK, Paul S. Progress in Solvent-Based Recycling of Polymers from Multilayer Packaging. Polymers (Basel) 2024; 16:1670. [PMID: 38932020 PMCID: PMC11207984 DOI: 10.3390/polym16121670] [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: 04/30/2024] [Revised: 06/03/2024] [Accepted: 06/06/2024] [Indexed: 06/28/2024] Open
Abstract
Conversion of chemical feedstocks derived from fossil fuels to virgin polymer, manufacturing of plastics in coal-dependent economies, and increasing consumption of virgin polymers for plastics packaging contribute significantly to environmental issues and the challenges we face. Nowadays, promoting sustainable development has become the consensus of more and more countries. Among them, the recycling of multilayer packaging is a huge challenge. Due to the complexity of its structure and materials, as well as the limitations of existing recycling frameworks, currently, multilayer packaging cannot be commercially recycled thus resulting in a series of circular economy challenges. It is undeniable that multilayer packaging offers many positive effects on products and consumers, so banning the use of such packaging would be unwise and unrealistic. Developing the appropriate processes to recycle multilayer packaging is the most feasible strategy. In recent years, there have been some studies devoted to the recycling process of multilayer packaging. Many of the processes being developed involve the use of solvents. Based on the recycled products, we categorised these recycling processes as solvent-based recycling, including physical dissolution and chemical depolymerisation. In physical dissolution, there are mainly two approaches named delamination and selective dissolution-precipitation. Focusing on these processes, this paper reviews the solvents developed and used in the last 20 years for the recycling of polymers from multilayer packaging waste and gives a summary of their advantages and disadvantages in terms of cost, product quality, ease of processing, and environmental impact. Based on existing research, one could conclude that solvent-based recycling methods have the potential to be commercialised and become part of a standard recycling process for polymer-based multilayer packaging. The combined use of multiple solvent-based recycling processes could be a breakthrough in achieving unified recycling of multilayer packaging with different components.
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Affiliation(s)
- Tianmiao Li
- Materials Innovation Centre, School of Engineering, University of Leicester, Leicester LE1 7RH, UK; (T.L.); (A.L.)
| | - George Theodosopoulos
- Materials Performance and Integrity Technology Group, TWI Ltd., Cambridge CB21 6AL, UK; (G.T.); (K.K.M.)
| | - Chris Lovell
- Materials Performance and Integrity Technology Group, TWI Technology and Training Centre-North East, Middlesbrough TS2 1DJ, UK;
| | - Adamantini Loukodimou
- Materials Innovation Centre, School of Engineering, University of Leicester, Leicester LE1 7RH, UK; (T.L.); (A.L.)
| | - Kranthi Kumar Maniam
- Materials Performance and Integrity Technology Group, TWI Ltd., Cambridge CB21 6AL, UK; (G.T.); (K.K.M.)
| | - Shiladitya Paul
- Materials Innovation Centre, School of Engineering, University of Leicester, Leicester LE1 7RH, UK; (T.L.); (A.L.)
- Materials Performance and Integrity Technology Group, TWI Ltd., Cambridge CB21 6AL, UK; (G.T.); (K.K.M.)
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6
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Ren T, Zhan H, Xu H, Chen L, Shen W, Xu Y, Zhao D, Shao Y, Wang Y. Recycling and high-value utilization of polyethylene terephthalate wastes: A review. ENVIRONMENTAL RESEARCH 2024; 249:118428. [PMID: 38325788 DOI: 10.1016/j.envres.2024.118428] [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: 10/11/2023] [Revised: 01/31/2024] [Accepted: 02/04/2024] [Indexed: 02/09/2024]
Abstract
Polyethelene terephthalate (PET) is a well-known thermoplastic, and recycling PET waste is important for the natural environment and human health. This study provides a comprehensive overview of the recycling and reuse of PET waste through energy recovery and physical, chemical, and biological recycling. This article summarizes the recycling methods and the high-value products derived from PET waste, specifically detailing the research progress on regenerated PET prepared by the mechanical recycling of fiber/yarn, fabric, and composite materials, and introduces the application of PET nanofibers recycled by physical dissolution and electrospinning in fields such as filtration, adsorption, electronics, and antibacterial materials. This article explains the energy recovery of PET through thermal decomposition and comprehensively discusses various chemical recycling methods, including the reaction mechanisms, catalysts, conversion efficiencies, and reaction products, with a brief introduction to PET biodegradation using hydrolytic enzymes provided. The analysis and comparison of various recycling methods indicated that the mechanical recycling method yielded PET products with a wide range of applications in composite materials. Electrospinning is a highly promising recycling strategy for fabricating recycled PET nanofibers. Compared to other methods, physical recycling has advantages such as low cost, low energy consumption, high value, simple processing, and environmental friendliness, making it the preferred choice for the recycling and high-value utilization of waste PET.
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Affiliation(s)
- Tianxiang Ren
- Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Zhejiang Sub-center of National Carbon Fiber Engineering Technology Research Center, Shaoxing Sub-center of National Engineering Research Center for Fiber-based Composites, Shaoxing Key Laboratory of High Performance fibers & products, College of Textile and Garment, Shaoxing University, Shaoxing, 312000, China
| | - Haihua Zhan
- Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Zhejiang Sub-center of National Carbon Fiber Engineering Technology Research Center, Shaoxing Sub-center of National Engineering Research Center for Fiber-based Composites, Shaoxing Key Laboratory of High Performance fibers & products, College of Textile and Garment, Shaoxing University, Shaoxing, 312000, China
| | - Huaizhong Xu
- Department of Biobased Materials Science, Kyoto Institute of Technology, Matsugasaki, Sakyo-Ku, Kyoto, 606-8585, Japan
| | - Lifeng Chen
- Shaoxing Baojing Composite Materials Co., Ltd., Shaoxing, 312000, China
| | - Wei Shen
- Shaoxing Baojing Composite Materials Co., Ltd., Shaoxing, 312000, China
| | - Yudong Xu
- Zhejiang Provincial Innovation Center of Advanced Textile Technology, Shaoxing, 312000, China
| | - Defang Zhao
- Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Zhejiang Sub-center of National Carbon Fiber Engineering Technology Research Center, Shaoxing Sub-center of National Engineering Research Center for Fiber-based Composites, Shaoxing Key Laboratory of High Performance fibers & products, College of Textile and Garment, Shaoxing University, Shaoxing, 312000, China; School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310058, China; Hailiang Group Co., Ltd., Hangzhou, 310000, China.
| | - Yuanyi Shao
- College of Textiles, Donghua University, Shanghai, 201620, China.
| | - Yongtao Wang
- School of Medicine, Shanghai University, Shanghai, 200444, China.
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7
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Shi C, Quinn EC, Diment WT, Chen EYX. Recyclable and (Bio)degradable Polyesters in a Circular Plastics Economy. Chem Rev 2024; 124:4393-4478. [PMID: 38518259 DOI: 10.1021/acs.chemrev.3c00848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/24/2024]
Abstract
Polyesters carrying polar main-chain ester linkages exhibit distinct material properties for diverse applications and thus play an important role in today's plastics economy. It is anticipated that they will play an even greater role in tomorrow's circular plastics economy that focuses on sustainability, thanks to the abundant availability of their biosourced building blocks and the presence of the main-chain ester bonds that can be chemically or biologically cleaved on demand by multiple methods and thus bring about more desired end-of-life plastic waste management options. Because of this potential and promise, there have been intense research activities directed at addressing recycling, upcycling or biodegradation of existing legacy polyesters, designing their biorenewable alternatives, and redesigning future polyesters with intrinsic chemical recyclability and tailored performance that can rival today's commodity plastics that are either petroleum based and/or hard to recycle. This review captures these exciting recent developments and outlines future challenges and opportunities. Case studies on the legacy polyesters, poly(lactic acid), poly(3-hydroxyalkanoate)s, poly(ethylene terephthalate), poly(butylene succinate), and poly(butylene-adipate terephthalate), are presented, and emerging chemically recyclable polyesters are comprehensively reviewed.
