One-step preparation of size-defined aggregates of TiO2 nanocrystals with tuning of their phase and composition |
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| Affiliation: | 1. Department of Chemical Engineering, National Tsing Hua University, Taiwan;2. Department of Engineering and System Science, National Tsing Hua University, Taiwan;3. Material & Chemical Research Laboratory, Industrial Technology Research Institute, Taiwan;1. Division of Dental Biomaterials, Department of Restorative Dentistry, Indiana University School of Medicine, Indianapolis, Indiana;3. Department of Biostatistics, Indiana University School of Medicine, Indianapolis, Indiana;2. Department of Conservative Dentistry, Faculty of Dentistry, The University of Jordan, Amman, Jordan;1. Maxillofacial Surgery Unit, University Hospital of Sassari, Sassari, Italy;2. Dentistry Unit, University Hospital of Sassari, Italy;3. Private Practice, Los Angeles, CA, USA;4. GIDE Institute, USA;1. Dalmia Institute of Scientific & Industrial Research, Rajgangpur, Sundargarh 770017, Odisha, India;2. Institute of Minerals & Materials Technology, Bhubaneswar 751013, Odisha, India;3. Department of Earth Sciences, Sambalpur University, Jyoti Vihar, Burla 768019, Odisha, India;1. Jiangsu University, Zhenjiang 212013, China;2. Engineering Technology Center for Heavy Metal Wastewater Treatment and Recovery, Environmental Protection Department of Jiangsu Province, Yixing 214200, China;3. Jiangsu ATK Environment Engineering Design and Research Institute Co., Ltd., Yixing 214200, China;1. KITE, Toronto Rehab - University Health Network, Toronto, Canada;2. Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Canada;3. Department of Nutritional Science, University of Toronto, Toronto, Canada;4. Division of Cardiology, Department of Medicine, Sinai Health System, Toronto, Canada;5. Women''s College Research Institute, Women''s College Hospital, Toronto, Canada |
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| Abstract: | One-step route based on the thermal decomposition of the double salt (NH4)2TiO(SO4)2 (ammonium titanyl sulfate, ATS) is presented to prepare size-defined aggregates of Ti-based nanoparticles with structural hierarchy. The component of Ti-based networks is tunable from anatase/rutile TiO2, nitrogen-doped TiO2, TiNxO1?x, to TiN depending on the atmospheres and reaction temperatures. The as-prepared Ti-based powders were characterized by X-ray diffraction analysis (XRD), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectra (DRS), and BET surface area techniques. It is found that TiO2 in the predominant rutile phase could be achieved by the thermal decomposition of ATS in flowing Ar gas. Furthermore, the nitrogen-doped TiO2, TiNxO1?x solid solution and TiN were prepared by the thermal decomposition of ATS in flowing NH3 gas by varying the temperatures. The network of anatase TiO2 with a specific surface area up to 64 m2 g?1 contains large mesopores with a mean diameter of ca. 15 nm, and the large pore size allows more accessible surface and interface available for the photocatalytic degradation of large-molecule dyes. The photocatalytic activity of the prepared TiO2 and nitrogen-doped TiO2 under UV–vis light irradiation is compared to Degussa P-25 using the photocatalytic degradation of methylene blue (MB) as a model reaction. The anatase TiO2 nanoparticles derived from one-step route show the highly efficient photocatalytic activity for the degradation of MB in comparison with Degussa P-25. The presence of large-sized rutile in the TiO2 powder decreases the specific surface area and thus the powder exhibits a lower photocatalytic activity. |
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