Photocatalytic properties of CoOx-loaded nano-crystalline perovskite oxynitrides ABO2N (A = Ca,Sr, Ba,La; B = Nb,Ta) |
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| Institution: | 1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China;2. Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310027, PR China;1. State Key Laboratory of Silicon Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, PR China;2. Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310027, PR China;1. Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, 72 Wenhua Road, Shenyang 110016, China;1. Faculty of Engineering, Hokkaido University, N13W8, Kita-ku, Sapporo 060-8628, Japan;2. Institute of Materials Structure Science, High Energy Accelerator Organization, 203-1, Shirakata, Tokai-Mura, Naka-gun, Ibaraki 319-1106, Japan;3. School of High Energy Accelerator Science, Sokendai (The Graduate University for Advanced Studies), Tokai 319-1106, Japan;1. State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China;2. College of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot 010022, China;3. Physics Department, Beijing Technology and Business University, Beijing 100048, China;1. Faculty of Engineering, Hokkaido University, N13W8, Kita-ku, Sapporo 060-8628, Japan;2. Institute of Materials Structure Science, High Energy Accelerator Organization, 203-1, Shirakata, Tokai-Mura, Naka-gun, Ibaraki 319-1106, Japan |
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| Abstract: | Highly crystalline niobium- and tantalum-based oxynitride perovskite nanoparticles were obtained from hydrothermally synthesized oxide precursors by thermal ammonolysis at different temperatures. The samples were studied with respect to their morphological, optical and thermal properties as well as their photocatalytic activity in the decomposition of methyl orange. Phase pure oxynitrides were obtained at rather low ammonolysis temperatures between 740 °C (CaNbO2N) and 1000 °C (BaTaO2N). Particle sizes were found to be in the range 27 nm–146 nm and large specific surface areas up to 37 m2 g−1 were observed. High photocatalytic activities were found for CaNbO2N and SrNbO2N prepared at low ammonolysis temperatures. CoOx as co-catalyst was loaded on the oxynitride particles resulting in a strong increase of the photocatalytic activities up to 30% methyl orange degradation within 3 h for SrNbO2N:CoOx. |
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| Keywords: | Oxynitrides Soft-chemistry synthesis Ammonolysis Photocatalysis Dye degradation |
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