期刊
CHEMICAL ENGINEERING JOURNAL
卷 316, 期 -, 页码 461-470出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.01.124
关键词
Z-scheme photocatalyst; 2/4-Dibromophenol; Debromination; Electron mediator; Carbon nanotubes
资金
- National Natural Science Foundation of China [51678323, 21307065]
- Special Fund for Agroscientific Research in the Public Interest [201503107]
- Natural Science Foundation of Shandong Province [ZR2011EL044, BS2012HZ005]
- Key Program of Qingdao Agricultural University [6610903]
An artificial all-solid-state Z-scheme Bi2MoO6/CNTs/g-C3N4 composite has been synthesized by hydrothermal technique, and its photocatalytic properties was investigated by the debromination and degradation of 2,4-dibromophenol (2,4-DBP). The morphology and surface analysis indicated that the Bi2MoO6/CNTs/g-C3N4 composite was a veritable ternary heterojunction rather than a simply physical mixture. The CNTs acted as excellent electron mediator for charge transfer due to the matched Fermi level between the Bi2MoO6 and g-C3N4. The unique Z-scheme structure had a remarkable contribution to affect the recombination of the electrons and holes. The optimal Bi2MoO6/CNTs/g-C3N4 composite exhibited an outstanding photocatalytic activity than the pure Bi2MoO6 and g-C3N4 for the debromination and degradation of 2,4-DBP. The photoexcited electrons aggregated in the g-C3N4 conduction band, and the holes in the Bi2MoO6 valence band have played equally important roles in the 2,4-DBP degradation. Debromination was the primary step for 2,4-DBP degradation, and the debromination process was launched by the photoexcited electrons aggregated in the g-C3N4 conduction band. The major intermediates during the debromination process were monobrominated and bromine-free products. Finally, the intermediates were mineralized by the photoexcited holes and the subsequent hydroxyl radicals. (C) 2017 Elsevier B.V. All rights reserved.
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