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In this work, the lacunary Keggin-type phosphotungstates of [PW 9 O 34 ] 9- (PW 9 ) clusters were loaded onto the g-C 3 N 4 nanosheets (NSs) to synthesize the phosphotungstate clusters-decorated 2D heterojunction photocatalysts by using the electrostatic-force driven self-assembly process. The surface charge polarity of g-C 3 N 4 NSs was changed from a negative to a positive charge through the acidizing treatment. The positively-charged g-C 3 N 4 NSs allowed the negatively-charged PW 9 clusters to be adsorbed and deposited onto the g-C 3 N 4 NSs, forming the PW 9 /g-C 3 N 4 heterojunction NSs. The as-synthesized samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, and UV-VIS absorption spectra, respectively. The photocatalytic activity tests indicated that, upon simulated sunlight irradiation, the photocatalytic H 2 -generation rate of PW 9 /g-C 3 N 4 heterojunction NSs (~23.8 μmol h -1 ) was ~3.3 times higher than that of the pure g-C 3 N 4 NSs (~7.3 μmol h -1 ). The enhanced photocatalytic activity of PW 9 cluster-decorated g-C 3 N 4 NSs could be attributed to the enhanced separation process of the photoinduced charge-carriers, due to the Z-scheme-mediate charge transfer behavior across their hetero-interface.

Facile Synthesis of Lacunary Keggin-Type Phosphotungstates-Decorated g-C3N4 Nanosheets for Enhancing Photocatalytic H2 Generation