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Citation: Feng-Juan ZHA, Qing LIU, Jian-You WANG, Yu-Han LIN, Chuan-Yi WANG, Ying-Xuan LI. One-Dimensional TiO2 Anatase/Rutile Heterophase Junctions: Preparation and Photocatalytic Properties for Degrading Formaldehyde[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(3): 510-518. doi: 10.11862/CJIC.2022.057 shu

One-Dimensional TiO2 Anatase/Rutile Heterophase Junctions: Preparation and Photocatalytic Properties for Degrading Formaldehyde

  • 1.

    School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China

  • 2.

    Yulin Yushen Industrial Zone Energy Technology Development Co., Ltd., Yulin, Shaanxi 719302, China

  • Corresponding author: Ying-Xuan LI, liyingxuan@sust.edu.cn
  • Received Date: 2 November 2021
    Revised Date: 19 January 2022

Figures(9)

  • TiO2 heterophase junctions are mainly prepared by high-temperature method, and it is difficult to control the morphology and composition of the prepared materials. Especially, it is still challenging to prepare a one-dimensional TiO2 heterophase junction at a lower temperature. In this paper, a simple and convenient one-step hydrothermal method was developed prepared one-dimensional nano-TiO2 heterophase junctions at a relatively low temperature (180 ℃). X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) analyses show that the one-dimensional rutile TiO2 nanorods (length: (400±50) nm, diameter: (60±5) nm) are the basic structure of the prepared materials, and the anatase TiO2 nanoparticles with uniform size distribution (diameter: (9.5±0.5) nm) are loaded on the nanorods in a high-density, monodispersed form. By adjusting the hydrothermal time, the anatase TiO2 contents in the prepared materials could be controlled within the range of 20%-50%. The TiO2 heterophase junctions were successfully applied to the photocatalytic degradation of formaldehyde. When the content of anatase phase TiO2 was 33% (TiO2-24, the hydrothermal time was 24 h), the TiO2 heterophase junction had the best formaldehyde degradation performance. After 25 min photocatalytic reaction, the 92% of formaldehyde (120 mg·L-1) was degraded into CO2 under a low-intensity LED lamp (wavelength: 365 nm, light intensity: 12.26 mW·cm-2), confirming the efficient activity of the TiO2 heterophase junction. Steady-state fluorescence spectroscopy and photoelec-trochemical tests showed that charge separation and transfer efficiencies on TiO2-24 were much higher than those on other samples prepared at different hydrothermal times. The one-dimensional TiO2 heterophase junction not only is beneficial to the transfer of photogenerated charge but also can directionally drive the separation of the charges, which makes one-dimensional TiO2 heterophase photocatalyst has a higher formaldehyde degradation performance.
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