Fabrication of nitrogen-doped TiO2 monolith with well-defined macroporous and bicrystalline framework and its photocatalytic performance under visible light |
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| Affiliation: | 1. Department of Natural and Mathematic Sciences, Turin Polytechnic University in Tashkent, Malaya Kolsevaya 17, Tashkent 100095, Uzbekistan;2. Department of Chemistry, National University of Uzbekistan, Vuzgorodok 15, Tashkent 100174, Uzbekistan;3. Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, Kanagawa 226-8503, Japan;4. Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt, Petersenstr. 32, Darmstadt 64287, Germany;5. Department of Chemistry, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan;1. Departamento de Farmacología, Facultad de Veterinaria, Universidad de Santiago de Compostela, 27002 Lugo, Spain;2. Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA;3. Worm Institute for Research and Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA;4. Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA;5. Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, CA 92093, USA;6. Department of Chemistry, BioScience Research Collaborative, Rice University, Houston, TX 77030, USA;1. Institute of Power Source & Eco-materials Science, Hebei University of Technology, Tianjin 300130, China;2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China;3. Chemical Engineering Program, The Petroleum Institute, P.O. Box 2533 Abu Dhabi, United Arab Emirates;1. Materials Science and Technology Division, Oak Ridge National Laboratory, United States;2. Materials Science and Engineering Department, North Carolina State University, United States;1. Department of Civil Engineering, 2 Eylul Campus, Anadolu University, Eskisehir 26480, Turkey;2. Department of Civil and Environmental Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, USA;3. Department of Civil and Environmental Engineering, University of Maryland, College Park, MD 20742, USA;4. Department of Civil and Environmental Engineering, George Mason University, Fairfax, VA 22030, USA;1. Department of Medical Imaging and Radiological Sciences, I-Shou University, Kaohsiung City 82445, Taiwan;2. Department of Nuclear Medicine, E-DA Hospital, I-Shou University, Kaohsiung City 82445, Taiwan;3. Department of Radiology, E-DA Hospital, I-Shou University, Kaohsiung City 82445, Taiwan;4. Department of Chinese Medicine for Post-Baccalaureate, I-Shou University, Kaohsiung City 82445, Taiwan |
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| Abstract: | In this study, hierarchically porous bicrystalline nitrogen-doped titania (N-doped TiO2) monolithic material was fabricated by a simple two-step approach: (i) preparation of TiO2 porous monolith by a sol–gel process of titanium alkoxide in a mild condition utilizing a chelating agent and mineral salt and (ii) annealing of TiO2 porous monolith obtained under a modest flow of ammonia gas at 700 °C for 2 h. The phase composition, crystal structure, morphology, pore structure, and porous properties of the final product were studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), mercury porosimetry, and nitrogen physisorption measurement, respectively. The resultant N-doped TiO2 porous monolith possesses a bicrystalline (anatase and rutile) framework with a well-defined macroporosity. The results from X-ray photoelectron spectroscopy (XPS) confirm the formation of O TiN bonds in the N-doped TiO2 porous monolith. The photocatalytic activity of N-doped TiO2 porous monolith was evaluated by the photodegradation of Rhodamine B over the samples under visible light. Nearly 50% of Rhodamine B in aqueous solution was efficiently degraded by N-doped TiO2 porous monolith with the mixed-phase of anatase and rutile under visible light within 120 min. |
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| Keywords: | Titania monolith Nitrogen doping Porosity Ammonolysis Photocatalyst |
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