期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 244, 期 -, 页码 262-271出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2018.11.054
关键词
g-C3N4 NPs; Narrowed bandgap; Hydroxyl; Photocatalysis; Hydrogen
资金
- NSFC [21574018, 51433003, 251725204, 51572179, 21471106, 21771132, 21501126]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- Natural Science Foundation of Jiangsu Province [BK20161216]
- Jilin Provincial Education Department [543]
- Jilin Provincial Key Laboratory of Advanced Energy Materials (Northeast Normal University)
Zero-dimensional graphitic carbon nitride nanoparticles (OD g-C3N4 NPs) possess the advantages of non-toxicity, metal-free, and rich surface catalytic active sites. However, the complex preparation process, wide bandgap structure, easily particle aggregation and rapid carriers' recombination still limit their development in photo-catalysis. Herein, these issues are addressed by synthesizing a novel hydroxyl (-OH) modified g-C3N4 NPs with a simple hydrothermal method without using any etching agents. Besides the high hydrophily and small particle size, the -OH decorated OD g-C3N4 NPs possess obvious narrowed bandgap and high reduction potential. To further improve their dispersity and carriers' separation rate, 0D/3D g-C3N4 NPs/ZnS type II heterojunction is fabricated, which simultaneously improves the hydrophily, passivates the surface defects and extends the sunlight absorption range of ZnS. As a result, a high and cyclable photocatalytic activity of 112 mu mol h(-1) (5.6 mmol h(-1) g(-1)) is achieved under visible light irradiation without any co-catalysts, which is 140 times higher than that of pure ZnS and much better than the pure OD g-C3N4 NPs. A systematic study of photocatalytic mechanism is proposed by combining the theoretical calculations and experimental results. This work offers a new sight for the design of OD g-C3N4 NPs based photocatalysts for H-2 production.
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