Synergistic effects of hollow structure and surface fluorination on the photocatalytic activity of titania |
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| Authors: | Kangle Lv Jiaguo Yu Kejian Deng Jie Sun Yanxi Zhao Dongyun Du Mei Li |
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| Affiliation: | 1. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities, Wuhan 430074, China;2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;1. Department of Chemistry, Lakehead University, 955 Oliver Road, Thunder Bay, ON P7B 5E1, Canada;2. School of Chemical Engineering and Technology, Tianjin University, 92 Weijin Road, Tianjin 300072, China;3. College of Chemical Engineering, Taiyuan University of Technology, 79 Yingze Street, Taiyuan 030024, China;1. Chongqing Key Laboratory of Catalysis and New Environmental Materials, Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China;2. Department of Science and Environmental Studies, The Center for Education in Environmental Sustainability, The Education University of Hong Kong, Hong Kong, China;3. College of Materials Science and Engineering, National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, China;4. School of Materials Science and Technology, National Laboratory of Mineral Materials, China University of Geosciences, Beijing 100083, China;1. Department of Chemistry, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China;2. College of Chemical and Material Engineering, Quzhou College, Quzhou 324000, China;3. Department of Chemical Engineering, New Mexico State University, P.O. Box 30001, MSC 3805, Las Cruces, NM 88003, USA;1. Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon 305-350, Republic of Korea;2. Nano & Bio Research Division, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Republic of Korea;3. School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), 711-873, Republic of Korea;4. Nanomaterials Science and Engineering, University of Science & Technology, Daejeon 305-350, Republic of Korea |
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| Abstract: | To study the synergistic effects of hollow structure and surface fluorination on the photoactivity of TiO2, TiO2 hollow microspheres were synthesized by a hydrolysis–precipitate method using sulfonated polystyrene (PS) as templates and tetrabutylorthotitanate (TBOT) as precursor, and then calcined at 500 °C for 2 h. The calcined samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and N2 sorption. Photocatalytic activity was evaluated using reactive brilliant red X3B, an anionic organic dye, as a model pollutant in water. The results show that the photocatalytic activity of TiO2 hollow microspheres is significantly higher than that of TiO2 nanoparticles prepared in the same experimental conditions. At pH 7 and 3, the apparent rate constants of the former exceed that of the latter by a factor of 3.38 and 3.15, respectively. After surface fluorination at pH 3, the photoactivity of hollow microspheres and nanoparticles further increases for another 1.61 and 2.19 times, respectively. The synergistic effect of surface fluorination and hollow structure can also be used to prepare other highly efficient photocatalyst. |
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