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Photocatalytic strategies for mitigating microplastic pollution and greenhouse gas emissions
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This review summarizes research on light-activated catalysts, such as titanium dioxide and related materials, that can break down microplastic particles and may reduce associated methane and nitrous oxide emissions. It notes that confirming complete breakdown requires specific chemical tests, since partial breakdown can create toxic byproducts, and that practical use faces challenges like catalyst recovery and cost.
Microplastics contaminate water, soil, and air, and their persistence is linked to greenhouse gas emissions. Photocatalysis can break down these polymers via reactive oxygen species but particle shrinkage alone does not prove complete mineralization. Recent photocatalytic systems are examined, including TiO 2 -based materials, S-scheme and Z-scheme heterojunctions, laddered architectures, metal-organic frameworks, and g-C 3 N 4 composites. These systems improve charge separation and visible-light harvesting, with some achieving high mineralization under optimized conditions. Verifying true breakdown requires TOC, LC-MS, and GC-MS because incomplete oxidation can produce toxic intermediates. Photocatalysis may also shorten plastic residence times and reduce methane and nitrous oxide emissions, though this depends on carbon fate, catalyst stability, energy inputs, and water chemistry. Combining photocatalysis with renewable energy and water treatment could offer a practical route to microplastic management, provided catalyst recovery, toxicity, and scale-up challenges are addressed.
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TiO₂-based photocatalytic degradation of microplastics in water: Current status, challenges and future perspectives
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This review examines how titanium dioxide-based materials can break down microplastics in water using light energy, generating reactive molecules that dismantle plastic polymer chains. While promising, the technology still faces challenges with efficiency and potential harmful byproducts, and more research is needed before it can be used at scale to clean microplastics from real-world water supplies.
Advances in Photocatalytic Degradation of Emerging Microplastics: A Systematic Review
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This systematic review summarizes advances in using light-activated chemical processes to break down microplastics in the environment. The research shows that photocatalysis, especially using titanium dioxide, is a promising method for destroying microplastics without creating harmful byproducts, though more work is needed to speed up the process for real-world use.
Degradation of Emerging Plastic Pollutants from Aquatic Environments Using TiO2 and Their Composites in Visible Light Photocatalysis
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This review examines how titanium dioxide-based photocatalysts can degrade microplastics and nanoplastics under visible light conditions. Researchers found that while some composite materials achieved complete degradation of polystyrene particles, overall effectiveness remains limited at the laboratory scale. The study identifies key challenges and proposes future directions for developing more efficient photocatalytic approaches to plastic pollution remediation in water.
Investigation of the efficiency of several TiO2 microstructures for the photocatalytic degradation of nanoplastics.
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Researchers tested the efficiency of multiple titanium dioxide microstructures for photocatalytic degradation of nanoplastics in aquatic environments, addressing the growing problem of sub-micron plastic fragments in global water systems. TiO2-based photocatalysis showed varying effectiveness depending on catalyst structure and particle properties.
Photocatalytic Technologies for Transformation and Degradation of Microplastics in the Environment: Current Achievements and Future Prospects
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This review examines photocatalytic technologies that use light-activated materials to break down microplastics in the environment. Various catalysts can generate reactive oxygen species that degrade plastic polymers into simpler, less harmful molecules. The authors assess the strengths and limitations of different photocatalytic approaches and highlight the need for scalable solutions that work under real-world environmental conditions.
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