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Interfacial Reactions in Chemical Recycling and Upcycling of Plastics
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This review highlights the importance of understanding interfacial chemical reactions that occur during the depolymerization of plastics for chemical recycling and upcycling. Researchers emphasize that critical processes at the polymer-catalyst and polymer-fluid boundaries have been largely overlooked, yet they govern reaction efficiency. The study calls for more focused research on these interface dynamics to improve strategies for breaking down plastics, including environmental micro- and nanoplastics.
Depolymerization of plastics is a leading strategy to combat the escalating global plastic waste crisis through chemical recycling, upcycling, and remediation of micro-/nanoplastics. However, critical processes necessary for polymer chain scission, occurring at the polymer-catalyst or polymer-fluid interfaces, remain largely overlooked. Herein, we spotlight the importance of understanding these interfacial chemical processes as a critical necessity for optimizing kinetics and reactivity in plastics recycling and upcycling, controlling reaction outcomes, product distributions, as well as improving the environmental sustainability of these processes. Several examples are highlighted in heterogeneous processes such as hydrogenation over solid catalysts, reaction of plastics in immiscible media, and biocatalysis. Ultimately, judicious exploitation of interfacial reactivity has practical implications in developing practical, robust, and cost-effective processes to reduce plastic waste and enable a viable post-use circular plastics economy.
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Researchers reviewed the three main degradation pathways of plastic materials from a surface chemistry perspective: chemical, biological, and mechanical degradation. They described how these processes can occur consecutively or simultaneously in the environment, ultimately producing microplastics. The study provides a scientific framework for understanding how plastics break down into smaller particles, which is essential for developing strategies to address microplastic pollution.
Advanced Catalytic Strategies for Plastic Depolymerization: Mechanistic Insights, Catalyst Engineering, and Sustainable Upcycling Pathways
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Researchers reviewed catalytic approaches to breaking down plastic waste — including homogeneous, heterogeneous, biocatalytic, photocatalytic, and plasma-assisted methods — cataloguing the mechanistic pathways, catalyst design strategies, and emerging technologies needed to convert polyethylene, polystyrene, PET, and polypropylene into reusable monomers and fuels.
Interfacial Phenomena of Plastics: From Surface Modifications to Environmental Impacts
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This review examines the interfacial phenomena of plastics, covering how surface modifications affect plastic properties and how surface characteristics drive environmental impacts including pollutant sorption, biofilm formation, and ecosystem interactions once plastics enter natural environments.
Colloid and Interface Science for Understanding Microplastics and Developing Remediation Strategies
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This perspective article argues that principles from colloid and interface science are essential for understanding how microplastics behave in the environment. Researchers explain how surface chemistry, particle shape, and roughness govern how microplastics interact with water, soil, and other pollutants. The study identifies wastewater treatment plants as critical hotspots where microplastics accumulate in sludge and get reintroduced to the environment through agricultural application.
Advanced Catalytic Strategies for Plastic Depolymerization: Mechanistic Insights, Catalyst Engineering, and Sustainable Upcycling Pathways
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Researchers reviewed the full landscape of catalytic plastic depolymerization strategies — homogeneous, heterogeneous, biocatalytic, photocatalytic, and pyrocatalytic — assessing how nanostructured materials, metal-organic frameworks, enzyme engineering, and emerging plasma or electrocatalytic methods can convert waste polymers into reusable monomers and fuels.
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