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Visible-light-induced oxidative removal of nitrogen oxides in air by metal chloride-modified titanium(IV) oxide nanoparticles

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Various metal chloride-modified titanium(IV) oxide (TiO2) (MCMT) samples were prepared by loading metal chloride on commercial TiO2 nanoparticles (Ishihara ST-01) having a large specific surface area and used for photoinduced oxidative removal of nitrogen oxides (NOx) in air under irradiation of visible light and/or ultraviolet (UV) light. The NOx removal activity of MCMT samples under photoirradiation from a blue fluorescent lamp (BFL) with a UV cut filter decreased in the following order: RhCl3/ST-01 > H2PtCl6/ST-01 > RuCl3/ST-01 > ST-01 > IrCl4/ST-01 > HAuCl4/ST-01, indicating that RhCl3, H2PtCl6 and RuCl3 fixed on TiO2 effectively worked as photosensitizers for NOx removal. NOx was almost quantitatively fixed as nitrate on RhCl3/ST-01 photoirradiated with BFL or blue light-emitting diodes. Under irradiation of both visible light and UV light from a white fluorescent lamp, RhCl3/ST-01 exhibited a higher level of removal of NOx and a much lower level of release of nitrogen dioxide than did bare ST-01, indicating that RhCl3/ST-01 effectively utilized both visible light and UV light and that two types of reaction (photosensitization by fixed RhCl3 and photocatalysis by TiO2) occurred over RhCl3/ST-01.

Affiliations: 1: Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University, Kowakae, Higashiosaka, Osaka 577-8502, Japan; 2: Interdisciplinary Graduate School of Science and Technology, Kinki University, Kowakae, Higashiosaka, Osaka 577-8502, Japan


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