Researchers converted carrot peel waste into carbon quantum dots and combined them with cuprous oxide to make a photocatalyst that degraded over 94% of Ponceau BS dye in water within 70 minutes under visible light. The work, published in Results in Chemistry, is a low-cost approach to treating textile dye pollution: the carrot peels need no chemical pretreatment, and the estimated production cost is about 55 rupees per 100 grams of catalyst. The catalyst works by using light to generate reactive oxygen species that break down synthetic dyes, which are hard to remove with conventional treatment. The study also notes the material stayed active across repeated cycles. But the authors caution that real wastewater tests, broader pH ranges, catalyst recovery at scale, and ecotoxicity checks are still needed. For now, it is a promising lab result showing how food waste could become part of industrial water treatment.