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Affiliation(s)
- Changxia Shi
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Ethan C Quinn
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Wilfred T Diment
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Eugene Y-X Chen
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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Manjunathan J, Pavithra K, Nangan S, Prakash S, Saxena KK, Sharma K, Muzammil K, Verma D, Gnanapragasam JR, Ramasubburayan R, Revathi M. Polyethylene terephthalate waste derived nanomaterials (WDNMs) and its utilization in electrochemical devices. CHEMOSPHERE 2024; 353:141541. [PMID: 38423149 DOI: 10.1016/j.chemosphere.2024.141541] [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: 08/16/2023] [Revised: 01/01/2024] [Accepted: 02/23/2024] [Indexed: 03/02/2024]
Abstract
Plastics are a vital component of our daily lives in the contemporary globalization period; they are present in all facets of modern life. Because the bulk of synthetic plastics utilized in the market are non-biodegradable by nature, the issues associated with their contamination are unavoidable in an era dominated by polymers. Polyethylene terephthalate (PET), which is extensively used in industries such as automotive, packaging, textile, food, and beverages production represents a major share of these non-biodegradable polymer productions. Given its extensive application across various sectors, PET usage results in a considerable amount of post-consumer waste, majority of which require disposal after a certain period. However, the recycling of polymeric waste materials has emerged as a prominent topic in research, driven by growing environmental consciousness. Numerous studies indicate that products derived from polymeric waste can be converted into a new polymeric resource in diverse sectors, including organic coatings and regenerative medicine. This review aims to consolidate significant scientific literatures on the recycling PET waste for electrochemical device applications. It also highlights the current challenges in scaling up these processes for industrial application.
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Affiliation(s)
- J Manjunathan
- Department of Biotechnology, Vels Institute of Science Technology and Advanced Studies, Pallavaram, Chennai, 600117, India
| | - K Pavithra
- Department of Chemistry, School of Basic Sciences, Vels Institute of Science Technology and Advanced Studies, Pallavaram, Chennai, 600 117, Tamilnadu, India
| | - Senthilkumar Nangan
- Department of Chemistry, Graphic Era Deemed to be University, Dehradun, Uttarkhand, India; Chitkara Centre for Research and Development, Chitkara University, Himachal Pradesh, 174103, India
| | - S Prakash
- Department of Basic Sciences, Institute of Fisheries Post Graduate Studies, Tamilnadu Dr. J. Jayalalithaa Fisheries University, OMR Campus, Chennai, Tamilnadu, India
| | - Kuldeep K Saxena
- Division of Research and Development, Lovely Professional University, Phagwara, Punjab, India
| | - Kuldeep Sharma
- Centre for Research Impact and Outcomes, Chitkara University, Rajpura, Punjab, India
| | - Khursheed Muzammil
- Department of Public Health, College of Applied Medical Sciences, Khamis Mushait Campus, King Khalid University, Abha, 62561, Saudi Arabia
| | - Deepak Verma
- Department of Mechanical Engineering, Graphic Era Hill University, Dehradun, Uttarkhand, India
| | | | - R Ramasubburayan
- Centre for Marine Research and Conservation, Department of Prosthodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, 600 077, Tamilnadu, India.
| | - M Revathi
- Department of Chemistry, School of Basic Sciences, Vels Institute of Science Technology and Advanced Studies, Pallavaram, Chennai, 600 117, Tamilnadu, India.
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9
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Zhang R, Zheng X, Cheng X, Xu J, Li Y, Zhou Q, Xin J, Yan D, Lu X. Degradation of Poly(ethylene terephthalate) Catalyzed by Nonmetallic Dibasic Ionic Liquids under UV Radiation. MATERIALS (BASEL, SWITZERLAND) 2024; 17:1583. [PMID: 38612097 PMCID: PMC11012343 DOI: 10.3390/ma17071583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 03/22/2024] [Accepted: 03/26/2024] [Indexed: 04/14/2024]
Abstract
Nonmetallic ionic liquids (ILs) exhibit unique advantages in catalyzing poly (ethylene terephthalate) (PET) glycolysis, but usually require longer reaction times. We found that exposure to UV radiation can accelerate the glycolysis reaction and significantly reduce the reaction time. In this work, we synthesized five nonmetallic dibasic ILs, and their glycolysis catalytic activity was investigated. 1,8-diazabicyclo [5,4,0] undec-7-ene imidazole ([HDBU]Im) exhibited better catalytic performance. Meanwhile, UV radiation is used as a reinforcement method to improve the PET glycolysis efficiency. Under optimal conditions (5 g PET, 20 g ethylene glycol (EG), 0.25 g [HDBU]Im, 10,000 µW·cm-2 UV radiation reacted for 90 min at 185 °C), the PET conversion and BHET yield were 100% and 88.9%, respectively. Based on the UV-visible spectrum, it was found that UV radiation can activate the C=O in PET. Hence, the incorporation of UV radiation can considerably diminish the activation energy of the reaction, shortening the reaction time of PET degradation. Finally, a possible reaction mechanism of [HDBU]Im-catalyzed PET glycolysis under UV radiation was proposed.
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Affiliation(s)
- Ruiqi Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; (R.Z.); (J.X.)
- School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xu Zheng
- College of Chemistry, Liaoning University, Shenyang 110036, China
| | - Xiujie Cheng
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; (R.Z.); (J.X.)
- School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Junli Xu
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; (R.Z.); (J.X.)
- School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yi Li
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; (R.Z.); (J.X.)
- School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qing Zhou
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; (R.Z.); (J.X.)
- School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jiayu Xin
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; (R.Z.); (J.X.)
- School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Dongxia Yan
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; (R.Z.); (J.X.)
- School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xingmei Lu
- Beijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; (R.Z.); (J.X.)
- School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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10
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Moussa K, Awad S, Krawczak P, Al Takash A, Faraj J, Khaled M. An Overview of the Non-Energetic Valorization Possibilities of Plastic Waste via Thermochemical Processes. MATERIALS (BASEL, SWITZERLAND) 2024; 17:1460. [PMID: 38611975 PMCID: PMC11012670 DOI: 10.3390/ma17071460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Revised: 03/11/2024] [Accepted: 03/15/2024] [Indexed: 04/14/2024]
Abstract
The recovery and recycling/upcycling of plastics and polymer-based materials is needed in order to reduce plastic waste accumulated over decades. Mechanical recycling processes have made a great contribution to the circularity of plastic materials, contributing to 99% of recycled thermoplastics. Challenges facing this family of processes limit its outreach to 30% of plastic waste. Complementary pathways are needed to increase recycling rates. Chemical processes have the advantage of decomposing plastics into a variety of hydrocarbons that can cover a wide range of applications, such as monomers, lubricants, phase change materials, solvents, BTX (benzene, toluene, xylene), etc. The aim of the present work is to shed light on different chemical recycling pathways, with a special focus on thermochemicals. The study will cover the effects of feedstock, operating conditions, and processes used on the final products. Then, it will attempt to correlate these final products to some petrochemical feedstock being used today on a large scale.
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Affiliation(s)
- Kazem Moussa
- Energy and Thermo-Fluid Group, Lebanese International University, LIU, Bekaa P.O. Box 146404, Lebanon; (K.M.); (A.A.T.); (J.F.); (M.K.)
| | - Sary Awad
- IMT Atlantique, GEPEA, UMR CNRS 6144, 4 Rue Alfred Kastler, F-44000 Nantes, France
| | - Patricia Krawczak
- IMT Nord Europe, Institut Mines-Télécom, University of Lille, Centre for Materials and Processes, 941 rue Charles Bourseul, CS 10838, F-59508 Douai, France;
| | - Ahmad Al Takash
- Energy and Thermo-Fluid Group, Lebanese International University, LIU, Bekaa P.O. Box 146404, Lebanon; (K.M.); (A.A.T.); (J.F.); (M.K.)
- Energy and Thermo-Fluid Group, The International University of Beirut BIU, Beirut P.O. Box 146404, Lebanon
| | - Jalal Faraj
- Energy and Thermo-Fluid Group, Lebanese International University, LIU, Bekaa P.O. Box 146404, Lebanon; (K.M.); (A.A.T.); (J.F.); (M.K.)
- Energy and Thermo-Fluid Group, The International University of Beirut BIU, Beirut P.O. Box 146404, Lebanon
| | - Mahmoud Khaled
- Energy and Thermo-Fluid Group, Lebanese International University, LIU, Bekaa P.O. Box 146404, Lebanon; (K.M.); (A.A.T.); (J.F.); (M.K.)
