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- W3000351668 abstract "Titanium dioxide (TiO2) is extensively used with the process of urbanization and potentially influences atmospheric chemistry, which is yet unclear. In this work, we demonstrated strong production of Cl2 from illuminated KCl-coated TiO2 membranes and suggested an important daytime source of chlorine radicals. We found that water and oxygen were required for the reactions to proceed, and Cl2 production increased linearly with the amount of coated KCl, humidity of the carrier gas, and light intensity. These results suggested that water promotes the reactivity of coated KCl via interaction with the crystal lattice to release free chloride ions (Cl–). The free Cl– transfer charges to O2 via photoactivated TiO2 to form Cl2 and probably the O2– radical. In addition to Cl2, ClO and HOCl were also observed via the complex reactions between Cl/Cl2 and HOx. An intensive campaign was conducted in Shanghai, during which evident daytime peaks of Cl2 were observed. Estimated Cl2 production from TiO2 photocatalysis can be up to 0.2 ppb/h when the TiO2-containing surface reaches 20% of the urban surface, and highly correlated to the observed Cl2. Our results suggest a non-negligible role of TiO2 in atmospheric photochemistry via altering the radical budget." @default.
- W3000351668 created "2020-01-23" @default.
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- W3000351668 date "2020-01-13" @default.
- W3000351668 modified "2023-10-17" @default.
- W3000351668 title "Photoinduced Production of Chlorine Molecules from Titanium Dioxide Surfaces Containing Chloride" @default.
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- W3000351668 doi "https://doi.org/10.1021/acs.estlett.9b00704" @default.
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