Synergistic effects of carbon coating and Bi-bridge in S-scheme C@CuO/Bi/Bi2MoO6 nanocomposites for enhanced photoreduction of Cr(VI)
(2024) In Journal of Environmental Chemical Engineering 12(6).- Abstract
The S-scheme mechanism in photocatalysis offers a promising approach to significantly enhance photoreductive activity. Here, using Bi dots as electronic media, and by changing the amount of added C@CuO on the surface of flower-shaped Bi2MoO6, a diverse range of CBM-x heterojunctions, were synthesized using a multi-step approach that incorporated solvothermal preparation and calcination methods. CBM-10 exhibited excellent photocatalytic activity: 96.9 % of Cr(VI) removal in 30 min, which was 38.0-fold better than CuO, 4.2-fold higher than pristine Bi2MoO6. Furthermore, even after five cycles of use, CBM-10 showed outstanding stability. Experiments to capture the active species revealed that... (More)
The S-scheme mechanism in photocatalysis offers a promising approach to significantly enhance photoreductive activity. Here, using Bi dots as electronic media, and by changing the amount of added C@CuO on the surface of flower-shaped Bi2MoO6, a diverse range of CBM-x heterojunctions, were synthesized using a multi-step approach that incorporated solvothermal preparation and calcination methods. CBM-10 exhibited excellent photocatalytic activity: 96.9 % of Cr(VI) removal in 30 min, which was 38.0-fold better than CuO, 4.2-fold higher than pristine Bi2MoO6. Furthermore, even after five cycles of use, CBM-10 showed outstanding stability. Experiments to capture the active species revealed that electrons play a crucial role in the photocatalytic reduction of Cr(VI). In these heterojunctions, carbon doping leads to the formation of coatings on the semiconductor materials to promote the migration and separation of photogenerated carriers. The presence of carbon coating is beneficial to improve the stability of CBM-10. Bi dots grown on Bi2MoO6 nanosheets can act as electron transport channels in C@CuO/Bi/Bi2MoO6, accelerate photoinduced carrier separation. The internal electric field, and the existence of “S-scheme” charge transfer mechanism was verified by the combination of atomic force microscope and synchronous illumination X-ray photoelectron spectroscopy. This process significantly mitigates the recombination of photo-induced carriers, enhancing the overall photoreduction efficacy. This study presents a novel method for developing S-scheme heterojunction to enhance the effectiveness of Cr(VI) decontamination, paves a promising route to heavy metal removal by mild photo-reductive system, and provides new insights into the design of photocatalysts with enhanced redox capabilities.
(Less)
- author
- Zhang, Luxin ; Li, Qunshuai ; Xing, Xu ; Li, Yunfeng ; Gao, Bo and Yu, Han LU
- organization
- publishing date
- 2024-12
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- C@CuO/Bi/Bi2MoO6, Cr(VI) reduction, S-scheme heterojunction, Visible-light photocatalysis, Wastewater treatment
- in
- Journal of Environmental Chemical Engineering
- volume
- 12
- issue
- 6
- article number
- 114612
- publisher
- Elsevier
- external identifiers
-
- scopus:85207573888
- ISSN
- 2213-3437
- DOI
- 10.1016/j.jece.2024.114612
- language
- English
- LU publication?
- yes
- id
- daf2aa9d-10a4-40c0-90d4-b382bab1540b
- date added to LUP
- 2024-12-04 09:45:58
- date last changed
- 2025-04-04 14:35:33
@article{daf2aa9d-10a4-40c0-90d4-b382bab1540b,
abstract = {{<p>The S-scheme mechanism in photocatalysis offers a promising approach to significantly enhance photoreductive activity. Here, using Bi dots as electronic media, and by changing the amount of added C@CuO on the surface of flower-shaped Bi<sub>2</sub>MoO<sub>6</sub>, a diverse range of CBM-x heterojunctions, were synthesized using a multi-step approach that incorporated solvothermal preparation and calcination methods. CBM-10 exhibited excellent photocatalytic activity: 96.9 % of Cr(VI) removal in 30 min, which was 38.0-fold better than CuO, 4.2-fold higher than pristine Bi<sub>2</sub>MoO<sub>6</sub>. Furthermore, even after five cycles of use, CBM-10 showed outstanding stability. Experiments to capture the active species revealed that electrons play a crucial role in the photocatalytic reduction of Cr(VI). In these heterojunctions, carbon doping leads to the formation of coatings on the semiconductor materials to promote the migration and separation of photogenerated carriers. The presence of carbon coating is beneficial to improve the stability of CBM-10. Bi dots grown on Bi<sub>2</sub>MoO<sub>6</sub> nanosheets can act as electron transport channels in C@CuO/Bi/Bi<sub>2</sub>MoO<sub>6</sub>, accelerate photoinduced carrier separation. The internal electric field, and the existence of “S-scheme” charge transfer mechanism was verified by the combination of atomic force microscope and synchronous illumination X-ray photoelectron spectroscopy. This process significantly mitigates the recombination of photo-induced carriers, enhancing the overall photoreduction efficacy. This study presents a novel method for developing S-scheme heterojunction to enhance the effectiveness of Cr(VI) decontamination, paves a promising route to heavy metal removal by mild photo-reductive system, and provides new insights into the design of photocatalysts with enhanced redox capabilities.</p>}},
author = {{Zhang, Luxin and Li, Qunshuai and Xing, Xu and Li, Yunfeng and Gao, Bo and Yu, Han}},
issn = {{2213-3437}},
keywords = {{C@CuO/Bi/Bi2MoO6; Cr(VI) reduction; S-scheme heterojunction; Visible-light photocatalysis; Wastewater treatment}},
language = {{eng}},
number = {{6}},
publisher = {{Elsevier}},
series = {{Journal of Environmental Chemical Engineering}},
title = {{Synergistic effects of carbon coating and Bi-bridge in S-scheme C@CuO/Bi/Bi<sub>2</sub>MoO<sub>6</sub> nanocomposites for enhanced photoreduction of Cr(VI)}},
url = {{http://dx.doi.org/10.1016/j.jece.2024.114612}},
doi = {{10.1016/j.jece.2024.114612}},
volume = {{12}},
year = {{2024}},
}