- Center for Sustainable Energy & Economic Development (SEED), Gulf University for Science & Technology, Hawally P.O. Box 7207, Kuwait
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11
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Kumar V, Sharma N, Umesh M, Sharma R, Sharma M, Sharma D, Sharma M, Sondhi S, Thomas J, Kumar D, Kansal L, Jha NK. Commercialization potential of PET (polyethylene terephthalate) recycled nanomaterials: A review on validation parameters. CHEMOSPHERE 2024; 352:141453. [PMID: 38364916 DOI: 10.1016/j.chemosphere.2024.141453] [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: 08/18/2023] [Revised: 01/10/2024] [Accepted: 02/10/2024] [Indexed: 02/18/2024]
Abstract
Polyethylene Terephthalate (PET) is a polymer which is considered as one of the major contaminants to the environment. The PET waste materials can be recycled to produce value-added products. PET can be converted to nanoparticles, nanofibers, nanocomposites, and nano coatings. To extend the applications of PET nanomaterials, understanding its commercialization potential is important. In addition, knowledge about the factors affecting recycling of PET based nanomaterials is essential. The presented review is focused on understanding the PET commercialization aspects, keeping in mind market analysis, growth drivers, regulatory affairs, safety considerations, issues associated with scale-up, manufacturing challenges, economic viability, and cost-effectiveness. In addition, the paper elaborates the challenges associated with the use of PET based nanomaterials. These challenges include PET contamination to water, soil, sediments, and human exposure to PET nanomaterials. Moreover, the paper discusses in detail about the factors affecting PET recycling, commercialization, and circular economy with specific emphasis on life cycle assessment (LCA) of PET recycled nanomaterials.
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Affiliation(s)
- Vinay Kumar
- Bioconversion and Tissue Engineering (BITE) Laboratory, Department of Community Medicine, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai, Thandalam, 602105, India
| | - Neha Sharma
- Department of Biochemistry, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai, Thandalam, 602105, India
| | - Mridul Umesh
- Department of Life Sciences, CHRIST (Deemed to be University), Bangalore, 560029, Karnataka, India.
| | - Roopali Sharma
- Department of Biotechnology, Chandigarh College of Technology, Chandigarh Group of Colleges, Landran, Mohali, 140307, Punjab, India
| | - Munish Sharma
- Department of Plant Sciences, Central University of Himachal Pradesh, Shahpur Campus, 176206, Kangra, Himachal Pradesh, India
| | - Deepak Sharma
- Department of Biotechnology, Chandigarh College of Technology, Chandigarh Group of Colleges, Landran, Mohali, 140307, Punjab, India
| | - Munish Sharma
- Department of Plant Sciences, Central University of Himachal Pradesh, Shahpur Campus, 176206, Kangra, Himachal Pradesh, India
| | - Sonica Sondhi
- Haryana State Pollution Control Board, C-11, Panchkula, Haryana, India
| | - Jithin Thomas
- Department of Biotechnology, Mar Athanasius College, Kerala, India
| | - Deepak Kumar
- Department of Biotechnology-UIBT, Chandigarh University, Punjab, India
| | - Lavish Kansal
- School of Electronics and Electrical Engineering, Lovely Professional University, Phagwara, India
| | - Niraj Kumar Jha
- Centre for Global Health Research, Saveetha Medical College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India; Centre for Research Impact and Outcomes, Chitkara University, Rajpura, Punjab, India; Department of Biotechnology, School of Applied & Life Sciences (SALS), Uttaranchal University, Dehradun, 248007, India
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12
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Muszyński M, Nowicki J, Zygadło M, Dudek G. Comparsion of Catalyst Effectiveness in Different Chemical Depolymerization Methods of Poly(ethylene terephthalate). Molecules 2023; 28:6385. [PMID: 37687213 PMCID: PMC10489063 DOI: 10.3390/molecules28176385] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 08/28/2023] [Accepted: 08/29/2023] [Indexed: 09/10/2023] Open
Abstract
This paper presents an overview of the chemical recycling methods of polyethylene terephthalate (PET) described in the scientific literature in recent years. The review focused on methods of chemical recycling of PET including hydrolysis and broadly understood alcoholysis of polymer ester bonds including methanolysis, ethanolysis, glycolysis and reactions with higher alcohols. The depolymerization methods used in the literature are described, with particular emphasis on the use of homogeneous and heterogeneous catalysts and ionic liquids, as well as auxiliary substances such as solvents and cosolvents. Important process parameters such as temperature, reaction time, and pressure are compared. Detailed experimental results are presented focusing on reaction yields to allow for easy comparison of applied catalysts and for determination of the most favorable reaction conditions and methods.
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Affiliation(s)
- Marcin Muszyński
- Łukasiewicz Research Network, Institute of Heavy Organic Synthesis “Blachownia”, Energetyków 9, 47-225 Kędzierzyn-Koźle, Poland; (M.M.); (J.N.)
- Department of Physical Chemistry and Technology of Polymers, PhD School, Silesian University of Technology, ks. M. Strzody 9, 44-100 Gliwice, Poland
| | - Janusz Nowicki
- Łukasiewicz Research Network, Institute of Heavy Organic Synthesis “Blachownia”, Energetyków 9, 47-225 Kędzierzyn-Koźle, Poland; (M.M.); (J.N.)
| | - Mateusz Zygadło
- Department of Physical Chemistry and Technology of Polymers, Faculty of Chemistry, Silesian University of Technology, ks. M. Strzody 9, 44-100 Gliwice, Poland;
| | - Gabiela Dudek
- Department of Physical Chemistry and Technology of Polymers, Faculty of Chemistry, Silesian University of Technology, ks. M. Strzody 9, 44-100 Gliwice, Poland;
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13
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Lin Y, Yang D, Meng C, Si C, Zhang Q, Zeng G, Jiang W. Oxygen Vacancy Promoted Generation of Monatomic Oxygen Anion over Ni 2+ -Doped MgO for Efficient Glycolysis of Waste PET. CHEMSUSCHEM 2023; 16:e202300154. [PMID: 36862090 DOI: 10.1002/cssc.202300154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/28/2023] [Accepted: 03/01/2023] [Indexed: 05/06/2023]
Abstract
Developing efficient and eco-friendly catalysts for selective degradation of waste polyethylene terephthalate (PET) is critical to the circular economy of plastics. Herein, we report the first monatomic oxygen anion (O- )-rich MgO-Ni catalyst based on a combined theoretical and experimental approach, which achieves a bis(hydroxyethyl) terephthalate yield of 93.7 % with no heavy metal residues detected. DFT calculations and electron paramagnetic resonance characterization indicate that Ni2+ doping not only reduces the formation energy of oxygen vacancies, but also enhances local electron density to facilitate the conversion of adsorbed oxygen into O- . O- plays a crucial role in the deprotonation of ethylene glycol (EG) to EG- (exothermic by -0.6 eV with an activation barrier of 0.4 eV), which is proved effective to break the PET chain via nucleophilic attack on carbonyl carbon. This work reveals the potential of alkaline earth metal-based catalysts in efficient PET glycolysis.
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Affiliation(s)
- Yuheng Lin
- Department of Environmental Engineering and State Key Laboratory of Pollution Control and Resources Reuse, Nanjing University, Nanjing, 210023, P. R. China
| | - Deshuai Yang
- Kuang Yaming Honors School & Institute for Brain Sciences, Nanjing University, Nanjing, 210023, P. R. China
| | - Chaoyu Meng
- Department of Environmental Engineering and State Key Laboratory of Pollution Control and Resources Reuse, Nanjing University, Nanjing, 210023, P. R. China
| | - Chunying Si
- Department of Environmental Engineering and State Key Laboratory of Pollution Control and Resources Reuse, Nanjing University, Nanjing, 210023, P. R. China
| | - Quanxing Zhang
- Department of Environmental Engineering and State Key Laboratory of Pollution Control and Resources Reuse, Nanjing University, Nanjing, 210023, P. R. China
| | - Guixiang Zeng
- Kuang Yaming Honors School & Institute for Brain Sciences, Nanjing University, Nanjing, 210023, P. R. China
| | - Wei Jiang
- Department of Environmental Engineering and State Key Laboratory of Pollution Control and Resources Reuse, Nanjing University, Nanjing, 210023, P. R. China
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14
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Lee TH, Forrester M, Wang TP, Shen L, Liu H, Dileep D, Kuehl B, Li W, Kraus G, Cochran E. Dihydroxyterephthalate-A Trojan Horse PET Counit for Facile Chemical Recycling. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2210154. [PMID: 36857624 DOI: 10.1002/adma.202210154] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 02/04/2023] [Indexed: 05/26/2023]
Abstract
Here, low-energy poly(ethylene terephthalate) (PET) chemical recycling in water: PET copolymers with diethyl 2,5-dihydroxyterephthalate (DHTE) undergo selective hydrolysis at DHTE sites, autocatalyzed by neighboring group participation, is demonstrated. Liberated oligomeric subchains further hydrolyze until only small molecules remain. Poly(ethylene terephthalate-stat-2,5-dihydroxyterephthalate) copolymers were synthesized via melt polycondensation and then hydrolyzed in 150-200 °C water with 0-1 wt% ZnCl2 , or alternatively in simulated sea water. Degradation progress follows pseudo-first order kinetics. With increasing DHTE loading, the rate constant increases monotonically while the thermal activation barrier decreases. The depolymerization products are ethylene glycol, terephthalic acid, 2,5-dihydroxyterephthalic acid, and bis(2-hydroxyethyl) terephthalate dimer, which could be used to regenerate virgin polymer. Composition-optimized copolymers show a decrease of nearly 50% in the Arrhenius activation energy, suggesting a 6-order reduction in depolymerization time under ambient conditions compared to that of PET homopolymer. This study provides new insight to the design of polymers for end-of-life while maintaining key properties like service temperature and mechanical properties. Moreover, this chemical recycling procedure is more environmentally friendly compared to traditional approaches since water is the only needed material, which is green, sustainable, and cheap.
