Mixed plastics waste valorization through tandem chemical oxidation and biological funneling

Science, Journal Year: 2022, Volume and Issue: 378(6616), P. 207 - 211

Published: Oct. 13, 2022

Mixed plastics waste represents an abundant and largely untapped feedstock for the production of valuable products. The chemical diversity complexity these materials, however, present major barriers to realizing this opportunity. In work, we show that metal-catalyzed autoxidation depolymerizes comingled polymers into a mixture oxygenated small molecules are advantaged substrates biological conversion. We engineer robust soil bacterium, Pseudomonas putida, funnel compounds single exemplary product, either β-ketoadipate or polyhydroxyalkanoates. This hybrid process establishes strategy selective conversion mixed useful

Language: Английский

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The Chemical Recycling of Polyesters for a Circular Plastics Economy: Challenges and Emerging Opportunities

ChemSusChem, Journal Year: 2021, Volume and Issue: 14(19), P. 4041 - 4070

Published: April 7, 2021

Abstract Whilst plastics have played an instrumental role in human development, growing environmental concerns led to increasing public scrutiny and demands for outright bans. This has stimulated considerable research into renewable alternatives, more recently, the development of alternative waste management strategies. Herein, aim was highlight recent developments catalytic chemical recycling two commercial polyesters, namely poly(lactic acid) (PLA) poly(ethylene terephthalate) (PET). The concept is first introduced, associated opportunities/challenges are discussed within context governing depolymerisation thermodynamics. Chemical methods PLA PET then discussed, with a particular focus on upcycling use metal‐based catalysts. Finally, attention shifts emergence new materials potential modernise economy. Emerging opportunities challenges industrial feasibility.

Language: Английский

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Enzymes’ Power for Plastics Degradation

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(9), P. 5612 - 5701

Published: March 14, 2023

Plastics are everywhere in our modern way of living, and their production keeps increasing every year, causing major environmental concerns. Nowadays, the end-of-life management involves accumulation landfills, incineration, recycling to a lower extent. This ecological threat environment is inspiring alternative bio-based solutions for plastic waste treatment toward circular economy. Over past decade, considerable efforts have been made degrade commodity plastics using biocatalytic approaches. Here, we provide comprehensive review on recent advances enzyme-based biocatalysis design related processes recycle or upcycle plastics, including polyesters, polyamides, polyurethanes, polyolefins. We also discuss scope limitations, challenges, opportunities this field research. An important message from that polymer-assimilating enzymes very likely part solution reaching

Language: Английский

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How to Build a Microplastics‐Free Environment: Strategies for Microplastics Degradation and Plastics Recycling

Advanced Science, Journal Year: 2022, Volume and Issue: 9(6)

Published: Jan. 6, 2022

Microplastics are an emergent yet critical issue for the environment because of high degradation resistance and bioaccumulation. Unfortunately, current technologies to remove, recycle, or degrade microplastics insufficient complete elimination. In addition, fragmentation mismanaged plastic wastes in have recently been identified as a significant source microplastics. Thus, developments effective removal methods, well as, plastics recycling strategies crucial build microplastics-free environment. Herein, this review comprehensively summarizes eliminating from highlights two key aspects achieve goal: 1) Catalytic into environmentally friendly organics (carbon dioxide water); 2) catalytic upcycling monomers, fuels, valorized chemicals. The mechanisms, catalysts, feasibility, challenges these methods also discussed. Novel such photocatalysis, advanced oxidation process, biotechnology promising eco-friendly candidates transform benign valuable products. future, more effort is encouraged develop conversion products with efficiency, product selectivity, low cost under mild conditions.

Language: Английский

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Waste to Wealth: Chemical Recycling and Chemical Upcycling of Waste Plastics for a Great Future

ChemSusChem, Journal Year: 2021, Volume and Issue: 14(19), P. 4123 - 4136

Published: May 17, 2021

Abstract The linear approach to resource utilization has led the accumulation of waste plastic in environment for decades. Unfortunately, both traditional mechanical recycling and incineration have faced their bottlenecks that always resulted quality deterioration value recovery failures. Recently, chemical upcycling processes, including conversion plastics into virgin monomers, liquid fuels, or feedstocks produce value‐added products, been identified as most promising strategy recovering from plastics. However, these methods are often cost prohibitive relying on stringent conditions compared current methods. Accordingly, this Minireview summarizes recent trends achievements We highlight three research topics: depolymerization monomers; degradation fuels waxes; hydrogen, fine feedstocks, functional materials. Indeed, is a bright path circular environmentally friendly economy.

