Photoinduced Production of Chlorine Molecules from Titanium Dioxide Surfaces Containing Chloride

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Li , Y , Nie , W , Liu , Y , Huang , D , Xu , Z , Peng , X , George , C , Yan , C , Tham , Y J , Yu , C , Xia , M , Fu , X , Wang , X , Xue , L , Wang , Z , Xu , Z , Chi , X , Wang , T & Ding , A 2020 , ' Photoinduced Production of Chlorine Molecules from Titanium Dioxide Surfaces Containing Chloride ' , Environmental Science & Technology Letters , vol. 7 , no. 2 , pp. 70-75 . https://doi.org/10.1021/acs.estlett.9b00704

Title: Photoinduced Production of Chlorine Molecules from Titanium Dioxide Surfaces Containing Chloride
Author: Li, Yuanyuan; Nie, Wei; Liu, Yuliang; Huang, Dandan; Xu, Zheng; Peng, Xiang; George, Christian; Yan, Chao; Tham, Yee Jun; Yu, Chuan; Xia, Men; Fu, Xiao; Wang, Xinfeng; Xue, Likun; Wang, Zhe; Xu, Zhengning; Chi, Xuguang; Wang, Tao; Ding, Aijun
Contributor: University of Helsinki, Department of Physics
University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
Date: 2020-02
Language: eng
Number of pages: 6
Belongs to series: Environmental Science & Technology Letters
ISSN: 2328-8930
URI: http://hdl.handle.net/10138/324441
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 Cl-2 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 Cl-2 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 O-2 via photoactivated TiO2 to form Cl-2 and probably the O-2(-) radical. In addition to Cl-2, ClO and HOCl were also observed via the complex reactions between Cl/Cl-2 and HOx. An intensive campaign was conducted in Shanghai, during which evident daytime peaks of Cl-2 were observed. Estimated Cl-2 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 Cl-2. Our results suggest a non-negligible role of TiO2 in atmospheric photochemistry via altering the radical budget.
Subject: NITRYL CHLORIDE
NITROUS-ACID
CHEMISTRY
OZONE
TIO2
PHOTOCATALYSIS
SITE
O-2
114 Physical sciences
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