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Affiliation(s)
- Ting-Han Lee
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Michael Forrester
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Tung-Ping Wang
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Liyang Shen
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Hengzhou Liu
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Dhananjay Dileep
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Baker Kuehl
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Wenzhen Li
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
| | - George Kraus
- Department of Chemistry, Iowa State University, Ames, IA, 50011, USA
| | - Eric Cochran
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
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15
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Huang D, Zhang L, Sun Y. Rational Design of Disulfide Bridges in BbPETase CD for Enhancing the Enzymatic Performance in PET Degradation. Molecules 2023; 28:molecules28083528. [PMID: 37110762 PMCID: PMC10146679 DOI: 10.3390/molecules28083528] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 04/12/2023] [Accepted: 04/15/2023] [Indexed: 04/29/2023] Open
Abstract
Polyethylene terephthalate (PET) is one of the most prevalent transparent thermoplastics. It is commonly utilized due to its low cost and high durability. With the massive accumulation of waste PET, however, serious environmental pollution has become a global problem. Compared to traditional chemical degradation, biodegradation of PET catalyzed by PET hydrolase (PETase) is more environmentally friendly and energy-efficient. BbPETaseCD from the Burkholderiales bacterium is a PETase that shows favorable properties for application in the biodegradation of PET. To enhance the enzymatic performance of this enzyme, this work focuses on the rational design of disulfide bridges in BbPETaseCD. We utilized two computational algorithms to predict the probable disulfide-bridge mutations in BbPETaseCD, and five variants were acquired from the computations. Among these, the N364C/D418C variant with one additional disulfide bond showed higher expression than the wild-type enzyme (WT) and the best enzymatic performance. The melting temperature (Tm) of the N364C/D418C variant presented an increase of 14.8 °C over that of WT (56.5 °C), indicating that the additional disulfide bond significantly raised the thermodynamic stability of the enzyme. Kinetic experiments at different temperatures also demonstrated the thermal stability increase of the variant. The variant also showed significantly increased activity over WT when using bis(hydroxyethyl) terephthalate (BHET) as the substrate. More remarkably, the N364C/D418C variant exhibited approximately an 11-fold increase over the WT enzyme in the long-term (14 days) degradation of PET films. The results prove that the rationally designed disulfide bond significantly improved the enzymatic performance of the enzyme for PET degradation.
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Affiliation(s)
- Dongjian Huang
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
| | - Lin Zhang
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
- Key Laboratory of Systems Bioengineering and Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin University, Tianjin 300350, China
| | - Yan Sun
- Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
- Key Laboratory of Systems Bioengineering and Frontiers Science Center for Synthetic Biology (Ministry of Education), Tianjin University, Tianjin 300350, China
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16
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Bohre A, Jadhao PR, Tripathi K, Pant KK, Likozar B, Saha B. Chemical Recycling Processes of Waste Polyethylene Terephthalate Using Solid Catalysts. CHEMSUSCHEM 2023:e202300142. [PMID: 36972065 DOI: 10.1002/cssc.202300142] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/27/2023] [Accepted: 03/27/2023] [Indexed: 05/28/2023]
Abstract
Polyethylene terephthalate (PET) is a non-degradable single-use plastic and a major component of plastic waste in landfills. Chemical recycling is one of the most widely adopted methods to transform post-consumer PET into PET's building block chemicals. Non-catalytic depolymerization of PET is very slow and requires high temperatures and/or pressures. Recent advancements in the field of material science and catalysis have delivered several innovative strategies to promote PET depolymerization under mild reaction conditions. Particularly, heterogeneous catalysts assisted depolymerization of post-consumer PET to monomers and other value-added chemicals is the most industrially compatible method. This review includes current progresses on the heterogeneously catalyzed chemical recycling of PET. It describes four key pathways for PET depolymerization including, glycolysis, pyrolysis, alcoholysis, and reductive depolymerization. The catalyst function, active sites and structure-activity correlations are briefly outlined in each section. An outlook for future development is also presented.
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Affiliation(s)
- Ashish Bohre
- Department of Chemical Engineering, Indian Institute of Technology Delhi, Delhi, 110016, India
- Biomass and Energy Management Division, Sardar Swaran Singh National Institute of Bio-energy Kapurthala, Punjab, 1440603, India
- Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Hajdrihova 19, 1001, Ljubljana, Slovenia
| | - Prashant Ram Jadhao
- Department of Chemical Engineering, Indian Institute of Technology Delhi, Delhi, 110016, India
| | - Komal Tripathi
- Department of Chemical Engineering, Indian Institute of Technology Delhi, Delhi, 110016, India
| | - Kamal Kishore Pant
- Department of Chemical Engineering, Indian Institute of Technology Delhi, Delhi, 110016, India
| | - Blaž Likozar
- Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Hajdrihova 19, 1001, Ljubljana, Slovenia
| | - Basudeb Saha
- RiKarbon, Inc., 550 S. College Ave, Newark, Delaware, DE 19716, USA
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17
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Kulkarni A, Quintens G, Pitet LM. Trends in Polyester Upcycling for Diversifying a Problematic Waste Stream. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c02054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Affiliation(s)
- Amruta Kulkarni
- Advanced Functional Polymers (AFP) Laboratory, Institute for Materials Research (imo-imomec), Hasselt University, Martelarenlaan 42, 3500 Hasselt, Belgium
| | - Greg Quintens
- Advanced Functional Polymers (AFP) Laboratory, Institute for Materials Research (imo-imomec), Hasselt University, Martelarenlaan 42, 3500 Hasselt, Belgium
| | - Louis M. Pitet
- Advanced Functional Polymers (AFP) Laboratory, Institute for Materials Research (imo-imomec), Hasselt University, Martelarenlaan 42, 3500 Hasselt, Belgium
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18
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Shirazimoghaddam S, Amin I, Faria Albanese JA, Shiju NR. Chemical Recycling of Used PET by Glycolysis Using Niobia-Based Catalysts. ACS ENGINEERING AU 2023; 3:37-44. [PMID: 36820227 PMCID: PMC9936547 DOI: 10.1021/acsengineeringau.2c00029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 11/19/2022] [Accepted: 11/21/2022] [Indexed: 01/05/2023]
Abstract
Plastic production has steadily increased worldwide at a staggering pace. The polymer industry is, unfortunately, C-intensive, and accumulation of plastics in the environment has become a major issue. Plastic waste valorization into fresh monomers for production of virgin plastics can reduce both the consumption of fossil feedstocks and the environmental pollution, making the plastic economy more sustainable. Recently, the chemical recycling of plastics has been studied as an innovative solution to achieve a fully sustainable cycle. In this way, plastics are depolymerized to their monomers or/and oligomers appropriate for repolymerization, closing the loop. In this work, PET was depolymerized to its bis(2-hydroxyethyl) terephthalate (BHET) monomer via glycolysis, using ethylene glycol (EG) in the presence of niobia-based catalysts. Using a sulfated niobia catalyst treated at 573 K, we obtained 100% conversion of PET and 85% yield toward BHET at 195 °C in 220 min. This approach allows recycling of the PET at reasonable conditions using an inexpensive and nontoxic material as a catalyst.
