期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 3, 页码 3187-3195出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b03305
关键词
Photocatalysis; Graphitic carbon nitride; Hierarchical structures; Defects; Molecular rearrangement
资金
- National Natural Science Foundation of China [21304101]
The catalytic performance of graphitic carbon nitride (g-C3N4) is significantly affected by its microstructure and intrinsic defects. Here, rodlike g-C3N4 (RCN) with hierarchical structure and fewer defects is fabricated through an ultrasound-assisted molecular rearrangement strategy. Rodlike supramolecular precursors are formed by rearrangement of melem through ultrasound in water. Heating the precursors at 550 degrees C leads to less defective hierarchical g-C3N4 composed of nanosheets. No expensive or hazardous reagent is involved in this process. The decrease in defects has been confirmed by powder X-ray diffraction, Fourier transform infrared, and X-ray photoelectron spectroscopy. The special hierarchical structure provides RCN with significantly increased surface area and enhanced efficiency of light harvesting. The decrease in defects broadens the visible-light responsive range, suppresses the recombination of electron hole pairs, and enhances the electric conductivity. The visible-light photocatalytic activities of RCN for RhB degradation and H-2 evolution increase 16.7- and 8.7-times, respectively, compared to that of bulk g-C3N4 prepared by directly heating melamine.
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