Photocatalytic removal of NO and NO2 using titania nanotubes synthesized by hydrothermal method

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 i...

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Bibliographic Details
Published inJournal of environmental sciences (China) Vol. 26; no. 5; pp. 1180 - 1187
Main Authors Nguyen, Nhat Huy, Bai, Hsunling
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.05.2014
Subjects
Adsorption
Air Pollutants - chemistry
Catalysis
environmental photocatalysis
Hot Temperature
indoor air pollution control
Microscopy, Electron, Scanning
Nanotubes - chemistry
Nitric Oxide - chemistry
nitrogen oxides
Nitrous Oxide - chemistry
NO2
Photochemical Processes
TiO2
Titanium - chemistry
TNTs
二氧化钛纳米管
催化剂表面
催化脱除
光催化剂
光催化反应
水热法合成
煅烧温度
environmental photocatalysis
indoor air pollution control
nitrogen oxides
TNTs
TiO2
TiO
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Summary: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℃ 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.
Bibliography:nitrogen oxides;TNTs;TiO2;indoor air pollution control;environmental photocatalysis
Nhat Huy Nguyen, Hsunling Bai（ Institute of Environmental Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan, Chinese Taipei）
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℃ 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.
11-2629/X
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1001-0742
1878-7320
DOI:10.1016/S1001-0742(13)60544-6