A bismuth-rich Bi4O5Br2/TiO2 composites fibers photocatalyst enables dramatic CO2 reduction activity

LI Yuejun; CAO Tieping; SUN Dawei

doi:10.13801/j.cnki.fhclxb.20230222.004

Volume 40 Issue 11

Oct. 2023

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Acta Materiae Compositae Sinica > 2023 > 40(11): 6251-6259. > DOI: 10.13801/j.cnki.fhclxb.20230222.004

LI Yuejun, CAO Tieping, SUN Dawei. A bismuth-rich Bi₄O₅Br₂/TiO₂composites fibers photocatalyst enables dramatic CO₂ reduction activity[J]. Acta Materiae Compositae Sinica, 2023, 40(11): 6251-6259. DOI: 10.13801/j.cnki.fhclxb.20230222.004

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A bismuth-rich Bi₄O₅Br₂/TiO₂composites fibers photocatalyst enables dramatic CO₂ reduction activity

Baicheng Normal University, Research Centre of Nano-Photocatalyst, Baicheng 137000, China

Funds: National Natural Science Foundation of China (21573003); Natural Science Foundation of Jilin Province (20140101118JC)

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Received Date: December 12, 2022
Revised Date: February 05, 2023
Accepted Date: February 09, 2023
Available Online: February 21, 2023

Abstract

Abstract

Photocatalytic reduction technology of CO₂ can not only achieve energy saving and emission reduction, but also alleviate energy shortage, which is in line with today's concept of green and sustainable development. By employing electrospun TiO₂ nanofibers as substrate, bismuth-rich Bi₄O₅Br₂/TiO₂ composite fibers were prepared combining with in-situ hydrothermal reduction method. The composition, morphology and photoelectric properties were characterized by XRD, SEM, HRTEM, XPS, UV-Vis and carbon adsorption. The results show that the band gap of Bi₄O₅Br₂/TiO₂ composite fibers becomes width, there is obvious absorption in the visible light band, and the reduction ability of photogenerated electrons is enhanced. Bi₄O₅Br₂/TiO₂ composite fibers can reduce CO₂ to CH₄ and CO, while the enrichment of the metal Bi can not only improve the adsorption capacity of the catalyst for acidic CO₂ molecules and enhance the conversion efficiency, but also change the photocatalytic reaction path and generate alcohol products such as CH₃OH. The CH₄, CO and CH₃OH yields of the optimized photocatalyst Bi@Bi₄O₅Br₂/TiO₂ composite fibers were 3.87, 1.06 and 0.32 μmol·h⁻¹·g⁻¹, respectively, after simulated sunlight irradiation 3 h. This work provides new opportunities for exploring high-efficiency CO₂ photoreduction catalysts.
- bismuth-rich,
- Bi₄O₅Br₂/TiO₂ composite fibers,
- photocatalytic,
- CO₂ reduction,
- electrospinning

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A bismuth-rich Bi₄O₅Br₂/TiO₂composites fibers photocatalyst enables dramatic CO₂ reduction activity