Defects and interface states related photocatalytic properties in reduced and subsequently nitridized Fe3O4/TiO2. Issue 6 (June 2018)

• Record Type: Journal Article
• Authors: Liu, Chang; Zhu, Xiang; Wang, Peng; Zhao, Yisen; Ma, Yongqing
• Is Part Of: Journal of materials science & technology. Volume 34:Issue 6(2018)
• Page Start: 931
• Page End: 941
• Publication Date: 2018-06
• Subjects: Photocatalyst -- Strong magnetic particles -- Magnetic separability -- Oxygen vacancy -- Nitrogen doping; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2017.09.019
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: The Fe3 O4 @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 Ti 3+ ; Simultaneously, Fe3 O4 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 M s is 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 Ov and N dopant in TiO2 as well as the interface states between TiO2 and the magnetic particles.