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Affiliation(s)
- Shadi Shirazimoghaddam
- Van’t
Hoff Institute for Molecular Sciences, University of Amsterdam, 1090 GDAmsterdam, The Netherlands
| | - Ihsan Amin
- Van’t
Hoff Institute for Molecular Sciences, University of Amsterdam, 1090 GDAmsterdam, The Netherlands
| | - Jimmy A Faria Albanese
- Catalytic
Processes and Materials Group, Faculty of Science and Technology,
MESA+ Institute for Nanotechnology, University
of Twente, P.O. Box 217, 7500 AEAmsterdam, Netherlands
| | - N. Raveendran Shiju
- Van’t
Hoff Institute for Molecular Sciences, University of Amsterdam, 1090 GDAmsterdam, The Netherlands,
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19
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Bhanderi KK, Joshi JR, Patel JV. Recycling of polyethylene terephthalate (PET Or PETE) plastics – An alternative to obtain value added products: A review. J INDIAN CHEM SOC 2023. [DOI: 10.1016/j.jics.2022.100843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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20
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Study of polyester degradation by sub/supercritical ethanol and enhancement of carbon dioxide. J Supercrit Fluids 2023. [DOI: 10.1016/j.supflu.2023.105837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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21
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MILICHOVSKÝ FRANTIŠEK, MAJEROVÁ ADÉLA. WILL WE BE ABLE TO USE RECYCLED PLASTICS OR SHALL WE DECIDE FOR PACKAGING FREE PRODUKCTION? 12 2022. [DOI: 10.33543/1202276283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Recycled plastic and its use are imperative for preserving the environment, including proper plastic wash-out. Will we ever be able to push the Czech population and firms to use recycled material? Or is it happening spontaneously? A questionnaire created on Google Forms involves ten legislative and motivational questions comprising relevant data on the amount of plastic in municipal waste between 2010 and 2020 from the Czech Statistical Office. We found that the population understands the importance of using recycled material and recycled plastic without the government's impulse. Despite the high capital intensity, the state should impose taxes to protect the sustainable environment. We suggest a comprehensive and in-depth survey to acquire more accurate data.
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22
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Lee PS, Jung SM. Single‐catalyst
reactions from depolymerization to repolymerization: Transformation of polyethylene terephthalate to polyisocyanurate foam with deep eutectic solvents. J Appl Polym Sci 2022. [DOI: 10.1002/app.53205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Pyung Soo Lee
- Department of Chemical Engineering and Material Science Chung‐Ang University Seoul South Korea
- Department of Intelligent Energy and Industry Chung‐Ang University Seoul South Korea
| | - Simon MoonGeun Jung
- Green Carbon Research Center Korea Research Institute of Chemical Technology Daejeon South Korea
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23
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Wu S, Wu X, Li H, Li D, Zheng J, Lin Q, Nerín C, Zhong H, Dong B. The characterization and influence factors of semi-volatile compounds from mechanically recycled polyethylene terephthalate (rPET) by combining GC×GC-TOFMS and chemometrics. JOURNAL OF HAZARDOUS MATERIALS 2022; 439:129583. [PMID: 35872450 DOI: 10.1016/j.jhazmat.2022.129583] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 07/03/2022] [Accepted: 07/10/2022] [Indexed: 06/15/2023]
Abstract
A non-targeted method was developed for screening the semi-volatile compounds of different mechanically recycled PET intended for food contact materials. The data was further analyzed by multiple chemometrics methods to obtain the difference level, and the potential influence factors were investigated. The results showed that total dissolution with comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry was more effective than other reported methods. Based on the difference level, 97 compounds were characterized into 4 levels. 1-Methyl-2-pyrrolidinone originating from organic solvent was recognized as level IV and could be determined as the primary difference indicator. The contaminant is mainly attributed to the residuum derived from non-food consumer products. The specific types of contaminants and process parameters of the recycling, such as moisture content, properties of rPET, and temperature, were the potential key factors affecting the presence of semi-volatile compounds of mechanically recycled rPET.
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Affiliation(s)
- Siliang Wu
- National Reference Laboratory for Food Contact Material (Guangdong), Guangzhou Customs Technology Center, Guangzhou 510075, China
| | - Xuefeng Wu
- National Reference Laboratory for Food Contact Material (Guangdong), Guangzhou Customs Technology Center, Guangzhou 510075, China
| | - Hanke Li
- National Reference Laboratory for Food Contact Material (Guangdong), Guangzhou Customs Technology Center, Guangzhou 510075, China
| | - Dan Li
- National Reference Laboratory for Food Contact Material (Guangdong), Guangzhou Customs Technology Center, Guangzhou 510075, China
| | - Jianguo Zheng
- National Reference Laboratory for Food Contact Material (Guangdong), Guangzhou Customs Technology Center, Guangzhou 510075, China
| | - Qinbao Lin
- Key Laboratory of Product Packaging and Logistics, Packaging Engineering Institute, Jinan University, Zhuhai 519070, China
| | - Cristina Nerín
- Department of Analytical Chemistry, GUIA Group, I3A, EINA, University of Zaragoza, María de Luna 3, 50018 Zaragoza, Spain
| | - Huaining Zhong
- National Reference Laboratory for Food Contact Material (Guangdong), Guangzhou Customs Technology Center, Guangzhou 510075, China.
| | - Ben Dong
- National Reference Laboratory for Food Contact Material (Guangdong), Guangzhou Customs Technology Center, Guangzhou 510075, China.
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24
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Lee TH, Liu H, Forrester MJ, Shen L, Wang TP, Yu H, He JH, Li W, Kraus GA, Cochran EW. Next-Generation High-Performance Biobased Naphthalate-Modified PET for Sustainable Food Packaging Applications. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ting-Han Lee
- Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Hengzhou Liu
- Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Michael J. Forrester
- Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Liyang Shen
- Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Tung-ping Wang
- Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Huangchao Yu
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Jia-Hao He
- Department of Agricultural and Biosystems Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Wenzhen Li
- Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - George A. Kraus
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Eric W. Cochran
- Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States
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25
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Gupta NK, Reif P, Palenicek P, Rose M. Toward Renewable Amines: Recent Advances in the Catalytic Amination of Biomass-Derived Oxygenates. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Navneet Kumar Gupta
- Technical University of Darmstadt, Department of Chemistry, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
| | - Phillip Reif
- Technical University of Darmstadt, Department of Chemistry, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
| | - Phillip Palenicek
- Technical University of Darmstadt, Department of Chemistry, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
| | - Marcus Rose
- Technical University of Darmstadt, Department of Chemistry, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
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26
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Blanco-Gutiérrez V, Li P, Berzal-Cabetas R, Dos santos-García A. Exploring the photocatalytic activity of nanometric magnetite for PET materials degradation under UV light. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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27
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Ma M, Wang S, Liu Y, Yu H, Yu S, Ji C, Li H, Nie G, Liu S. Insights into the depolymerization of polyethylene terephthalate in methanol. J Appl Polym Sci 2022. [DOI: 10.1002/app.52814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Meiyuan Ma
- Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province, College of Chemical Engineering Qingdao University of Science and Technology Qingdao China
| | - Shuai Wang
- Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province, College of Chemical Engineering Qingdao University of Science and Technology Qingdao China
| | - Yue Liu
- Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province, College of Chemical Engineering Qingdao University of Science and Technology Qingdao China
| | - Hailong Yu
- Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province, College of Chemical Engineering Qingdao University of Science and Technology Qingdao China
| | - Shitao Yu
- Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province, College of Chemical Engineering Qingdao University of Science and Technology Qingdao China
| | - Congcong Ji
- Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province, College of Chemical Engineering Qingdao University of Science and Technology Qingdao China
| | - Haiyan Li
- Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province, College of Chemical Engineering Qingdao University of Science and Technology Qingdao China
| | - Genkuo Nie
- Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province, College of Chemical Engineering Qingdao University of Science and Technology Qingdao China
- Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education Qilu University of Technology (Shandong Academy of Sciences) Jinan China
| | - Shiwei Liu
- Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province, College of Chemical Engineering Qingdao University of Science and Technology Qingdao China
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28
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Karanastasis A, Safin V, Damodaran S, Pitet LM. Utility of Chemical Upcycling in Transforming Postconsumer PET to PBT-Based Thermoplastic Copolyesters Containing a Renewable Fatty-Acid-Derived Soft Block. ACS POLYMERS AU 2022; 2:351-360. [PMID: 36855581 PMCID: PMC9955273 DOI: 10.1021/acspolymersau.2c00019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thermoplastic copolyesters (TPCs) are important structural components in countless high performance applications that require excellent thermal stability and outstanding mechanical integrity. Segmented multiblock architectures are often employed for the most demanding applications, in which semicrystalline segments of poly(butylene terephthalate) (PBT) are combined with various low T g soft blocks. These segmented copolymers are nearly always synthesized from pristine feedstocks that are derived from fossil-fuel sources. In this work, we show a straightforward, one-pot synthetic approach to prepare TPCs starting from high-molar mass poly(ethylene terephthalate) recyclate (rPET) combined with a hydrophobic fatty acid dimer diol flexible segment. Transesterification is exploited to create a multiblock architecture. The high molar mass and segment distribution are elucidated by detailed size-exclusion chromatography and proton and carbon nuclear magnetic resonance spectroscopy. It is also shown that rPET can be chemically converted to PBT through a molecular exchange, in which the ethylene glycol is substituted by introducing 1,4-butane diol. A series of copolymers with various compositions was prepared with either PET or PBT segments and the final thermal properties and mechanical performance is compared between the two different constructs. Ultimately, PBT-based TPCs crystallize faster and exhibit a higher modulus over the range of explored compositions, making them ideal for applications that require injection molding. This represents an ideal, sustainable approach to making conventional TPCs, utilizing recyclate and biobased components to produce high performance polymer constructs via an easily accessible upcycling route.
