Citation: Yang-Fan SU, Lin-Zhen WU, Yi-Lin LI, Rui LI, Pan HE, Ling ZHANG, You-Kui ZHANG, Jie-Hong LEI, Tao DUAN. Construction of type-Ⅱ TiO₂/g-C₃N₄ heterojunction promoting efficient photocatalytic reduction of U(Ⅵ)[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(4): 689-698. doi: 10.11862/CJIC.2023.029 shu

Construction of type-Ⅱ TiO₂/g-C₃N₄ heterojunction promoting efficient photocatalytic reduction of U(Ⅵ)

Yang-Fan SU ^{1, 2, #} ,
Lin-Zhen WU ^{2, 3, #} ,
Yi-Lin LI ^{2, 3} ,
Rui LI ^{2, 3} ,
Pan HE ^{2, 3} ,
Ling ZHANG ^{2, 3} ,
You-Kui ZHANG ^{2, 3} ,
Jie-Hong LEI ^1,, ,
Tao DUAN ^{2, 3,,}

1.
School of Physics and Astronomy, China West Normal University, Nanchong, Sichuan 637009, China
2.
National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
3.
Sichuan Tianfu New Area Innovation Institute, Southwest University of Science and Technology, Chengdu 610299, China

Corresponding author: Jie-Hong LEI, leijiehong@cwnu.edu.cn Tao DUAN, duant@ustc.edu.cn
Received Date: 12 October 2022
Revised Date: 22 February 2023

Figures(10)

TiO₂/g-C₃N₄(T-CN) composite catalyst was successfully prepared by hydrothermal reaction of hollow tubular g-C₃N₄ and TiO₂ nanosheets.Its morphology, structure, and photophysical properties were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectrum (UV-Vis DRS), and photocurrent response.The effect of different amounts of TiO₂ on the photoreduction and fixation of U(Ⅵ) by T-CN was studied.The results showed that when the mass ratio of TiO₂ to g-C₃N₄ was 20%, the removal rate of U(Ⅵ) by T-CN-20 was 85.64% in 60 min, which was 4.0 times of that of pure phase g-C₃N₄.The removal rate of U(Ⅵ) was still more than 69.8% under the coexistence of 10 times of high concentration cations, and had excellent structural stability.According to the analysis of photocatalytic products, T-CN-20 reduced U(Ⅵ) to insoluble U (Ⅳ)(63.68%) for removal, which can effectively solve the problem of U(Ⅵ) pollution in uranium-containing nuclear wastewater.Based on the analysis of energy band theory, the type-Ⅱ photocatalysis mechanism of composite catalyst heterojunction was proposed.
- photocatalysis,
- TiO₂/g-C₃N₄,
- type-Ⅱ heterojunction,
- uranium reduction,
- nuclear wastewater
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Construction of type-Ⅱ TiO₂/g-C₃N₄ heterojunction promoting efficient photocatalytic reduction of U(Ⅵ)