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Photothermal Mineralization of Polyolefin Microplastics via TiO2 Hierarchical Porous Layer‐Based Semiwetting Air‐Plastic‐Solid Interfaces
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Researchers developed a TiO2-based hierarchical porous layer that creates specialized interfaces for breaking down polyolefin microplastics using light-driven processes. The study suggests this photothermal mineralization approach overcomes the poor contact between oxygen, water-insoluble microplastics, and photocatalysts, offering a promising method for plastic waste remediation.
Photo-mineralization of microplastics under mild conditions has emerged as a promising solution to plastic waste disposal. However, the inadequate contact between oxygen, water-insoluble polyolefin microplastics, and photocatalysts remains a critical issue. In this study, a TiO2 hierarchical porous layer (TiO2-HPL) photocatalyst is presented to establish air-plastic-solid triphase interfaces for the photothermal mineralization of polyolefins. The wettability of the TiO2-HPL-based triphase interface is finely controlled from plastophobic to plastophilic. High-resolution imaging and finite element simulation demonstrate the significance of a semiwetting state in achieving multidirectional oxygen diffusion through the hierarchical pore structure while maintaining sufficient contact between the plastic phase and photocatalysts. For low-density polyethylene, the TiO2-HPL achieves a photothermal mineralization rate of 5.63 mmol g-1 h-1 and a conversion of 26.3% after 20 h of continuous irradiation. Additionally, the triphase photocatalytic system with semiwetting gas-plastic-solid interfaces shows good universality for various polyolefin reagents and products, illustrating its potential in achieving efficient photothermal mineralization of non-degradable microplastics.
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