One-dimensional titania nanotubes annealed at various temperatures for the photocatalytic degradation of low concentration gaseous pollutants |
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| Institution: | 1. Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan 609-735, Republic of Korea;2. Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea;1. Shandong Key Laboratory of Fluorine Chemistry and Chemical Materials, Jinan 250022, China;2. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China;3. Shandong Engineering Research Center for Fluorinated Material, Jinan 250022, China;1. Lund University, Department of Building and Environmental Technology, Division of Building Physics, Lund 221 00, Sweden;2. Lund University, Department of Building and Environmental Technology, Division of Building Services, Lund 221 00, Sweden;1. International Solar Energy Research Center (ISC), Rudolf-Diesel-Str. 15, 78467 Konstanz, Germany;2. Photovoltaik Institut Berlin AG, Wrangelstr. 100, 10977 Berlin, Germany;1. Department of Mining Engineering and Natural Resources, Universitat Politècnica de Catalunya, Bases de Manresa, 61-73, 08240 Manresa, Spain;2. Department of Chemical Engineering, Universitat Autònoma de Barcelona, Edifici Q, 08193 Bellaterra, Barcelona, Spain;1. Department of Health Protection, National Institute for Health and Welfare, Kuopio 70701, Finland;2. Department of Civil Engineering, Tampere University of Technology, Tampere 33101, Finland;3. Department of Environmental Technology, Kaunas University of Technology, Kaunas 50254, Lithuania;1. Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA 24061, USA;2. Department of Chemical Engineering, Virginia Tech, Blacksburg, VA 24061, USA |
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| Abstract: | In this study, one-dimensional titania nanotubes (TNTs) were synthesized using a combined process of chemical and hydrothermal treatments, and their activities for the photocatalytic reactions of selected gaseous pollutants at sub-ppm levels were determined. Additionally, the properties of the TNTs were examined using selected spectroscopic methods. The annealed TNTs showed higher photocatalytic activities for the four target compounds than did the unannealed TNTs. For all the target compounds except benzene, the effect of the annealing temperature on the degradation efficiency was difficult to determine because all degradation efficiencies were very high. However, for benzene, which decomposed with a low efficiency, the degradation activities of the TNTs increased as the treatment temperature was increased from 250 to 300 °C, while they decreased slightly when the temperature was increased from 300 to 400 °C. These findings confirm the presence of an optimal annealing temperature for the synthesis of TNTs. Moreover, the average degradation extents for benzene, toluene, ethylbenzene, and o-xylene decreased from 92%, 96%, 99%, and 98% to 77%, 86%, 92%, and 94%, respectively, as the airstream flow rate increased within the range of 1–4 L/min. The average degradation extents decreased from 12%, 75%, 87%, and 88% to 3%, 29%, 46%, and 51%, respectively, as the input concentration increased from 0.4 to 1.9 ppm. Overall, these findings suggest that one-dimensional TNTs can be effectively utilized for the degradation of gaseous pollutants under optimal operational conditions. |
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| Keywords: | Gaseous pollutant Annealing temperature Degradation efficiency Airstream flow rate |
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