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Article

Boosting Visible-Light Photocatalytic Activity of BiOCl Nanosheets via Synergetic Effect of Oxygen Vacancy Engineering and Graphene Quantum Dots-Sensitization

by
Zisheng Shi
1,
Wei Chen
2,*,
Yin Hu
2,*,
Fen Zhang
2,
Lingling Wang
2,
Dan Zhou
1,
Xuanye Chen
2 and
Sugang Meng
3
1
School of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China
2
Research Institute of Applied Chemistry, Jiangxi Academy of Sciences, Nanchang 330096, China
3
Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, Huaibei Normal University, Huaibei 235000, China
*
Authors to whom correspondence should be addressed.
Molecules 2024, 29(6), 1362; https://doi.org/10.3390/molecules29061362
Submission received: 6 February 2024 / Revised: 14 March 2024 / Accepted: 15 March 2024 / Published: 19 March 2024
(This article belongs to the Special Issue Advanced Photocatalysts for Energy Conversion and Environmental Applications, 2nd Edition)
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Abstract

In recent years, oxygen vacancy (VO) engineering has become a research hotspot in the field of photocatalysis. Herein, an efficient GQDs/BiOCl-VO heterojunction photocatalyst was fabricated by loading graphene quantum dots (GQDs) onto BiOCl nanosheets containing oxygen vacancies. ESR and XPS characterizations confirmed the formation of oxygen vacancy. Combining experimental analysis and DFT calculations, it was found that oxygen vacancy promoted the chemical adsorption of O2, while GQDs accelerated electron transfer. Benefiting from the synergistic effect of oxygen vacancy, GQDs, and dye sensitization, the as-prepared GQDs/BiOCl-VO sample exhibited improved efficiency for RhB degradation under visible-light irradiation. A 2 wt% GQDs/BiOCl-VO composite effectively degraded 98% of RhB within 20 min. The main active species were proven to be hole (h+) and superoxide radical (·O2−) via ESR analysis and radical trapping experiments. This study provided new insights into the effective removal of organic pollutants from water by combining defect engineering and quantum dot doping techniques in heterojunction catalysts.
Keywords: graphene quantum dots (GQDs); oxygen vacancy (VO); bismuth oxychloride (BiOCl); synergistic effect; photocatalytic degradation graphene quantum dots (GQDs); oxygen vacancy (VO); bismuth oxychloride (BiOCl); synergistic effect; photocatalytic degradation

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MDPI and ACS Style

Shi, Z.; Chen, W.; Hu, Y.; Zhang, F.; Wang, L.; Zhou, D.; Chen, X.; Meng, S. Boosting Visible-Light Photocatalytic Activity of BiOCl Nanosheets via Synergetic Effect of Oxygen Vacancy Engineering and Graphene Quantum Dots-Sensitization. Molecules 2024, 29, 1362. https://doi.org/10.3390/molecules29061362

AMA Style

Shi Z, Chen W, Hu Y, Zhang F, Wang L, Zhou D, Chen X, Meng S. Boosting Visible-Light Photocatalytic Activity of BiOCl Nanosheets via Synergetic Effect of Oxygen Vacancy Engineering and Graphene Quantum Dots-Sensitization. Molecules. 2024; 29(6):1362. https://doi.org/10.3390/molecules29061362

Chicago/Turabian Style

Shi, Zisheng, Wei Chen, Yin Hu, Fen Zhang, Lingling Wang, Dan Zhou, Xuanye Chen, and Sugang Meng. 2024. "Boosting Visible-Light Photocatalytic Activity of BiOCl Nanosheets via Synergetic Effect of Oxygen Vacancy Engineering and Graphene Quantum Dots-Sensitization" Molecules 29, no. 6: 1362. https://doi.org/10.3390/molecules29061362

APA Style

Shi, Z., Chen, W., Hu, Y., Zhang, F., Wang, L., Zhou, D., Chen, X., & Meng, S. (2024). Boosting Visible-Light Photocatalytic Activity of BiOCl Nanosheets via Synergetic Effect of Oxygen Vacancy Engineering and Graphene Quantum Dots-Sensitization. Molecules, 29(6), 1362. https://doi.org/10.3390/molecules29061362

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