Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 183, Issue -, Pages 54-65Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2017.04.005
Keywords
Visible-light photocatalysis; beta-Naphthol; g-C3N4; Bi2MoO6; Carbon film
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Funding
- National Natural Science Foundation of China [51678323, 21307065]
- Special Fund for Agroscientific Research in the Public Interest [201503107]
- Natural Science Foundation of Shandong Province [BS2012HZ005]
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A novel ternary g-C3N4/C@Bi2MoO6 composite photocatalyst was prepared by a hydrothermal deposition method. Beta naphthol (beta-naphthol) was effectively degraded over g-C3N4/C@Bi2MoO6 composite under visible-light irradiation. The improved photocatalytic activity could be attributed to the efficient separation of photogenerated electrons and holes through the Z-scheme construction of g-C3N4/C@Bi2MoO6. Carbon film acted as an electron mediator to form the charge transmission-bridge between Bi2MoO6 and g-C3N4, which provided sufficient contact area and strong combination between the semiconductors and the electron mediators. The optimized Z-scheme 10%g-C3N4/C@Bi2MoO6 composite showed the highest photocatalytic activity. A possible photocatalytic mechanism of g-C3N4/C@Bi2MoO6 was proposed by a trapping experiment, which could be ascribed to the oxidizing ability of the generated holes and light absorption as well as the reduced the electron-hole pairs recombination with the presence of g-C3N4 and carbon in the composites. The photogenerated holes in the valence band of Bi2MoO6 were the major species in the 3-naphthol photocatalytic degradation process, and the accumulating electrons in the conduction band of g-C3N4 could capture the molecular oxygen to form superoxide radicals to decompose beta naphthol. (C) 2017 Elsevier B.V. All rights reserved.
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