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Visible light photocatalytic degradation of polypropylene microplastics in a continuous water flow system
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Researchers developed a photocatalytic system using visible light and a semiconductor catalyst to degrade polypropylene microplastics in flowing water. The approach offers a potentially sustainable way to remove microplastics from treated wastewater effluents before they enter waterways.
Microplastic pollution of water and ecosystem is attracting continued attention worldwide. Due to their small sizes (≤5 mm) microplastic particles can be discharged to the environment from treated wastewater effluents. As microplastics have polluted most of our aquatic ecosystems, often finding its way into drinking water, there is urgent need to find new solutions for tackling the menace of microplastic pollution. In this work, sustainable green photocatalytic removal of microplastics from water activated by visible light is proposed as a tool for the removal of microplastics from water. We propose a novel strategy for the elimination of microplastics using glass fiber substrates to trap low density microplastic particles such as polypropylene (PP) which in parallel support the photocatalyst material. Photocatalytic degradation of PP microplastics spherical particles suspended in water by visible light irradiation of zinc oxide nanorods (ZnO NRs) immobilized onto glass fibers substrates in a flow through system is demonstrated. Upon irradiation of PP microplastics for two weeks under visible light reduced led to a reduction of the average particle volume by 65%. The major photodegradation by-products were identified using GC/MS and found to be molecules that are considered to be mostly nontoxic in the literature.
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Visible light photocatalytic degradation of polypropylene microplastics in a continuous water flow system
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Researchers proposed a photocatalytic approach using glass fiber substrates coated with visible-light-activated photocatalysts to trap and degrade low-density polypropylene microplastics from water, demonstrating plastic mass loss and oxidative degradation products in a continuous flow system.
Novel CuMgAlTi-LDH Photocatalyst for Efficient Degradation of Microplastics under Visible Light Irradiation
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Scientists developed a new photocatalyst material that breaks down polystyrene and polyethylene microplastics under visible light. The catalyst achieved significant degradation rates and worked through generating reactive oxygen species that attack plastic surfaces. This technology offers a promising green approach to removing microplastic pollution from water.
Degradation of Microplastic Residuals in Water by Visible Light Photocatalysis
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Researchers demonstrated that zinc oxide-based photocatalysts activated by visible light can degrade low-density polyethylene microplastic residues in water. This photocatalytic approach could offer an energy-efficient method for reducing microplastic contamination in aquatic environments.
Integration of Photocatalysis and Membrane Technology as a Hybrid System for Microplastic Degradation in Wastewater
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Researchers evaluated a hybrid system combining TiO2 photocatalysis with membrane filtration for degrading microplastics in wastewater. The photocatalytic membrane reactor demonstrated effective removal and degradation of polyethylene, polypropylene, and PET microplastics, suggesting that integrated photocatalytic-membrane systems could improve microplastic removal beyond what conventional wastewater treatment achieves.
Photocatalytic and biological technologies for elimination of microplastics in water: Current status
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This review examines emerging photocatalytic and biological technologies for breaking down microplastics in water, since conventional treatment facilities can capture but not fully destroy these particles. Researchers found that while photocatalysis and microbial degradation show promise, their effectiveness varies widely and the underlying mechanisms are only partly understood. The study highlights the urgent need for more efficient solutions to eliminate rather than simply filter out microplastic pollution from water supplies.
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