Language: Английский

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Why is Recycling of Postconsumer Plastics so Challenging?

ACS Applied Polymer Materials, Journal Year: 2021, Volume and Issue: 3(9), P. 4325 - 4346

Published: Aug. 23, 2021

The ubiquitous use of plastics has been driven by their combination low cost and properties, but these attributes directly challenge waste management schemes for plastic recycling. Some postconsumer recycling programs are now nearly 50 years old, a significant fraction still finds landfills or other dumping strategies at end life. With the growing concern regarding waste, especially ocean plastics, there is need innovation alternative economic translation to valued product(s) that will promote efficient circular utilization. This review first describes technical hurdles associated with then it focuses on providing an overview emergent recover through new polymer design, processes, chemical transformations value-added products. Specific challenges discussed include sorting separations, product variability including additives, high efficiency/low in which existing petrochemical industry can produce virgin polymers, particular polyolefins. Although wide variety have demonstrated both mechanical means, commercial success different generally limited either performance, large variance key metrics, economics where products match performance materials process expensive. Successful capture likely depend incentives government regulations.

Language: Английский

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Chemical Recycling of Polystyrene to Valuable Chemicals via Selective Acid-Catalyzed Aerobic Oxidation under Visible Light

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(14), P. 6532 - 6542

Published: March 30, 2022

Chemical recycling is one of the most promising technologies that could contribute to circular economy targets by providing solutions plastic waste; however, it still at an early stage development. In this work, we describe first light-driven, acid-catalyzed protocol for chemical polystyrene waste valuable chemicals under 1 bar O2. Requiring no photosensitizers and only mild reaction conditions, operationally simple has also been demonstrated in a flow system. Electron paramagnetic resonance (EPR) investigations density functional theory (DFT) calculations indicate singlet oxygen involved as reactive species degradation process, which abstracts hydrogen atom from tertiary C–H bond, leading hydroperoxidation subsequent C–C bond cracking events via radical process. Notably, our study indicates adduct acid catalyst might be formed situ, act photosensitizer initiate formation oxygen. addition, oxidized polymer may play role production light.

Language: Английский

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Recent Progress in the Chemical Upcycling of Plastic Wastes

ChemSusChem, Journal Year: 2021, Volume and Issue: 14(19), P. 4137 - 4151

Published: May 18, 2021

The massive generation of plastic wastes without satisfactory treatment has induced severe environmental problems and gained increasing attentions. In this Minireview, recent progresses in the chemical upcycling by using various methods (mainly past three to five years) is summarized. points out a "plastic-based refinery" concept, which use as platform feedstocks produce highly valuable monomeric or oligomeric compounds, putting back into circular economy. different upcycle wastes, including hydrogenolysis, photocatalysis, pyrolysis, solvolysis, others, are introduced each section valorize diverse value-added chemicals, materials, fuels. addition, other emerging technologies well new thermosets covered.

Language: Английский

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From trash to treasure: Chemical recycling and upcycling of commodity plastic waste to fuels, high-valued chemicals and advanced materials

Journal of Energy Chemistry, Journal Year: 2022, Volume and Issue: 69, P. 369 - 388

Published: Jan. 10, 2022

Language: Английский

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Photocatalytic Conversion of Plastic Waste: From Photodegradation to Photosynthesis

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(22)

Published: April 21, 2022

Abstract Plastic waste remains a global challenge due to the massive amounts being produced without satisfactory treatment technologies for recycling and upcycling. Photocatalytic processes are emerging as green promising approaches upcycle plastics into value‐added products under mild conditions using sunlight energy source. In this review, recent advances in plastic conversion through photocatalysis have been comprehensively summarized. Special emphasis is placed on photocatalytic mechanism selective CC CH bond transformations of access fuels, chemicals, materials. Finally, challenges perspectives establishing new paradigm toward sustainable circular economy also put forward.

Language: Английский

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