標題: Photocatalytic removal of NO and NO2 using titania nanotubes synthesized by hydrothermal method
作者: Nhat Huy Nguyen
Bai, Hsunling
環境工程研究所
Institute of Environmental Engineering
關鍵字: nitrogen oxides;TNTs;TiO2;indoor air pollution control;environmental photocatalysis
公開日期: 1-May-2014
摘要: In this study, the photocatalysts of titania nanotubes (TNTs) were synthesized at different calcination temperatures using commercial Degussa TiO2 (P25) as a precursor. The materials were then characterized by BET, SEM, TEM, and XRD analyses. The photocatalytic reactions with NO and NO2 under UV-A irradiation were both performed. The results showed that the photocatalytic reaction rate of NO was much faster than that of NO2, and the conversion of NO2 to nitrate was the rate-limiting step for photocatalytic removal of NOx if the nitrate produced cannot be removed continuously from the photocatalyst surface. For TNTs calcined at different temperatures, a significant enhancement was observed on the total NOx removal efficiency by TNT calcined at 500 degrees C for both NO and NO2 photocatalytic reaction, which could be attributed to its high anatase crystallinity as well as high surface area. These two factors affect primarily on the NO2 conversion step in which the high anatase crystallinity could be responsible for the high efficiency at the beginning, while the high surface area could be accounted for retaining this high efficiency from nitric acid poisoning during the test period.
URI: http://dx.doi.org/10.1016/S1001-0742(13)60544-6
http://hdl.handle.net/11536/24199
ISSN: 1001-0742
DOI: 10.1016/S1001-0742(13)60544-6
期刊: JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
Volume: 26
Issue: 5
起始頁: 1180
結束頁: 1187
Appears in Collections:Articles