Citation: Tie-Ping CAO, Yue-Jun LI, Da-Wei SUN. Fabrication of Bi₂Ti₂O₇/TiO₂/Bi₄Ti₃O₁₂ multi-heterojunction and the enhanced visible photocatalytic performance[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(4): 699-708. doi: 10.11862/CJIC.2023.030 shu

Fabrication of Bi₂Ti₂O₇/TiO₂/Bi₄Ti₃O₁₂ multi-heterojunction and the enhanced visible photocatalytic performance

Research Centre of Nano-photocatalyst, Baicheng Normal University, Baicheng, Jilin 137000, China

Corresponding author: Yue-Jun LI, bc640628@163.com
Received Date: 21 October 2022
Revised Date: 17 February 2023

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In this work, we prepared double heterojunction Bi₂Ti₂O₇/TiO₂/Bi₄Ti₃O₁₂ composite nanofibers by employing electrospun TiO₂ nanofibers as the substrate, bismuth nitrate as the bismuth source, and potassium hydroxide as the mineralizing agent.Through a series of tests such as X-ray diffraction (XRD), scanning electron microscope (SEM), UV-visible diffuse reflectance spectrum (UV-Vis DRS), the phase composition, micromorphology, and optical properties of the Bi₂Ti₂O₇/TiO₂/Bi₄Ti₃O₁₂ catalyst were analyzed.The results showed that the TiO₂ changed type Ⅰ heterojunction into multi-heterojunction integrating two type Ⅱ heterojunctions.Photocatalytic tests demonstrated the activity of as-constructed multi-heterojunction was higher than that of single type Ⅰ or Ⅱ heterojunctions, respectively, where photogenerated electrons were accumulated on the surface of TiO₂ and photogenerated holes were accumulated on Bi₂Ti₂O₇ and Bi₄Ti₃O₁₂, respectively.The synergistic effect of Bi₂Ti₂O₇, Bi₄Ti₃O₁₂, and TiO₂ effectively improves the visible light absorption capacity, changes the transmission path of photo-generated carriers, and reduces the recombination probability of photogenerated electron-hole pairs, thereby obtaining the efficient photocatalytic degradation of CH₃CHO.The acetaldehyde degradation rate of Bi₂Ti₂O₇/TiO₂/Bi₄Ti₃O₁₂ reached 87.1% under visible light illumination for 8 h.
- TiO₂ nanofibers,
- multi-heterojunction,
- photocatalytic,
- hydrothermal method
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通讯作者: 陈斌, bchen63@163.com

Fabrication of Bi₂Ti₂O₇/TiO₂/Bi₄Ti₃O₁₂ multi-heterojunction and the enhanced visible photocatalytic performance