期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 163, 期 -, 页码 298-305出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2014.08.013
关键词
Photocatalysis; Heterojunction nanosheets; Charge transfer; Dyes; Phenols
资金
- 973 Program [2012CB626801]
- National Natural Science Foundation of China [11274057, 51402038, 11474046]
- Program for New Century Excellent Talents in University [NCET-13-0702]
- Scientific Research Foundation for Doctor of Liaoning Province [20141118]
- Science and Technology Project of Liaoning Province [2012222009]
- Program for Liaoning Excellent Talents in University (LNET) [LJQ2012112]
- Fundamental Research Funds for the Central Universities [DC12010117]
- Science and Technique Foundation of Dalian [2013A14GX040]
In this work, we present the 2D/2D type of heterojunction photocatalysts fabricated by horizontal loading ultrathin hexagonal SnS2 nanosheets on g-C3N4 nanosheets through a facile ultrasonic dispersion method. The sheet-like structures of these two nanomaterials induce a large contact region in the heterojunction interface, as evidenced by electron microscopic analyses. By taking advantage of this feature, the as-fabricated SnS2/g-C3N4 heterojunction nanosheets exhibit considerable improvement on the photocatalytic activities for the degradation of organic dyes and phenols under visible light irradiation as compared to pure g-C3N4 and SnS2 nanosheets. In particular, the optimal heterojunction nanosheet with 5.0 wt.% SnS2 shows the apparent rate constant of similar to 0.2 min(-1) for the RhB photodegradation, which is higher than that of pure g-C3N4 and SnS2 nanosheets by a factor of 4 and 8, respectively. Further studies by steady-state and transient photoluminescence spectroscopy indicate that the photosynergistic effect of SnS2/g-C3N4 heterojunction can remarkably enhance the photoinduced interfacial charge transfer, thereby increasing the charge separation during the photocatalytic reaction. (C) 2014 Elsevier B.V. All rights reserved.
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