Journal
CHINESE JOURNAL OF CATALYSIS
Volume 42, Issue 4, Pages 627-636Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2067(20)63684-1
Keywords
Crystalline; Hollow spheres; Graphitic carbon nitride; Photocatalytic hydrogen evolution; Photocatalytic degradation; Plasticizer
Funding
- Natural Science Foundation of China [51672099, 21403079]
- Sichuan Science and Technology Program [2019JDRC0027]
- Fundamental Research Funds for the Central Universities [2017-QR-25]
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The highly crystalline g-C3N4 hollow spheres prepared by the molten salt method exhibit improved photocatalytic activity, repairing structural defects, enhancing energy utilization, and increasing active sites.
Graphitic carbon nitride (g-C3N4) has emerged as a remarkably promising photocatalyst for addressing environmental and energy issues; however, it exhibits only moderate photocatalytic activity because of its low specific surface area and high recombination of carriers. Preparation of crystalline g-C3N4 by the molten salt method has proven to be an effective method to improve the photocatalytic activity. However, crystalline g-C3N4 prepared by the conventional molten salt method exhibits a less regular morphology. Herein, highly crystalline g-C3N4 hollow spheres (CCNHS) were successfully prepared by the molten salt method using cyanuric acid-melamine as a precursor. The higher crystallization of the CCNHS samples not only repaired the structural defects at the surface of the CCNHS samples but also established a built-in electric field between heptazine-based g-C3N4 and triazine-based g-C3N4. The hollow structure improved the level of light energy utilization and increased the number of active sites for photocatalytic reactions. Because of the above characteristics, the as-prepared CCNHS samples simultaneously realized photocatalytic hydrogen evolution with the degradation of the plasticizer bisphenol A. This research offers a new perspective on the structural optimization of supramolecular self-assembly. (C) 2021, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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