Defects and interface states related photocatalytic properties in reduced and subsequently nitridized Fe3O4/TiO2
来源期刊:JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第6期
论文作者:Chang Liu Xiang Zhu Peng Wang Yisen Zhao Yongqing Ma
文章页码:931 - 941
摘 要:The Fe3O4@TiO2 catalyst was reduced in a mixed H2/N2 atmosphere at temperatures of 400, 600, 800 and 1000?C in order to produce the oxygen vacancies(Ov) and Ti3+; Simultaneously, Fe3O4 was reduced to Fe, a strongly magnetic material, beneficial for the magnetic separation after the photo-degradation.The optimal catalyst was obtained at the reducing temperature of 800?C, which possesses the good photocatalytic performance and recycled activities; Moreover, its saturation magnetization Msis highest,reaching 23.8 emu g-1 which improves the magnetic separability. This optimal catalyst was subsequently treated in the NH3 atmosphere at temperatures of 500, 600 and 700?C, aiming to investigate the effects of N-doping in TiO2. The 600?C treated catalyst exhibited the optimal photocatalytic performance. The factors that affect the photocatalytic performance are revealed and discussed in detail, including the ratio of Ovand N dopant in TiO2 as well as the interface states between TiO2 and the magnetic particles.
Chang Liu,Xiang Zhu,Peng Wang,Yisen Zhao,Yongqing Ma
Anhui Key Laboratory of Information Materials and Devices, School of Physics and Materials Science, Anhui University
摘 要:The Fe3O4@TiO2 catalyst was reduced in a mixed H2/N2 atmosphere at temperatures of 400, 600, 800 and 1000?C in order to produce the oxygen vacancies(Ov) and Ti3+; Simultaneously, Fe3O4 was reduced to Fe, a strongly magnetic material, beneficial for the magnetic separation after the photo-degradation.The optimal catalyst was obtained at the reducing temperature of 800?C, which possesses the good photocatalytic performance and recycled activities; Moreover, its saturation magnetization Msis highest,reaching 23.8 emu g-1 which improves the magnetic separability. This optimal catalyst was subsequently treated in the NH3 atmosphere at temperatures of 500, 600 and 700?C, aiming to investigate the effects of N-doping in TiO2. The 600?C treated catalyst exhibited the optimal photocatalytic performance. The factors that affect the photocatalytic performance are revealed and discussed in detail, including the ratio of Ovand N dopant in TiO2 as well as the interface states between TiO2 and the magnetic particles.
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