Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 239, Issue -, Pages 525-536Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2018.08.049
Keywords
Core-shell structure; Z-scheme; Full-spectrum light response; Photocorrosion inhibition; Nitrogen-doped graphene quantum dots
Funding
- National Natural Science Foundation of China [51579096, 51521006, 51222805]
- Key Research and Development Program of Hunan Province of China [2017SK2241]
- National Program for Support of Top-Notch Young Professionals of China (2012)
- Hunan Province Cooperative Innovation Center for The Construction & Development of Dongting Lake Ecological Economic Zone
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It is a challenge to develop highly efficient and stable photocatalysts to harvest solar spectrum as broad as possible. In this work, for the first time, a nitrogen-doped graphene quantum dots (N-GQDs) modified Ag2CrO4@g-C3N4 core-shell structured composite was fabricated to achieve full-spectrum response from UV to near-infrared (NIR) region. In the Ag2CrO4/N-GQDs@g-C3N4 composites, Ag2CrO4 and g-C3N4 can be excited by UV and visible light, and N-GQDs can absorb NIR light to emit visible light, which greatly enhances the utilization of solar light. Moreover, compared with the normal hybrid heterojunctions, the core-shell structure provides larger contact area between Ag2CrO4 and g-C3N4. The large contact area and highly conductive N-GQDs effectively promote the photoelectron transfer from Ag2CrO4 to g-C3N4, which not only restrains the charge combination, but also greatly inhibits the photocorrosion of Ag2CrO4. The cycle experimental results showed that the performance of AN@CN did not decrease even after eight cycles of usage, and the XRD and EIS results also confirmed the stable nature of AN@CN composites. As a result, the optimized composites exhibit excellent photocatalytic degradation of doxycycline under full-spectrum light, and the possible photocatalytic mechanism was proposed. This work provides guidance for the design of high efficient photocatalysts with full-spectrum response and excellent stability.
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