Adsorption and Photocatalytic Kinetics of Visible-Light Response N-Doped TiO2 Nanocatalyst for Indoor Acetaldehyde Removal under Dark and Light Conditions
Understanding the removal nature of the indoor volatile organic compounds under realistic environment conditions would give clear guidance for the development of air purification devices. The study investigated the removal of indoor acetaldehyde using visible-light-responsive N-doped TiO2 (N-TiO2) p...
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| Format: | Article |
| Language: | English |
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Wiley
2016-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2016/3058429 |
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| author | Yu-Hao Lin Chih-Huang Weng Jing-Hua Tzeng Yao-Tung Lin |
| author_facet | Yu-Hao Lin Chih-Huang Weng Jing-Hua Tzeng Yao-Tung Lin |
| author_sort | Yu-Hao Lin |
| collection | DOAJ |
| description | Understanding the removal nature of the indoor volatile organic compounds under realistic environment conditions would give clear guidance for the development of air purification devices. The study investigated the removal of indoor acetaldehyde using visible-light-responsive N-doped TiO2 (N-TiO2) photocatalyst under visible-light irradiation (light) and in the absence of light (dark). The adsorption kinetics of acetaldehyde onto N-TiO2 followed a pseudo-second-order model. The magnitude of acetaldehyde adsorption is proportional to temperature, and the results were fitted to the Langmuir isotherm model. Moreover, the effect of initial acetaldehyde concentration and visible-light intensity on the photooxidation of acetaldehyde was well described by the Langmuir-Hinshelwood model. Results show that the mesoporous N-TiO2 catalyst had a high ability to absorb acetaldehyde in the dark condition, and then acetaldehyde was subsequently photooxidized under visible-light irradiation. The adsorption capacity was found to increase with decreasing temperature. The negative value of ΔG° and the positive value of ΔS° indicate that the adsorption of acetaldehyde onto N-TiO2 was a spontaneous process. Finally, a reaction scheme for removal process of indoor acetaldehyde by N-TiO2 was proposed. |
| format | Article |
| id | doaj-art-140f675ca1ae4c57885a9c7df8b8a3fa |
| institution | OA Journals |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-140f675ca1ae4c57885a9c7df8b8a3fa2025-08-20T02:04:51ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2016-01-01201610.1155/2016/30584293058429Adsorption and Photocatalytic Kinetics of Visible-Light Response N-Doped TiO2 Nanocatalyst for Indoor Acetaldehyde Removal under Dark and Light ConditionsYu-Hao Lin0Chih-Huang Weng1Jing-Hua Tzeng2Yao-Tung Lin3Centre for Environmental Restoration and Disaster Reduction, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 40227, TaiwanDepartment of Civil and Ecological Engineering, I-Shou University, Kaohsiung City 84008, TaiwanDepartment of Soil and Environmental Sciences, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 40227, TaiwanDepartment of Soil and Environmental Sciences, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 40227, TaiwanUnderstanding the removal nature of the indoor volatile organic compounds under realistic environment conditions would give clear guidance for the development of air purification devices. The study investigated the removal of indoor acetaldehyde using visible-light-responsive N-doped TiO2 (N-TiO2) photocatalyst under visible-light irradiation (light) and in the absence of light (dark). The adsorption kinetics of acetaldehyde onto N-TiO2 followed a pseudo-second-order model. The magnitude of acetaldehyde adsorption is proportional to temperature, and the results were fitted to the Langmuir isotherm model. Moreover, the effect of initial acetaldehyde concentration and visible-light intensity on the photooxidation of acetaldehyde was well described by the Langmuir-Hinshelwood model. Results show that the mesoporous N-TiO2 catalyst had a high ability to absorb acetaldehyde in the dark condition, and then acetaldehyde was subsequently photooxidized under visible-light irradiation. The adsorption capacity was found to increase with decreasing temperature. The negative value of ΔG° and the positive value of ΔS° indicate that the adsorption of acetaldehyde onto N-TiO2 was a spontaneous process. Finally, a reaction scheme for removal process of indoor acetaldehyde by N-TiO2 was proposed.http://dx.doi.org/10.1155/2016/3058429 |
| spellingShingle | Yu-Hao Lin Chih-Huang Weng Jing-Hua Tzeng Yao-Tung Lin Adsorption and Photocatalytic Kinetics of Visible-Light Response N-Doped TiO2 Nanocatalyst for Indoor Acetaldehyde Removal under Dark and Light Conditions International Journal of Photoenergy |
| title | Adsorption and Photocatalytic Kinetics of Visible-Light Response N-Doped TiO2 Nanocatalyst for Indoor Acetaldehyde Removal under Dark and Light Conditions |
| title_full | Adsorption and Photocatalytic Kinetics of Visible-Light Response N-Doped TiO2 Nanocatalyst for Indoor Acetaldehyde Removal under Dark and Light Conditions |
| title_fullStr | Adsorption and Photocatalytic Kinetics of Visible-Light Response N-Doped TiO2 Nanocatalyst for Indoor Acetaldehyde Removal under Dark and Light Conditions |
| title_full_unstemmed | Adsorption and Photocatalytic Kinetics of Visible-Light Response N-Doped TiO2 Nanocatalyst for Indoor Acetaldehyde Removal under Dark and Light Conditions |
| title_short | Adsorption and Photocatalytic Kinetics of Visible-Light Response N-Doped TiO2 Nanocatalyst for Indoor Acetaldehyde Removal under Dark and Light Conditions |
| title_sort | adsorption and photocatalytic kinetics of visible light response n doped tio2 nanocatalyst for indoor acetaldehyde removal under dark and light conditions |
| url | http://dx.doi.org/10.1155/2016/3058429 |
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