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Interactions between titanium dioxide nanoparticles and polyethylene microplastics: Adsorption kinetics, photocatalytic properties, and ecotoxicity
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This study investigated how titanium dioxide nanoparticles interact with polyethylene microplastics in water and what the combined effects are on water fleas (Daphnia magna). Researchers found that the nanoparticles rapidly attached to microplastic surfaces and retained their ability to break down pollutants under UV light. The combination of these two common pollutants affected the mobility and behavior of the water fleas, suggesting that interactions between different types of pollution may create unexpected environmental risks.
The present study investigated the adsorption mechanism of titanium dioxide nanoparticles (nTiO) on polyethylene microplastics (MPs) and the resulting photocatalytic properties. This effort was supported by ecotoxicological assessments of MPs with adsorbed nTiO on the immobility and behaviour of Daphnia magna in presence and absence of UV irradiation. The results showed that nTiO were rapidly adsorbed on the surface of MPs (72% of nTiO in 9 h). The experimental data fit well with the pseudo-second order kinetic model. Both suspended nTiO and nTiO immobilized on MPs exhibited comparable photocatalytic properties, with the latter showing a lower effect on Daphnia mobility. A likely explanation is that the suspended nTiO acted as a homogeneous catalyst under UV irradiation and generated hydroxyl radicals throughout the test vessel, whereas the nTiO adsorbed on MPs acted as a heterogeneous catalyst and generated hydroxyl radicals only locally and thus near the air-water interface. Consequently, Daphnia, which were hiding at the bottom of the test vessel, actively avoided exposure to hydroxyl radicals. These results suggest that the presence of MPs can modulate the phototoxicity of nTiO - at least the location at which it is active - under the studied conditions.
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