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Impact of emissions of airborne TiO2 ENM on atmospheric NO2 concentrations

Abstract : Titanium dioxide is one of the most produced engineered nanomaterials (ENMs) worldwide. Its high photocatalytic activity is key to many applications. Like any other ENM, TiO2 may be released into the atmosphere during nearly any phase of its lifecycle, where it may interact with atmospheric gases. It is well known and widely exploited that TiO2 photocatalytically reduces NO2 in the presence of UV light, however, the effect of accidentally released TiO2 ENMs on ambient NOx concentrations is widely unknown. We here present a comprehensive study on experimental laboratory investigations on the reaction rates of NO2 in the presence of TiO2 ENM (Evonik P25) under UV irradiation. The study is carried out in a dedicated test rig, where defined concentrations of TiO2 ENMs and NO2 are exposed to UV light. Both the UV light intensity and exposure time are adjustable. In a parallel study, the emission rates of engineered metal oxide nanomaterials from industrial facilities have been experimentally determined in field measurements and are used as surrogates for the TiO2 concentrations used in our lab-experiments. Experimental data on both the emission rates, as well as the chemical reaction rates, are used along with emission inventory data as input parameters for long range modeling of TiO2 and NOx concentrations across Europe using LOTOS-EUROS (see Figure 1) to better understand the dispersion of engineered nanomaterials and their impact on atmospheric chemistry. The poster will present results of the laboratory experiments and the field measurements and how these data are used in the model. First modeling results will be shown and it will be discussed how modeling can help improve the understanding of the presence and effects of engineered nanomaterials in the atmosphere.
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https://hal-ineris.archives-ouvertes.fr/ineris-03239320
Contributor : Gestionnaire Civs <>
Submitted on : Thursday, May 27, 2021 - 2:37:11 PM
Last modification on : Friday, May 28, 2021 - 3:11:35 AM

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  • HAL Id : ineris-03239320, version 1

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Christof Asbach, Ali Mohammadi-Nasrabadi, Carmen Nickel, Ana Maria Todea, Jean-Marc Lacome, et al.. Impact of emissions of airborne TiO2 ENM on atmospheric NO2 concentrations. 6. International Conference Nanosafe, Nov 2018, Grenoble, France. pp.199. ⟨ineris-03239320⟩

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