Pyrolysis is an attractive upcycling method for researchers because the process is less sensitive to contamination and can produce products that have similar or more value than the feedstock [ 3 ]. Tandem catalytic strategies have been recently adopted for PE to improve the product selectivity, especially . 6 the conversion of waste polyolefin to value-added products via chemical upcycling has drawn tremendous attention in recent years, 7, 8 which mainly includes homogeneous, enzyme, and heterogeneous catalysis. This article reviews the . Sunlight is known to be the natural energy source that degrades plastic waste at a very slow rate. An attractive alternative is upcycling, which aims to dig out the embedded value to incentivize large-scale valorization of plastic wastes. polyolefins are the most demanded and used plastics with a proportion of approximately 57% of total plastics in the world (figure 1a ). sale price of virgin plastics (32). Therefore, great effort is required to avoid littering. One way to overcome this economic hurdle is to convert waste plastics into value-added materials or chemicals. We conclude with our perspective on the ongoing challenge and opportunities. The quality of recycled plastics gradually deteriorates because of the undesirable degradation in the recycling process. Subsequently, we highlight the advances in catalytic degradation of plastics to environmentally benign or degradable products and mineralization into carbon dioxide and water. Recently, there has been a shift in research to focus on producing fuel from plastic waste specifically. Plastic waste is a serious matter of concern due to its disruptive impact on the environment. Abstract: The rapid global consumption of single-use plastics has caused an unsustainable accumulation of plastic waste in landfills and the environment. Cell Rep. Phys. Under such background, catalytic upcycling, which can upgrade various plastic wastes into value-added products under mild conditions, has attracted recent attention as a promising strategy to treat plastic wastes. Photocatalytic Degradation of Plastic Waste: A Mini Review Plastic waste becomes an immediate threat to our society with ever-increasing negative impacts on our environment and health by entering our food chain. 9 Upcycling and catalytic degradation of plastic wastes. New strategies in targeted chemical upcycling of waste plastics offer unique opportunities . . recently reported on the selective conversion of high-density polyethylene (HDPE . plastic upcycling degradation recycling sustainability Published in Cell Reports Physical Science 109 PDF An attractive alternative is upcycling, which aims to dig out the embedded value to incentivize large-scale valorization of plastic wastes. Under such background, catalytic upcycling, which can upgrade various plastic wastes into value-added products under mild conditions, has attracted recent attention as a promising strategy to treat plastic wastes. While disposal and reclaim strategies represent the first lines of intervention to solve this problem . The upcycling to diphenylmethane was tested at 1-kg laboratory scale and attested by industrial-scale techno-economic analysis, demonstrating . The quality of recycled plastics gradually deteriorates because of the undesirable degradation in the recycling process. The reductive upcycling of polyolefins has opened the door for converting plastic wastes into fuels, lubricants, and waxes. Unfortunately, current mechanical recycling methods are expensive and produce lower-quality products. The degradation of nonrecoverable plastic wastes is. 3 Only 9% of plastic wastes Plastic pollution is a global concern due to the long half-life and high resistance of many synthetic plastics to natural biodegradation. Upcycling has been proposed to solve the low profitability and high market sensitivity of known recycling methods. The degradation of nonrecoverable plastic wastes is another necessity to treat the . This Review explores the challenges and opportunities associated with the catalytic transformation of waste plastics, looking at both chemical and biological approaches to transforming such spent . Upcycling and catalytic degradation of plastic wastes Qidong Hou,1Meinan Zhen, Hengli Qian,1Yifan Nie, Xinyu Bai, Tianliang Xia, Mian Laiq Ur Rehman,1Qiushi Li, and Meiting Ju1,* SUMMARY Variousrecyclingtechnologieshavebeendevelopedtodealwithplas- tic problems, but they face considerable economic and technological challenges in practice. Rationale for a Themed Collection in Applied Catalysis B: Catalytic conversion and upcycling of polymers is a fast-expanding field of catalysis research that is poised to play a critical role in the environmental abatement of disposed waste plastics and the decarbonization of the chemical industry by keeping carbon in a circular economy. U.S. Department of Energy Office of Scientific and Technical Information. Upcycling and catalytic degradation of plastic wastes. Upcycling