Highly efficient photocatalytic H sub(2) evolution from water over CdLa sub(2)S sub(4)/mesoporous g-C sub(3)N sub(4) hybrids under visible light irradiation

In this study, mesoporous graphitic carbon nitride (mpg-C sub(3)N sub(4)) nanosheets with high surface area (317 m super(2) g super(-1)) were obtained by using SBA-15 as a hard-template, and CdLa sub(2)S sub(4) nanoparticles were successfully grown on these mpg-C sub(3)N sub(4) nanosheets via a faci...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2016-09, Vol.192, p.234-241
Main Authors: Liu, Hong, Xu, Zhengzheng, Zhang, Zhe, Ao, Dan
Format: Article
Language:English
Subjects:
Evolution
Nanostructure
Photocatalysis
Photoelectric effect
Spectroscopy
Transmission electron microscopy
X-ray photoelectron spectroscopy
X-rays
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Summary:In this study, mesoporous graphitic carbon nitride (mpg-C sub(3)N sub(4)) nanosheets with high surface area (317 m super(2) g super(-1)) were obtained by using SBA-15 as a hard-template, and CdLa sub(2)S sub(4) nanoparticles were successfully grown on these mpg-C sub(3)N sub(4) nanosheets via a facile hydrothermal method. The as-synthesized CdLa sub(2)S sub(4)/mpg-C sub(3)N sub(4) hybrids were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microcopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), N sub(2) adsorption-desorption, ultraviolet-visible diffuse reflection spectroscopy (DRS). Compared with pure CdLa sub(2)S sub(4), the CdLa sub(2)S sub(4)/mpg-C sub(3)N sub(4) hybrid materials displayed higher photocatalytic H sub(2) evolution performance under the visible light ( lambda > 420 nm) using Na sub(2)S and Na sub(2)SO sub(3) as the sacrificial agent. The optimal content of mpg-C sub(3)N sub(4) was about 20 wt% and the corresponding photocatalytic H sub(2) evolution was 5984.8 mu mol h super(-1) g super(-1) (with an apparent quantum efficiency of 7.1% at 420 nm), which was 7.7 times higher than that of pure CdLa sub(2)S sub(4). The results of photoluminescence (PL) and photocurrent response demonstrated that the recombination of photo-generated electron-hole pairs was effectively inhibited due to the well-matched band structure and intimate contact interfaces of CdLa sub(2)S sub(4) and mpg-C sub(3)N sub(4). Based on the results and analysis, a possible enhanced photocatalytic activity mechanism of CdLa sub(2)S sub(4)/mpg-C sub(3)N sub(4) composites was also proposed.
ISSN:0926-3373
DOI:10.1016/j.apcatb.2016.03.074