Abstract
Photoreduction of CO2 into high-value chemicals is one of the promising strategies to mitigate CO2 emission and alleviate energy challenges, while the design and development of high-performance photocatalysts are recognized as the pivotal part. Herein, CdS-xAu catalysts with abundant S vacancies and Au nanoparticles were successfully synthesized via one-step γ-ray radiation method. The characterization results showed that the CdS-γ had smaller spherical particles compared to the CdS-H catalyst prepared by hydrothermal method, which was favorable for exposing more active sites. Besides, the Au was reduced by solvated electrons and anchored on the in situ generated S vacancies within CdS. By acting as the photogenerated electrons extractors, the generated Au nanoparticles synergized with S vacancies to promote the charge separation and inhibit the recombination of photogenerated carriers, thus enhancing the photocatalytic activities. Consequently, the CdS-2.5Au photocatalyst with appropriate loading amount presented the optimal performance for achieving the CO yield of 12.48 μmol g−1 h−1, which was superior to CdS-γ and even 2.8 times that of the hydrothermal synthesized CdS-H. This study provided new insights into the applications of γ-ray radiation in the preparation of high-performance photocatalytic materials.
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Funding
This work was supported by the National Natural Science Foundation of China (No. 21908092), the China Postdoctoral Science Foundation (No. 2022M711614), and the Jiangsu Funding Program for Excellent Postdoctoral Talent (No. 2022ZB194).
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Sun, T., Zhao, P., Zhou, Q. et al. γ-Radiation Induced Deposition of Au Nanoparticles on Defect-Rich CdS for Enhanced CO2 Photoreduction Under Visible Light. Water Air Soil Pollut 235, 172 (2024). https://doi.org/10.1007/s11270-024-06975-z
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DOI: https://doi.org/10.1007/s11270-024-06975-z