Abstract: The oxygen-phosphorus co-doped two-dimensional graphitic carbon nitrides (g-C3N4), differing in the adding amount of ammonium phosphate, were prepared by supramolecular self-assembly and thermal polymerization, and were characterized by means of XRD, FTIR, XPS, SEM, TEM, UV-vis, photoluminescent spectroscopy, BET N2 adsorption-desorption, and electrochemical impedance spectrometry. The photocatalytic activities of the samples were also estimated by catalyzing rhodamine B (RhB) degradation under visible light irradiation. The results showed that the co-doping of oxygen-phosphorus into g-C3N4 led to the morphology transformation from one-dimensional tubes to two-dimensional stacked sheets, the narrowing of forbidden band width, the improvement in electron-hole pairs separation efficiency, and consequently, the enhancement of photocatalytic performance. The synergistic effect of the three active groups -·O2-, ·OH, and h+- resulted in the RhB degradation rate of 92.11% at initial state and of above 85% after 5-time reuse in photocatalytic performance test, which indicated a good stability. Especially, one of the prepared samples achieved a rate constant of photocatalyzed RhB degradation of 0.016 60 min-1, which was 12.39 times and 4.54 times higher than those of the pure g-C3N4 and of the g-C3N4 prepared by melamine-ammonium oxalate supramolecular precursor system, respectively.
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2024, Vol. 38 