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Affiliation(s)
- Apostolos
A. Karanastasis
- Advanced
Functional Polymers (AFP) Laboratory, Institute for Materials Research
(IMO), Hasselt University, Martelarenlaan 42, 3500 Hasselt, Belgium
| | - Victoria Safin
- Advanced
Functional Polymers (AFP) Laboratory, Institute for Materials Research
(IMO), Hasselt University, Martelarenlaan 42, 3500 Hasselt, Belgium
| | - Subin Damodaran
- Tosoh
Bioscience, GmbH, Im Leuschnerpark 4, 64347 Griesheim, Germany
| | - Louis M. Pitet
- Advanced
Functional Polymers (AFP) Laboratory, Institute for Materials Research
(IMO), Hasselt University, Martelarenlaan 42, 3500 Hasselt, Belgium,. Tel.: +32 11 26 83 20
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29
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Polyethylene Terephthalate (PET) Bottle-to-Bottle Recycling for the Beverage Industry: A Review. Polymers (Basel) 2022; 14:polym14122366. [PMID: 35745942 PMCID: PMC9231234 DOI: 10.3390/polym14122366] [Citation(s) in RCA: 57] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/01/2022] [Accepted: 06/07/2022] [Indexed: 12/10/2022] Open
Abstract
Disposal of plastic waste has become a widely discussed issue, due to the potential environmental impact of improper waste disposal. Polyethylene terephthalate (PET) packaging accounted for 44.7% of single-serve beverage packaging in the US in 2021, and 12% of global solid waste. A strategic solution is needed to manage plastic packaging solid waste. Major beverage manufacturers have pledged to reduce their environmental footprint by taking steps towards a sustainable future. The PET bottle has several properties that make it an environmentally friendly choice. The PET bottle has good barrier properties as its single-layer, mono-material composition allows it to be more easily recycled. Compared to glass, the PET bottle is lightweight and has a lower carbon footprint in production and transportation. With modern advancements to decontamination processes in the recycling of post-consumer recycled PET (rPET or PCR), it has become a safe material for reuse as beverage packaging. It has been 30 years since the FDA first began certifying PCR PET production processes as compliant for production of food contact PCR PET, for application within the United States. This article provides an overview of PET bottle-to-bottle recycling and guidance for beverage manufacturers looking to advance goals for sustainability.
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30
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Schirmeister CG, Mülhaupt R. Closing the Carbon Loop in the Circular Plastics Economy. Macromol Rapid Commun 2022; 43:e2200247. [PMID: 35635841 DOI: 10.1002/marc.202200247] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 05/07/2022] [Indexed: 11/06/2022]
Abstract
Today, plastics are ubiquitous in everyday life, problem solvers of modern technologies, and crucial for sustainable development. Yet the surge in global demand for plastics of the growing world population has triggered a tidal wave of plastic debris in the environment. Moving from a linear to a zero-waste and carbon-neutral circular plastic economy is vital for the future of the planet. Taming the plastic waste flood requires closing the carbon loop through plastic reuse, mechanical and molecular recycling, carbon capture, and use of the greenhouse gas carbon dioxide. In the quest for eco-friendly products, plastics do not need to be reinvented but tuned for reuse and recycling. Their full potential must be exploited regarding energy, resource, and eco efficiency, waste prevention, circular economy, climate change mitigation, and lowering environmental pollution. Biodegradation holds promise for composting and bio-feedstock recovery, but it is neither the Holy Grail of circular plastics economy nor a panacea for plastic littering. As an alternative to mechanical downcycling, molecular recycling enables both closed-loop recovery of virgin plastics and open-loop valorization, producing hydrogen, fuels, refinery feeds, lubricants, chemicals, and carbonaceous materials. Closing the carbon loop does not create a Perpetuum Mobile and requires renewable energy to achieve sustainability. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Carl G Schirmeister
- Freiburg Materials Research Center and Institute for Macromolecular Chemistry, University of Freiburg, Stefan-Meier-Str. 31, D-79104, Freiburg, Germany
| | - Rolf Mülhaupt
- Sustainability Center, University of Freiburg, Ecker-Str. 4, D-79104, Freiburg, Germany
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31
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Dios Caputto MD, Navarro R, Valentín JL, Marcos‐Fernández Á. Chemical upcycling of poly(ethylene terephthalate) waste: Moving to a circular model. JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1002/pol.20220137] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- María Dolores Dios Caputto
- Department of Physics of Polymers, Elastomers and Energy Applications Institute of Polymer Science and Technology (ICTP‐CSIC) Madrid Spain
| | - Rodrigo Navarro
- Department of Physics of Polymers, Elastomers and Energy Applications Institute of Polymer Science and Technology (ICTP‐CSIC) Madrid Spain
| | - Juan López Valentín
- Department of Physics of Polymers, Elastomers and Energy Applications Institute of Polymer Science and Technology (ICTP‐CSIC) Madrid Spain
| | - Ángel Marcos‐Fernández
- Department of Physics of Polymers, Elastomers and Energy Applications Institute of Polymer Science and Technology (ICTP‐CSIC) Madrid Spain
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32
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Morici E, Carroccio SC, Bruno E, Scarfato P, Filippone G, Dintcheva NT. Recycled (Bio)Plastics and (Bio)Plastic Composites: A Trade Opportunity in a Green Future. Polymers (Basel) 2022; 14:polym14102038. [PMID: 35631920 PMCID: PMC9148040 DOI: 10.3390/polym14102038] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 05/12/2022] [Accepted: 05/13/2022] [Indexed: 01/27/2023] Open
Abstract
Today’s world is at the point where almost everyone realizes the usefulness of going green. Due to so-called global warming, there is an urgent need to find solutions to help the Earth and move towards a green future. Many worldwide events are focusing on the global technologies in plastics, bioplastic production, the recycling industry, and waste management where the goal is to turn plastic waste into a trade opportunity among the industrialists and manufacturers. The present work aims to review the recycling process via analyzing the recycling of thermoplastic, thermoset polymers, biopolymers, and their complex composite systems, such as fiber-reinforced polymers and nanocomposites. Moreover, it will be highlighted how the frame of the waste management, increasing the materials specificity, cleanliness, and a low level of collected material contamination will increase the potential recycling of plastics and bioplastics-based materials. At the same time, to have a real and approachable trade opportunity in recycling, it needs to implement an integrated single market for secondary raw materials.
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Affiliation(s)
- Elisabetta Morici
- Advanced Technologies Network (ATeN) Center, Università di Palermo, Viale delle Scienze Ed. 18, 90128 Palermo, Italy
- Dipartimento di Ingegneria, Università di Palermo, Viale delle Scienze Ed. 6, 90128 Palermo, Italy
- Correspondence: (E.M.); (N.T.D.); Tel.: +39-0912-386-3704 (N.T.D.)
| | - Sabrina Carola Carroccio
- Consiglio Nazionale delle Ricerche, Institute of Polymers, Composites and Biomaterials (IPCB), Via P. Gaifami 18, 95126 Catania, Italy;
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi (IMM), Via Santa Sofia 64, 95123 Catania, Italy;
| | - Elena Bruno
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi (IMM), Via Santa Sofia 64, 95123 Catania, Italy;
- Dipartimento di Fisica e Astronomia “Ettore Majorana”, Università di Catania, 95123 Catania, Italy
| | - Paola Scarfato
- Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 84084 Fisciano, Italy;
| | - Giovanni Filippone
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, 80125 Naples, Italy;
| | - Nadka Tz. Dintcheva
- Dipartimento di Ingegneria, Università di Palermo, Viale delle Scienze Ed. 6, 90128 Palermo, Italy
- Correspondence: (E.M.); (N.T.D.); Tel.: +39-0912-386-3704 (N.T.D.)
