Synthesis of KNbO3/g-C3N4 composite and its new application in photocatalytic H2 generation under visible light irradiation

被引:69
作者
Yu, Jinxiong [1 ]
Chen, Zhiqiang [1 ]
Wang, Yan [4 ]
Ma, Yuyin [1 ]
Feng, Zhe [1 ]
Lin, Hongjun [3 ]
Wu, Ying [2 ]
Zhao, Leihong [2 ]
He, Yiming [1 ]
机构
[1] Zhejiang Normal Univ, Dept Mat Sci & Engn, Jinhua 321004, Peoples R China
[2] Zhejiang Normal Univ, Inst Phys Chem, Jinhua 321004, Peoples R China
[3] Zhejiang Normal Univ, Coll Geog & Environm Sci, Jinhua 321004, Peoples R China
[4] Colorado Sch Mines, Dept Chem & Biol Engn, Golden, CO 80401 USA
关键词
ORGANIC POLLUTANTS; CARBON NITRIDE; DRIVEN PHOTOCATALYSTS; HYDROGEN GENERATION; WATER; DEGRADATION; TIO2; NANOCOMPOSITES; SOLAR; CO2;
D O I
10.1007/s10853-018-2119-5
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
High-performance KNbO3/g-C3N4 composite was prepared via a feasible method and first applied in photocatalytic H-2 production from water-methanol solution under irradiation of visible light. The structure and optical property of the synthesized composite were investigated by various techniques, including XRD, XPS, FT-IR, TEM, SEM, DRS, PL, and an electrochemical method. Results indicated that the combining of KNbO3 with g-C3N4 did not affect the optical absorption. However, strong interaction between the two semiconductors was observed, which promotes the fabrication of a heterojunction structure and subsequently improves the separation of photogenerated electrons and holes. Hence, KNbO3/g-C3N4 photocatalyst displayed obviously higher photoactivity than pristine g-C3N4. The photocatalytic hydrogen production rate for the optimal KNbO3/g-C3N4 composite (7.4 wt% KNbO3/g-C3N4) is 180 mu mol g(cat)(-1) h(-1), which is about 3.0 times that of pristine g-C3N4. Cycling tests further proved that KNbO3/g-C3N4 showed good photocatalytic stability. Additionally, the effect of hole sacrificial agent on the photocatalytic activity was also investigated. The KNbO3/g-C3N4 sample showed better performance in the presence of methanol than triethanolamine or EDTA-Na.
引用
收藏
页码:7453 / 7465
页数:13
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