Synthesis, Regeneration and Photocatalytic Activity under Visible-Light Irradiation of Ag/Ag3PO4/g-C3N4 Hybrid Photocatalysts
Ag/Ag3PO4/g-C3N4 (g denotes graphitic) was synthesized via an anion-exchange precipitation method,and its photocatalytic activity under visible light and regeneration with H2O2 and NaNH4HPO4 were investigated.The structural characteristics were analyzed using X-ray diffraction (XRD),field-emission scanning electron microscopy (FESEM),ultraviolet-visible (UV-Vis) absorption spectroscopy,and X-ray photoelectron spectroscopy (XPS).The XRD results showed that the structure of the regenerated catalyst was unchanged.The FESEM and UV-Vis absorption spectroscopy results showed that the Ag/Ag3PO4/g-C3N4 catalyst was composed of Ag3PO4 and g-C3N4.XPS showed that a small amount of Ag particles were present on the catalyst surface.The photocatalytic activity was evaluated using phenol degradation under visible light (A ＞420 nm) and the photocatalytic mechanism was discussed based on the active species during the photocatalytic process and the band structure.Experimental studies showed that the photocatalytic activity of the as-prepared Ag/Ag3PO4/g-C3N4 was higher than those of pure Ag3PO4 and g-C3N4.The high photocatalytic performance of the Ag/Ag3PO4/g-C3N4 composite can be attributed to the synergistic effect ofAg3PO4,g-C3N4,and a small amount ofAg0.Regeneration using H2O2 and NaNH4HPO4· 4H2O fully restored the photoactivity of the catalyst,showing that this green regeneration method could make Ag/Ag3PO4/g-C3N4 an environmentally friendly catalyst for practical applications.
国家科技期刊平台
NSTL
万方数据
维普
