Unexpected release of HNO3 and related species from UV-illuminated TiO2 surface into air in photocatalytic oxidation of NO2 |
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| Authors: | Yoshihisa Ohko Yuri Nakamura Nobuaki Negishi Sadao Matsuzawa Koji Takeuchi |
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| Affiliation: | (1) Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), 16-1, Onogawa, Tsukuba Ibaraki, 305-8569, Japan |
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| Abstract: | We have discovered that HNO3 and related species are released from the TiO2 surface into air in the TiO2 photocatalytic oxidation of NO2 (1 ppm) under continuous UV light illumination (1 mW cm−2) by dehumidifying the outlet gas of the reaction and analyzing the recovered condensate liquid by ion chromatography. The origin of the HNO3 recovered in the dehumidifier could not be explained by a simple desorption of HNO3 overproduced on the TiO2 surface. The produced HNO3 must be activated on the TiO2 surface and causing the unidentified reaction. |
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