Citation: Hui ZHANG, Li-Qing CHENG, Ming-Yue HU, Ming-Yu LI, Jian-Fei ZHENG, Si-Tian XIN, Cai-Hong FANG, Heng CHEN, Yi-Qiong YANG, Long-Hui NIE. Efficient degradation of RhB over BiOBr/g-C₃N₄ S-scheme heterojunction by a H₂O₂-free photo-self-Fenton catalysis[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(11): 2121-2130. doi: 10.11862/CJIC.2023.175 shu

Efficient degradation of RhB over BiOBr/g-C₃N₄ S-scheme heterojunction by a H₂O₂-free photo-self-Fenton catalysis

1.
School of Material and Chemistry Engineering, Hubei University of Technology, Wuhan 430068, China
2.
New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, Wuhan 430068, China

Corresponding author: Long-Hui NIE, nielonghui@mail.hbut.edu.cn
Received Date: 26 March 2023
Revised Date: 9 October 2023

Figures(9)

The fabrication of the BiOBr/g-C₃N₄ S-scheme heterojunction is an effective way to improve photocatalytic activity. Yet, its photocatalytic activity is expected to further improve, and its photo-Fenton catalytic activity for pollutant degradation in the absence of H₂O₂ has not been investigated up to now. In this work, a BiOBr/g-C₃N₄ S-scheme heterojunction photocatalyst was successfully prepared by a calcination-ultrasonic mixing method. Herein, its photo-self-Fenton catalytic activity was investigated for the first time in the absence of H₂O₂. The physical properties of the samples were characterized by X-ray polycrystalline powder diffractometer (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). Photocatalytic and photo-self-Fenton catalytic degradation of rhodamine B (RhB) were studied over BiOBr/g-C₃N₄ S-scheme heterojunction without/with Fe³⁺ in the absence of H₂O₂, respectively. The main active species in the photo-self-Fenton catalytic reaction were determined by capturing experiments, and the degradation mechanism of the photo-self-Fenton catalysis was proposed. The results showed that H₂O₂ could be formed in situ over the BiOBr/g-C₃N₄ S-scheme heterojunction under visible-light irradiation. The photogenerated current and the separation efficiency of photo-generated carriers can be greatly improved in the presence of Fe³⁺ over BiOBr/g-C₃N₄ S-scheme heterojunction, resulting in the enhancement of photocatalytic efficiency for RhB degradation in the photo-self-Fenton process than in the photocatalytic reaction without Fe³⁺. The reaction rate constant of photo-self-Fenton over BiOBr/g-C₃N₄ S-scheme heterojunction with Fe³⁺ was 0.208 min^-1, which was about 5.3 times that of photocatalysis without Fe³⁺. It also showed good stability in the recycling experiment. The addition of Fe³⁺ promotes the separation of photogenerated charges and the activation of generated H₂O₂ by the Fe²⁺/Fe³⁺ redox cycle. The results of capturing experiments show that superoxide anion radicals (·O₂^-) and holes (h⁺) are found the main active species, and ·O₂^-plays a more important role in photo-self-Fenton catalysis.
- BiOBr/g-C₃N₄,
- S-scheme heterojunction,
- photo-self-Fenton reaction,
- heterogenerous catalysis,
- catalytic mechanism
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通讯作者: 陈斌, bchen63@163.com

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Efficient degradation of RhB over BiOBr/g-C3N4 S-scheme heterojunction by a H2O2-free photo-self-Fenton catalysis

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通讯作者: 陈斌, bchen63@163.com

Efficient degradation of RhB over BiOBr/g-C₃N₄ S-scheme heterojunction by a H₂O₂-free photo-self-Fenton catalysis