|
| Efficient degradation of RhB over BiOBr/g-C3N4 S-scheme heterojunction by a H2O2-free photo-self-Fenton catalysis |
| Author Name | Affiliation | E-mail | | ZHANG Hui | School of Material and Chemistry Engineering, Hubei University of Technology, Wuhan 430068, China | | | CHENG Li-Qing | School of Material and Chemistry Engineering, Hubei University of Technology, Wuhan 430068, China | | | HU Ming-Yue | School of Material and Chemistry Engineering, Hubei University of Technology, Wuhan 430068, China | | | LI Ming-Yu | School of Material and Chemistry Engineering, Hubei University of Technology, Wuhan 430068, China | | | ZHENG Jian-Fei | School of Material and Chemistry Engineering, Hubei University of Technology, Wuhan 430068, China | | | XIN Si-Tian | School of Material and Chemistry Engineering, Hubei University of Technology, Wuhan 430068, China | | | FANG Cai-Hong | School of Material and Chemistry Engineering, Hubei University of Technology, Wuhan 430068, China | | | CHEN Heng | School of Material and Chemistry Engineering, Hubei University of Technology, Wuhan 430068, China | | | YANG Yi-Qiong | School of Material and Chemistry Engineering, Hubei University of Technology, Wuhan 430068, China | | | NIE Long-Hui | School of Material and Chemistry Engineering, Hubei University of Technology, Wuhan 430068, China
New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, Wuhan 430068, China | nielonghui@mail.hbut.edu.cn |
|
| Abstract: 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. |
| Keywords: BiOBr/g-C3N4 S-scheme heterojunction photo-self-Fenton reaction heterogenerous catalysis catalytic mechanism |
| Hits: 2277 |
| Download times: 1356 |
| ZHANG Hui,CHENG Li-Qing,HU Ming-Yue,LI Ming-Yu,ZHENG Jian-Fei,XIN Si-Tian,FANG Cai-Hong,CHEN Heng,YANG Yi-Qiong,NIE Long-Hui.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. |
| View Full Text View/Add Comment Download reader |
|
|
|
|
|
|
|
|
