Co-electrospinning fabrication and photocatalytic performance of TiO2/SiO2 core/sheath nanofibers with tunable sheath thickness |
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| Affiliation: | 1. Laboratory of Infrared Materials and Devices, The Advanced Technology Research Institute, Ningbo University, Ningbo 315211, China;2. School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China;3. Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China;1. College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China;2. Key Laboratory of Environmental Pollution Process and Environmental Criteria, Ministry of Education, Nankai University, PR China;3. Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, United States;4. Department of Chemistry, Tianjin University, Tianjin 300072, PR China;1. Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry and Science, North Carolina State University, Raleigh, NC 27695-8301, USA;2. Nano-Science and Nano-Engineering Program, Graduate School of Science, Engineering and Technology, Istanbul Technical University, Istanbul 34469, Turkey |
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| Abstract: | In this paper, core/sheath TiO2/SiO2 nanofibers with tunable sheath thickness were directly fabricated via a facile co-electrospinning technique with subsequent calcination at 500 °C. The morphologies and structures of core/sheath TiO2/SiO2 nanofibers were characterized by TGA, FESEM, TEM, FTIR, XPS and BET. It was found that the 1D core/sheath nanofibers are made up of anatase–rutile TiO2 core and amorphous SiO2 sheath. The influences of SiO2 sheath and its thickness on the photoreactivity were evaluated by observing photo-degradation of methylene blue aqueous solution under the irradiation of UV light. Compared with pure TiO2 nanofibers, the core/sheath TiO2/SiO2 nanofibers performed a better catalytic performance. That was attributed to not only efficient separation of hole–electron pairs resulting from the formation of heterojunction but also larger surface area and surface silanol group which will be useful to provide higher capacity for oxygen adsorption to generate more hydroxyl radicals. And the optimized core/sheath TiO2/SiO2 nanofibers with a sheath thickness of 37 nm exhibited the best photocatalytic performance. |
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| Keywords: | A. Nanostructures A. Oxides B. Chemical synthesis D. Catalytic properties |
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