Green Chemistry, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 1, 2025
Emerging technologies-empowered thermochemical plastic valorization is developed for value-added products in green and practical manner, which are beneficial to achieving circular economy several UN sustainable development goals.
Language: Английский
Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(16), P. 9457 - 9579
Published: Aug. 16, 2024
The large production volumes of commodity polyolefins (specifically, polyethylene, polypropylene, polystyrene, and poly(vinyl chloride)), in conjunction with their low unit values multitude short-term uses, have resulted a significant pressing waste management challenge. Only small fraction these is currently mechanically recycled, the rest being incinerated, accumulating landfills, or leaking into natural environment. Since are energy-rich materials, there considerable interest recouping some chemical value while simultaneously motivating more responsible end-of-life management. An emerging strategy catalytic depolymerization, which portion C-C bonds polyolefin backbone broken assistance catalyst and, cases, additional molecule reagents. When products molecules materials higher own right, as feedstocks, process called upcycling. This review summarizes recent progress for four major upcycling strategies: hydrogenolysis, (hydro)cracking, tandem processes involving metathesis, selective oxidation. Key considerations include macromolecular reaction mechanisms relative to mechanisms, design transformations, effect conditions on product selectivity. Metrics describing critically evaluated, an outlook future advances described.
Language: Английский
Citations
29
Energy & Fuels, Journal Year: 2024, Volume and Issue: 38(3), P. 1676 - 1691
Published: Jan. 22, 2024
Mechanical recycling of plastic waste is not sustainable and inefficient in terms the resources needed to accomplish process, quality materials obtained from this technique substandard. Chemical polymers appears be preferable because technology allows for production new materials. This review compiles most recent research which selected transition metals are used as catalysts hydrogenolytic depolymerization polyolefins a polymer upcycling process. Hydrogenolysis an emerging chemical method that uses transition-metal complexes presence hydrogen cleave C–C bonds substances into shorter hydrocarbons. Transition such Ruthenium (Ru), Platinum (Pt), Nickel (Ni), Cobalt (Co), Zirconium (Zr), Tantalum (Ta), Rhodium (Rh) have been utilized recently type reaction. hydrogenolysis can produce valuable hydrocarbon products, gas/liquid fuels lubricating oils, under relatively milder operational conditions with less environmental impact. The focused on supported metal organometal catalytic system their mechanism polyolefin pathways detailed investigation impact reaction parameters high gasoline, diesel, light lubricants.
Language: Английский
Citations
22
Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 487, P. 150468 - 150468
Published: March 15, 2024
Language: Английский
Citations
18
Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(15)
Published: Feb. 13, 2024
Abstract Hydrogen is one of the most important energy alternatives to conventional fossil‐based fuel. Solar based photocatalytic hydrogen evolution (PHE) a salient approach produce fuel but its efficiency generally limited by sluggish and energy‐unfavorable oxidation reaction. Meanwhile, waste treatment has become worldwide problem clean highly demanded avoid vast greenhouse emission currently. Inspiringly, PHE can be effectively coupled with favorable photooxidation many wastes, which kills two birds stone. In this review, recent progress in presented, where typical solid, liquid, gas wastes have been briefly discussed. Focusing on understanding complicated reaction mechanism revelation products, cutting‐edge techniques for photophysics surface chemistry characterization analyzed, are imperative facilitate following investigation. Finally, developing trend existing issues current research also discussed detail so that holistic blueprint portrayed accelerate their application realistic world.
Language: Английский
Citations
17
Energy Conversion and Management, Journal Year: 2025, Volume and Issue: 326, P. 119511 - 119511
Published: Jan. 16, 2025
Language: Английский
Citations
2
Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 338, P. 123071 - 123071
Published: July 6, 2023
Language: Английский
Citations
24
ChemSusChem, Journal Year: 2024, Volume and Issue: unknown
Published: May 17, 2024
Abstract Polystyrene is a staple plastic in the packaging and insulation market. Despite its good recyclability, willingness of PS recycling remains low, largely due to high cost limited profitability. This review examines research progresses, gaps, challenges areas that affect costs, including but not logistics, design, policymaking. We critically evaluate recent developments upcycling strategies, we particularly focus on tandem hydrogen‐atom transfer (HAT) strategies. conclude future studies should only reaction chemistry mechanisms also economic viability processes. The goal this stimulate development innovative strategies with low costs output values. hope technological momentum towards sustainable circular economy.
Language: Английский
Citations
11
Sustainable Production and Consumption, Journal Year: 2024, Volume and Issue: 48, P. 301 - 323
Published: May 29, 2024
Chemical recycling systems have been reported to enhance the environmental performance of plastic waste management. Life cycle assessment (LCA) has extensively employed evaluate potential benefits chemical compared with other systems. However, a disparity exists between outcomes assessments and anticipated recycling. Moreover, few reviews discussed findings these comparable studies. Therefore, herein, we aim analyze climate change implications further discuss whether it can achieve by conducting critical review scientific literature on based LCA methodology. The demonstrates that substantial range variability in impacts is evident, spanning −3.3 137.6 kg CO2 eq./kg. Besides, high observed for energy recovery, ranging from −6.8 68.1 In addition, multiple factors contributing inconsistent results, such as various technologies, composition, functional units, are analyzed depth provide an overview insights stakeholders. Furthermore, identify gaps current research outline directions future studies, providing guidance research.
Language: Английский
Citations
8
ACS ES&T Water, Journal Year: 2024, Volume and Issue: 4(4), P. 1688 - 1700
Published: Jan. 29, 2024
Plastic pollution has become a hot topic for researchers due to its ubiquitous presence in the environment. Technologies that can handle microplastics (MPs) aquatic ecosystems are still emerging and require more research practical viability. This study demonstrates hybrid approach combines Fenton reaction with hydrothermal process oxidize MPs. The system attained weight loss of 75.15% 16 h, increasing 93.79% 20 h 98.43% 24 h. water contact angle unaltered MPs was 86.9 ± 2.3°, which gradually decreased 53.27 0.8°, confirmed insertion carbonyl hydroxyl functional groups into polymer chain resulted an increase their hydrophilicity. alkyl radical mechanism might initiate pathway scissoring carbon chain. filtrate showed no ecotoxicity, meaning it would be safe enough disposed Therefore, this will provide basic understanding investigate further processes solve problem plastic achieve United Nations (UN) sustainable development goal (Goal No. 14: Life below water).
Language: Английский
Citations
7
Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 486, P. 150332 - 150332
Published: March 11, 2024
Language: Английский
Citations
7