Journal
RSC ADVANCES
Volume 6, Issue 81, Pages 77760-77767Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra12915c
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Funding
- Natural Science Foundation of Hubei Province of China [2013CFA085]
- National Natural Science Foundation of China [51202064, 51472081]
- Research Foundation for Talented Scholars of Hubei University of Technology [BSQD12119]
- Open Foundation of Hubei Provincial Key Laboratory of Green Materials for Light Industry [[2013]2-22]
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A ternary composite photocatalyst CdS/Au/g-C3N4 was synthesized by a facile two-step photoreduction method. In this hybrid structure, CdS nanoparticles and CdS@Au core-shell nanoparticles are homogeneously deposited on the surface of g-C3N4 to produce two different structures CdS-g-C3N4 and CdS@Au-g-C3N4. The microstructure analysis results of the composition, chemical states, and optical properties of as-prepared ternary hybrid reveal that a strong interaction exists between CdS nanoparticles, CdS@Au nanoparticles and the g-C3N4 bulk. The ternary composite CdS/Au/g-C3N4 exhibits significantly enhanced photocatalytic activity for RhB degradation under visible light irradiation compared with the binary composites CdS/g-C3N4, Au/g-C3N4 and pure g-C3N4. Meanwhile, CdS/Au/g-C3N4 also demonstrates good photostability in the recycling test of RhB degradation. The active species in the photocatalytic reaction over CdS/Au/g-C3N4 are detected as O-2(center dot-) and h(+). The superior photocatalytic performance of CdS/Au/g-C3N4 should be attributed to the enhanced separation efficiency of photogenerated electrons-holes induced by the formed heterojunctions CdS-g-C3N4 and Z-scheme structure CdS@Au-g-C3N4 where Au nanoparticles serve as electrons mediator.
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