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33
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Li X, Peng Y, Deng Y, Ye F, Zhang C, Hu X, Liu Y, Zhang D. Recycling and Reutilizing Polymer Waste via Electrospun Micro/Nanofibers: A Review. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:1663. [PMID: 35630885 PMCID: PMC9146546 DOI: 10.3390/nano12101663] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 04/30/2022] [Accepted: 05/07/2022] [Indexed: 02/06/2023]
Abstract
The accumulation of plastic waste resulting from the increasing demand for non-degradable plastics has led to a global environmental crisis. The severe environmental and economic drawbacks of inefficient, expensive, and impractical traditional waste disposal methods, such as landfills, incineration, plastic recycling, and energy production, limit the expansion of their applications to solving the plastic waste problem. Finding novel ways to manage the large amount of disposed plastic waste is urgent. Until now, one of the most valuable strategies for the handling of plastic waste has been to reutilize the waste as raw material for the preparation of functional and high-value products. Electrospun micro/nanofibers have drawn much attention in recent years due to their advantages of small diameter, large specific area, and excellent physicochemical features. Thus, electrospinning recycled plastic waste into micro/nanofibers creates diverse opportunities to deal with the environmental issue caused by the growing accumulation of plastic waste. This paper presents a review of recycling and reutilizing polymer waste via electrospinning. Firstly, the advantages of the electrospinning approach to recycling plastic waste are summarized. Then, the studies of electrospun recycled plastic waste are concluded. Finally, the challenges and future perspectives of electrospun recycled plastic waste are provided. In conclusion, this paper aims to provide a comprehensive overview of electrospun recycled plastic waste for researchers to develop further studies.
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Affiliation(s)
- Xiuhong Li
- School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China; (X.L.); (Y.P.); (Y.D.); (F.Y.); (D.Z.)
| | - Yujie Peng
- School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China; (X.L.); (Y.P.); (Y.D.); (F.Y.); (D.Z.)
| | - Yichen Deng
- School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China; (X.L.); (Y.P.); (Y.D.); (F.Y.); (D.Z.)
| | - Fangping Ye
- School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China; (X.L.); (Y.P.); (Y.D.); (F.Y.); (D.Z.)
| | - Chupeng Zhang
- School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China; (X.L.); (Y.P.); (Y.D.); (F.Y.); (D.Z.)
| | - Xinyu Hu
- School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China; (X.L.); (Y.P.); (Y.D.); (F.Y.); (D.Z.)
| | - Yong Liu
- Beijing Key Laboratory of Advanced Functional Polymer Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Daode Zhang
- School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China; (X.L.); (Y.P.); (Y.D.); (F.Y.); (D.Z.)
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34
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Lee PS, Jung SM. Flame retardancy of polyurethane foams prepared from green polyols with flame retardants. J Appl Polym Sci 2022. [DOI: 10.1002/app.52010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Pyung Soo Lee
- Department of Chemical Engineering and Material Science Chung‐Ang University Seoul South Korea
- Department of Intelligent Energy and Industry Chung‐Ang University Seoul South Korea
| | - Simon MoonGeun Jung
- Green Carbon Research Center Korea Research Institute of Chemical Technology Daejeon South Korea
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35
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36
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Kirshanov K, Toms R, Melnikov P, Gervald A. Unsaturated Polyester Resin Nanocomposites Based on Post-Consumer Polyethylene Terephthalate. Polymers (Basel) 2022; 14:polym14081602. [PMID: 35458352 PMCID: PMC9025439 DOI: 10.3390/polym14081602] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 04/09/2022] [Accepted: 04/12/2022] [Indexed: 12/10/2022] Open
Abstract
A method for producing nanocomposites of unsaturated polyester resins (UPR) based on recycled polyethylene terephthalate (PET) as a matrix has been proposed. The upcycling method involves three successive stages: (1) oligoesters synthesis, (2) simultaneous glycolysis and interchain exchange of oligoesters with PET, (3) interaction of the obtained resins with glycol and maleic anhydride. UPRs were characterized by FTIR spectroscopy and gel permeation chromatography. The mechanical properties of nanocomposites obtained on the basis of these resins and titanium dioxide have been investigated. It has been shown that 1,2-propylene glycol units, despite their lower reactivity, significantly improve the properties of UPR. The most promising nanocomposite sample exhibited tensile strength 112.62 MPa, elongation at break 157.94%, and Young's modulus 29.95 MPa. These results indicate that the proposed method made it possible to obtain nanocomposites with high mechanical properties based on recycled PET thus allowing one to create a valuable product from waste.
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37
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Wilson GT, Clark N, Hatton F, Trimingham R, Woolley E. Perpetual Plastic for Food to Go: A Design‐led Approach to Polymer Research. POLYM INT 2022. [DOI: 10.1002/pi.6401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Garrath T. Wilson
- Loughborough University UK, School of Design and Creative Arts Loughborough LE11 3TU
| | - Nikki Clark
- Loughborough University UK, School of Design and Creative Arts Loughborough LE11 3TU
| | - Fiona Hatton
- Loughborough University, UK, Department of Materials Loughborough LE11 3TU
| | - Rhoda Trimingham
- Loughborough University UK, School of Design and Creative Arts Loughborough LE11 3TU
| | - Elliot Woolley
- Loughborough University, UK School of Mechanical, Electrical and Manufacturing Engineering Loughborough LE11 3TU
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38
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Chu M, Liu Y, Lou X, Zhang Q, Chen J. Rational Design of Chemical Catalysis for Plastic Recycling. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01286] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Mingyu Chu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China
| | - Yu Liu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China
| | - Xiangxi Lou
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China
| | - Qiao Zhang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China
| | - Jinxing Chen
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China
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39
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Kirshanov K, Toms R, Melnikov P, Gervald A. Investigation of Polyester Tire Cord Glycolysis Accompanied by Rubber Crumb Devulcanization. Polymers (Basel) 2022; 14:684. [PMID: 35215597 PMCID: PMC8878447 DOI: 10.3390/polym14040684] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 02/04/2022] [Accepted: 02/08/2022] [Indexed: 11/29/2022] Open
Abstract
A new method for the recycling of a polyester tire cord under the action of oligoethylene terephthalates, bis(2-hydroxyethyl) terephthalate and ethylene glycol has been proposed. The method involves simultaneous homogeneous glycolysis of polyethylene terephthalate and devulcanization of crumb rubber. Polyester cord and glycolysates were characterized by FTIR spectroscopy and gel permeation chromatography (GPC). The devulcanization process was investigated by swelling-based methods. The rate of the proposed method of homogeneous glycolysis in a melt phase was proved to be higher than one of the heterogeneous glycolysis. The assumption of a more efficient devulcanization in the presence of a softener was also confirmed. The degree of devulcanization 46.07%, the apparent degree of swelling 167.4%, and the apparent swelling rate constant 0.0902 min-1 were achieved. The results indicate that the proposed method made it possible to carry out the glycolysis of the polyester cord of the tire more deeply than the known heterogeneous glycolysis with various agents, but further research is needed for industrial implementation.
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Affiliation(s)
| | | | - Pavel Melnikov
- M.V. Lomonosov Institute of Fine Chemical Technologies, MIREA—Russian Technological University, 119571 Moscow, Russia; (K.K.); (R.T.); (A.G.)
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40
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Circularity in Practice: Review of Main Current Approaches and Strategic Propositions for an Efficient Circular Economy of Materials. SUSTAINABILITY 2022. [DOI: 10.3390/su14020962] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
This paper aims to summarize, propose, and discuss existing or emerging strategies to shift towards a circular economy of materials. To clarify the landscape of existing circular practices, a new spectrum is proposed, from product-based strategies, where entire products go through several life cycles without being reprocessed, to material-based approaches, extracting, recycling, and reprocessing materials from the waste flow. As refillable packaging does not lose any functionality or value, when re-used through many life cycles, product-based strategies are globally extremely efficient and must be promoted. It appears however that their implementation is only possible at the scale of individual products such as packaging containers, relying on the cooperation of involved companies and consumers. It appears more and more urgent to focus as well on a more systematic and flexible material-oriented scheme. The example of circular glass recycling is a success in many countries, and technologies become nowadays available to extend such practices to many other materials, such as rigid plastics. An ideal would be to aim at an economy of materials that would imitate the continuous material cycle of the biosphere. Technological and business strategies are presented and discussed, aiming at a relevant impact on circularity.
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41
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An Assessment Approach to Circular Business Models within an Industrial Ecosystem for Sustainable Territorial Development. SUSTAINABILITY 2022. [DOI: 10.3390/su14020704] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
In this work, the authors have made an attempt to develop a methodological approach to substantiate the socio-economic efficiency of enterprise performance within an industrial ecosystem in the context of a circular economy. The proposed approach has been verified via a case study of the industrial ecosystem in Novokuznetsk city. Based on the calculations, it has been evidenced that the creation of an industrial ecosystem in the region where the city is located would eliminate area sources of pollution and improve the quality of life of the population, which would advance regional sustainable development and strengthen territorial attractiveness for citizens. Thus, having used the proposed methodology, the prospects for the implementation of circular business models by enterprises in order to increase the efficiency of resource use and balanced and sustainable economic development of a territory have been substantiated. The transition to a circular economy can support the creation of favorable environmental conditions and increase the local community resilience, well-being, and quality of life.