to Fuels The main composition of many plastics, especially the carbon and hydrogen content in polyolefins, are similar to that of petroleum-derived hydrocarbons. This is the reason why the calorific value of plastic waste is almost equivalent to liquid fuels. The extensive use of plastic products has led to severe plastic pollution. . The cascade strategy is resilient to impurities from plastic waste streams and is generalizable to other high-value chemicals (e.g., benzophenone, 1,2-diphenylethane, and 4-phenyl-4-oxo butyric acid). However, the challenge of managing the ever-increasing quantities of plastic waste is daunting. Summary Various recycling technologies have been developed to deal with plastic problems, but they face considerable economic and technological challenges in practice. 38 , 39 As of 2015, 6,300 Mt of plastic wastes had been cumulatively generated; of which, 79% entered landlls or accumulated in the natural environment, and 12% was incinerated. This article reviews the current strategies and mechanisms of solar-driven catalytic plastic upcycling. Low-cost AlCl 3 catalyzes both the reactions of degradation and upcycling at ambient temperatures under atmospheric pressure. Several approaches have been explored, which include the use of waste plastic to make battery electrodes or photovoltaics films (7, 8).With regard to the upcycling of polyethylene, Bckstrm et al. selective, rapid, and one-step upcycling of real-world plastic wastes, including milk containers (hdpe), plastic bags (ldpe), food wraps (pp), and plastic foam (ps) to high purity h 2 and high-value carbon materials, predominantly in the form of multiwalled carbon nanotubes (mwcnts) has been achieved by microwave-initiated catalytic Search terms: Advanced search options. . 37 Polyethylene terephthalate (PET) is the most widely used polyester, with a global annual production of 70 million tons (Mt) for use in textiles, packaging, carpeting, and single-use beverage bottles. Sci., 2 (2021), Article 100514, 10.1016/j.xcrp.2021. Hou, Q., Zhen, M., Qian, H., Nie, Y., Bai, X., Xia, T., Ju, M. (2021). . The biodegradation of synthetic plastics, such as polyethylene (PE), polyethylene terephthalate (PET . Obtaining upcycling products with high economic values and high selectivity, preferably at mild reaction conditions to expand the prot margin, is thus a target of plastic chemical upcycling (7, 33). Plastic waste represents one of the most urgent environmental challenges facing humankind. The use of solar energy to drive waste plastic upcycling is expected to achieve simultaneous resource sustainability, clean energy storage, and environmental remediation. In this perspective, we discuss the catalytic upcycling of plastic polymers into high-value chemicals via indirect (mediated by monomers, oligomers, or their derivates and small platform molecules) or direct pathways. Cell Reports Physical Science, 2(8 . Most plastic wastes fall into four top categories ( Figure 1 A): polyester, polyolefin, polyvinyl chloride (PVC), and polystyrene (PS). The use of solar energy to drive waste plastic upcycling is expected to achieve simultaneous resource sustainability, clean energy storage, and environmental remediation. Article "Upcycling and catalytic degradation of plastic wastes" Detailed information of the J-GLOBAL is a service based on the concept of Linking, Expanding, and Sparking, linking science and technology information which hitherto stood alone to support the generation of ideas. The hydrogenolysis and the hydrocracking of polyolefins promoted by heterogeneous catalysts is emerging and a valid alternatives to pyrolysis since POs are transformed into valuable chemicals, fuels, lubricants and waxes. The . In this perspective, we illustrate that polymers can be depolymerized and transformed into high-value chemicals through three strategies: (1) depolymerization into monomers, oligomers, or other derivatives, followed by transformation into high-value chemicals; (2) degradation to small platform molecules (e.g., CO2, CH4, formic acid, and methanol) followed by upgradation; and (3) direct . This review comprehensively summarized the microorganisms and enzymes that are able to degrade a variety of generally used synthetic plastics and will contribute to building a conception of bio-upcycling plastic wastes by connecting the biodegradation of plastic wastes to the biosynthesis of valuable chemicals in microorganisms. By linking the information entered, we provide opportunities to make unexpected discoveries and obtain knowledge . Photocatalytic upcycling allows the reaction . Upcycling and catalytic degradation of plastic wastes Qidong Hou, M. Zhen, +6 authors M. Ju Engineering Cell Reports Physical Science 2021 25 Recent Advancements in Photocatalytic Valorization of Plastic Waste to Chemicals and Fuels Ai-Jan Chen, MinQuan Yang, Sibo Wang, Qingrong Qian Engineering Frontiers in Nanotechnology 2021

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