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Efficient photocatalytic degradation of polystyrene microplastics in water over core–shell BiO2−x/CuBi2O4 heterojunction with full spectrum light response
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Researchers developed a new light-activated material that can break down polystyrene microplastics in water, causing significant surface damage to the plastic within 15 days. The material works across the full light spectrum, making it more practical than treatments requiring specific light conditions. While still in the laboratory stage, this photocatalytic approach could eventually provide a way to remove microplastics from water before they reach people.
Microplastics pose a significant threat to ecosystems due to their persistence, mobility, and accumulation of toxins. Here, an excellent core-shell structure of BiO/CuBiO p-n heterojunction (CBBO) with broad spectrum response was designed for efficient photodegradation of microplastics in water. Here, faced with the extremely difficult to degrade polystyrene plastic, the synthesized 5-CBBO with optimal photocatalytic activity caused severe damage to the surface of polystyrene (PS) after 15 d of full spectrum light irradiation. Compared to it, the damage to the PS surface by the photocatalytic reactions mediated by BiO and CuBiO alone, and the irradiation of full spectrum light was negligible after 30 d. Besides, the analysis of Fourier Transform Infrared Spectroscopy and Gas Chromatography-Mass Spectrometry demonstrated that the photocatalytic degradation of PS by 5-CBBO leads to significant structural changes, including the breakdown of alkyl chains, aromatic rings, and the formation of oxygenated products such as benzoic acid, confirming its effectiveness in transforming PS into smaller, more environmentally benign compounds. Finally, the photo-electrochemical testing and theoretical calculations have revealed the reaction mechanism of enhanced carrier separation and improved photocatalytic activity. This study showcases photocatalysts as a clean technology to reduce microplastic pollution, while providing insights for designing more efficient systems.
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