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Boosting photocatalytic mineralization of polystyrene microplastics with a TiO2@UiO-66 advanced semiconductor composite
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Scientists created a new material that combines two compounds (TiO2 and UiO-66) to break down polystyrene microplastics—like those from styrofoam and plastic packaging—using UV light, destroying about 63% of the plastic particles in water over 30 hours. This matters because microplastics are increasingly found in our water, food, and even our bodies, and this research points toward a possible future technology for cleaning them out of water supplies before they reach us. That said, this is early-stage lab research, and more work is needed before it could be used in real-world water treatment.
ABSTRACT This graphical abstract illustrates the structure of the TiO2@UiO-66 composite and the Z-scheme diagram in terms of photogenerated electron and hole transfer for PS decomposition. Photocatalysis is a promising technology for the removal of microplastics from aquatic environments. A current research focus lies in developing photocatalytic materials capable of efficiently degrading microplastics under visible or ultraviolet (UV) light irradiation. In this study, a TiO2@UiO-66 heterostructured nanocomposite was synthesized and employed for the photocatalytic degradation of polystyrene (PS) microplastics under UV illumination at room temperature. The synthesized materials were characterized by XRD, SEM, UV–Vis/DRS, PL spectroscopy, XPS, and EDX mapping. The TiO2@UiO-66 composite exhibited significantly higher photocatalytic activity toward PS microplastic degradation compared with pristine TiO2 and UiO-66 under UV light irradiation. Approximately 63% of PS microplastics (150 ppm) were degraded after 30 h of irradiation at an intensity of 4 mW·cm−2 under natural pH conditions. The analysis of total organic carbon indicated a decline in the removal efficiency of PS microplastics with increasing concentration. Liquid chromatography–mass spectrometry and Fourier transform infrared analyses revealed the formation of soluble organic intermediates such as aldehydes and carboxylic acids during the degradation process. These results demonstrate that the TiO2@UiO-66 photocatalyst is a promising material for the removal of PS microplastics in aqueous environments, where the •OH, O2• - play a dominant role in the degradation mechanism.
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