期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 220, 期 -, 页码 607-614出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2017.08.086
关键词
Metal-organic frameworks; Graphitic carbon nitride; Z-scheme; Hydrogen evolution; Photocatalysis
资金
- NSF of China [51622806, 51378246, 51238002, 51272099]
- NSF of Jiangxi Province [20162BCB22017, 20165BCB18008, 20171ACB20017, 20133ACB21001, 20122BCB23013, 20114BAB203005]
- Opening Foundation of the Chinese National Engineering Research Center for Control and Treatment of Heavy metal Pollution [2015CNERC-CTHMP-02]
- Foundation of State Key Laboratory of Structural Chemistry [20100015]
- graduate student innovation fund of Jiangxi province [YC2016-S330]
- Brook Byers Institute for Sustainable Systems
- Hightower Chair
- Georgia Research Alliance at the Georgia Institute of Technology
To solve serious energy and environmental crises caused by rapid industrial development, the formation of Z-scheme heterostructured photocatalysts is a promising approach for efficient and scalable H-2 production from water splitting due to wide absorption range, high charge-separation efficiency and strong redox ability of the Z-scheme heterostructured photocatalysts. In this study, we combined the MOFs of NH2-MIL-125(Ti) with g-C3N4 functionalized by benzoic acid (CFB) to synthesize a novel composite catalyst of CFB/NH2-MIL-125(Ti) (CFBM) by covalent bonds for the first time. The benzoic acid in the CFBM acts as electron mediator to well separate photogenerated electrons and holes, leading to excellent photocatalytic performance of photocatalytic hydrogen generation from water splitting under visible light irradiation. Experimental results show that the H-2 production rate of the 10CFBM is 1.123 mmol.h(-1).g(-1), which is about 6 times of the NH2-MIL-125(Ti). Meanwhile, the simple physical mixture of NH2-MIL-125(Ti) with 10 wt% g-C3N4 and the 10wt% g-C3N4/MOFs heterostructured catalyst all show much smaller H-2 evolution rate and worse stability than that of the 10CFBM. Finally, we proposed a possible mechanism to well explain the improved photocatalytic performance of the Z-scheme photocatalytic system based on the results of different characterizations. The present work gives a good example to develop a novel Z-scheme heterostructured system with good stability and high photocatalytic activity for H-2 evolution and puts forward a new synthetic strategy to prepare metal-free semiconductor/MOFs formed by covalent bonds.
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