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42
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Amaral WDSD, Mendes MTDA, Câmara JVF, Pierote JJA, Reis FDS, Matos JMED, Fialho ACV, Moura WLD. Surface and micromechanical analysis of polyurethane plates with hydroxyapatite for bone structure. POLIMEROS 2022. [DOI: 10.1590/0104-1428.20220058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
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43
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Jeya G, Dhanalakshmi R, Anbarasu M, Vinitha V, Sivamurugan V. A short review on latest developments in catalytic depolymerization of Poly (ethylene terephathalate) wastes. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2021.100291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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44
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Towards recycling purpose: converting PET plastic waste back to terephthalic acid using pH-responsive phase transfer catalyst. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2021.10.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Safety Evaluation of Polyethylene Terephthalate Chemical Recycling Processes. SUSTAINABILITY 2021. [DOI: 10.3390/su132212854] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Polyethylene terephthalate (PET) is one of the main packaging materials for beverage bottles. Even if this polymer is good to recycle, mechanical recycling processes need a well-sorted input fraction. For less-sorted PET packaging, or even non-food input sources, chemical recycling seems to be a solution to increase PET recycling. For post-consumer recyclates in packaging applications, it is essential that the safety of the recyclates is guaranteed, and the consumers’ health protected. For mechanical recycling processes, evaluation criteria are already established. For chemical recycling processes, however, such evaluation criteria are only roughly available. This study evaluated the safety of the chemical recycling process similar to the approach of the European Food Safety Authority (EFSA). However, due to the lack of information about the contamination level of the input materials for the chemical recycling process, the evaluation was adapted. In addition, the evaluation should be performed separately for the depolymerisation and for the repolymerisation steps. However, due to the high cleaning efficiencies of both steps, the evaluation can focus on the repolymerisation. This simplifies the assessment of the chemical recycling processes considerably.
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Sarda P, Hanan JC, Lawrence JG, Allahkarami M. Sustainability performance of polyethylene terephthalate, clarifying challenges and opportunities. JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20210495] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Parikshit Sarda
- Polymer Institute, Department of Chemical Engineering University of Toledo Toledo Ohio USA
| | - Jay C. Hanan
- Mechanical and Aerospace Engineering Oklahoma State University Tulsa Oklahoma USA
| | - Joseph G. Lawrence
- Polymer Institute, Department of Chemical Engineering University of Toledo Toledo Ohio USA
| | - Masoud Allahkarami
- Mechanical and Aerospace Engineering Oklahoma State University Tulsa Oklahoma USA
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Polyolefins and Polyethylene Terephthalate Package Wastes: Recycling and Use in Composites. ENERGIES 2021. [DOI: 10.3390/en14217306] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Plastics are versatile materials used in a variety of sectors that have seen a rapid increase in their global production. Millions of tonnes of plastic wastes are generated each year, which puts pressure on plastic waste management methods to prevent their accumulation within the environment. Recycling is an attractive disposal method and aids the initiative of a circular plastic economy, but recycling still has challenges to overcome. This review starts with an overview of the current European recycling strategies for solid plastic waste and the challenges faced. Emphasis lies on the recycling of polyolefins (POs) and polyethylene terephthalate (PET) which are found in plastic packaging, as packaging contributes a signification proportion to solid plastic wastes. Both sections, the recycling of POs and PET, discuss the sources of wastes, chemical and mechanical recycling, effects of recycling on the material properties, strategies to improve the performance of recycled POs and PET, and finally the applications of recycled POs and PET. The review concludes with a discussion of the future potential and opportunities of recycled POs and PET.
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Crickmore TS, Sana HB, Mitchell H, Clark M, Bradshaw D. Toward sustainable syntheses of Ca-based MOFs. Chem Commun (Camb) 2021; 57:10592-10595. [PMID: 34559869 DOI: 10.1039/d1cc04032d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We report the use of benign and green precursors, including waste chicken eggshells and PET (polyethylene terephthalate) from recycled plastic bottles, for the facile synthesis of a variety of calcium-based metal-organic frameworks (Ca-MOFs), using water based and mechanochemical synthesis techniques.
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Affiliation(s)
- Tom S Crickmore
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, UK.
| | - Haamidah Begum Sana
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, UK.
| | - Hannah Mitchell
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, UK.
| | - Molly Clark
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, UK.
| | - Darren Bradshaw
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, UK.
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Roy PS, Garnier G, Allais F, Saito K. Strategic Approach Towards Plastic Waste Valorization: Challenges and Promising Chemical Upcycling Possibilities. CHEMSUSCHEM 2021; 14:4007-4027. [PMID: 34132056 DOI: 10.1002/cssc.202100904] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 06/13/2021] [Indexed: 06/12/2023]
Abstract
Plastic waste, which is one of the major sources of pollution in the landfills and oceans, has raised global concern, primarily due to the huge production rate, high durability, and the lack of utilization of the available waste management techniques. Recycling methods are preferable to reduce the impact of plastic pollution to some extent. However, most of the recycling techniques are associated with different drawbacks, high cost and downgrading of product quality being among the notable ones. The sustainable option here is to upcycle the plastic waste to create high-value materials to compensate for the cost of production. Several upcycling techniques are constantly being investigated and explored, which is currently the only economical option to resolve the plastic waste issue. This Review provides a comprehensive insight on the promising chemical routes available for upcycling of the most widely used plastic and mixed plastic wastes. The challenges inherent to these processes, the recent advances, and the significant role of the science and research community in resolving these issues are further emphasized.
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Affiliation(s)
- Pallabi Sinha Roy
- School of Chemistry, Monash University, Clayton, 3800, VIC, Australia
- BioPRIA, Department of Chemical Engineering, Monash University, Clayton, 3800, VIC, Australia
| | - Gil Garnier
- BioPRIA, Department of Chemical Engineering, Monash University, Clayton, 3800, VIC, Australia
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, 51110, Pomacle, France
| | - Florent Allais
- BioPRIA, Department of Chemical Engineering, Monash University, Clayton, 3800, VIC, Australia
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, 51110, Pomacle, France
| | - Kei Saito
- School of Chemistry, Monash University, Clayton, 3800, VIC, Australia
- BioPRIA, Department of Chemical Engineering, Monash University, Clayton, 3800, VIC, Australia
- Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto University, Higashi-Ichijo-Kan, Yoshida-nakaadachicho 1, Sakyo-ku, Kyoto, 606-8306, Japan
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Chemical Recycling of PET in the Presence of the Bio-Based Polymers, PLA, PHB and PEF: A Review. SUSTAINABILITY 2021. [DOI: 10.3390/su131910528] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The great increase in the production and consumption of plastics has resulted in large amounts of plastic wastes, creating a serious problem in terms of their environmentally friendly disposal. The need for the production of more environmentally friendly polymers gave birth to the production of biodegradable, and more recently, biobased polymers, used in the production of biodegradable or biobased plastics. Although the percentage of currently produced bioplastics is rather small, almost 1% compared to petrochemical-based plastics, inevitably is going to significantly increase in the near future due to strict legislation recently posed by the European Union and other countries’ Governments. Thus, recycling strategies that have been developed could be disturbed and the economic balance of this sector could be destabilized. In the present review, the recycling of the polymer mainly used in food plastic packaging, i.e., poly(ethylene terephthalate), PET is examined together with its counterparts from the biobased polymers, i.e., poly(lactic acid), PLA (already replacing PET in several applications), poly(3-hydroxybutyrate), PHB and poly(ethylene furanoate), PEF. Methods for the chemical recycling of these materials together with the chemical products obtained are critically reviewed. Specifically, hydrolysis, alcoholysis and glycolysis. Hydrolysis (i.e., the reaction with water) under different environments (alkaline, acidic, neutral), experimental conditions and catalysts results directly in the production of the corresponding monomers, which however, should be separated in order to be re-used for the re-production of the respective polymer. Reaction conditions need to be optimized with a view to depolymerize only a specific polymer, while the others remain intact. Alcoholysis (i.e., the reaction with some alcohol, methanol or ethanol) results in methyl or ethyl esters or diesters that again could be used for the re-production of the specific polymer or as a source for producing other materials. Glycolysis (reaction with some glycol, such as ethylene, or diethylene glycol) is much studied for PET, whereas less studied for the biopolymers and seems to be a very promising technique. Oligomers having two terminal hydroxyl groups are produced that can be further utilized as starting materials for other value-added products, such as unsaturated polyester resins, methacrylated crosslinked resins, biodegradable polyurethanes, etc. These diols derived from both PET and the bio-based polymers can be used simultaneously without the need for an additional separation step, in the synthesis of final products incorporating biodegradable units in their chemical structure.
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