A novel method for fast and continuous preparation of superfine titanium dioxide nanoparticles in microfluidic system |
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| Institution: | 1. Institute of Chemistry, Federal University of Goiás - UFG, Campus Samambaia, Goiânia, GO, 74690-900, Brazil;2. School of Chemical Engineering, Federal University of Uberlândia - UFU, Campus Santa Mônica, Uberlândia, MG, 38408-144, Brazil;1. Dalian National Laboratory for Clean Energy, National Engineering Laboratory for MTO, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;1. Tianjin Key Laboratory of Biomaterial Research, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin 300192, China;2. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, China;3. NHC Key Laboratory of Hormones and Development, Tianjin Key Laboratory of Metabolic Diseases, Chu Hsien-I Memorial Hospital & Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin 300134, China;1. College of Chemical Engineering, Hebei University of Technology, Tianjin 300401, China;2. Qingdao Institue of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, Shandong, China;3. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Previously we had developed a microfluidic system that can be easily fabricated by bending a stainless-steel tube into large circular loops. In this study, a fast and continuous preparation method for superfine TiO2 nanoparticles (TiO2-NPs) was developed for the aforementioned microfluidic system. The proposed method can yield anatase TiO2 in 3.5 min, in contrast to the traditional hydrothermal reaction method, which requires hours or even days. Different reaction conditions, such as reaction temperature (120–200 °C), urea concentration (20–100 g/L), and tube length (5–20 m) were investigated. X-ray diffraction and Brunauer–Emmett–Teller analysis indicate that the as-prepared TiO2-NPs have crystalline sizes of 4.1–5.8 nm and specific surface areas of 250.7–330.7 m2/g. Transmission electron microscopy images show that these TiO2-NPs have an even diameter of approximately 5 nm. Moreover, because of their small crystalline sizes and large specific surface areas, most of these as-prepared TiO2-NPs exhibit considerably better absorption and photocatalytic performance with methylene blue than commercial P5 TiO2 does. |
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| Keywords: | Titanium dioxide Microfluidic system Nanoparticles Fast preparation Superfine |
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