Cambridge team turns plastic into vinegar with sunlight
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- Cambridge team developed an iron‑doped carbon nitride catalyst that uses sunlight and hydrogen peroxide to convert common plastic waste into acetic acid.
- The catalyst drives a two‑step light‑activated reaction that first generates hydroxyl radicals to oxidize polymer chains and then reduces the resulting CO₂ into acetic acid.
- The process operates at room temperature and atmospheric pressure, contrasting with conventional chemical recycling that requires high heat and pressure.
- PVC showed particularly strong degradation performance, likely because chlorine released during its breakdown creates additional reactive radicals.
- A preliminary techno‑economic assessment suggests that producing a valuable chemical from waste plastic could offset costs, especially when environmental benefits are accounted for, though the need for sustainable hydrogen peroxide supply remains a challenge.
Why it matters: The low‑temperature, sunlight‑driven conversion could let waste‑management firms and chemical producers capture value from discarded plastics, reducing reliance on energy‑heavy methanol carbonylation and cutting greenhouse‑gas emissions, while the need for sustainable hydrogen‑peroxide supply remains a practical hurdle and could improve the economics of circular‑economy initiatives.
