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Opportunities and challenges for plastic depolymerization by biomimetic catalysis
Summary
This paper explores biomimetic catalysis as a middle ground between harsh chemical recycling and fragile enzyme-based degradation of plastic waste. Researchers found that by mimicking the active centers and substrate-binding features of natural enzymes using stable inorganic materials, plastics could potentially be broken down under milder conditions. The study suggests this approach could combine the best of both worlds for more sustainable plastic recycling.
Plastic waste has imposed significant burdens on the environment. Chemical recycling allows for repeated regeneration of plastics without deterioration in quality, but often requires harsh reaction conditions, thus being environmentally unfriendly. Enzymatic catalysis offers a promising solution for recycling under mild conditions, but it faces inherent limitations such as poor stability, high cost, and narrow substrate applicability. Biomimetic catalysis may provide a new avenue by combining high enzyme-like activity with the stability of inorganic materials. Biomimetic catalysis has demonstrated great potential in biomass conversion and has recently shown promising progress in plastic degradation. This perspective discusses biomimetic catalysis for plastic degradation from two perspectives: the imitation of the active centers and the imitation of the substrate-binding clefts. Given the chemical similarity between biomass and plastics, relevant work is also included in the discussion to draw inspiration. We conclude this perspective by highlighting the challenges and opportunities in achieving sustainable plastic recycling via a biomimetic approach.