Abstract: Aseries of silver phosphate/graphite carbon nitride-diatomite composites were prepared through a impregnation-roasting-deposition method. Their structure, morphology and light absorption properties were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis-DRS). The photocatalytic activities and stability of samples were evaluated by degradation of Rhodamine B (RhB) under visible light irradiation. The results show that the as-prepared silver phosphate/graphite carbon nitride-diatomite composites exhibits excellent photocatalytic activity compared to silver phosphate/graphite carbon nitride, silver phosphate, and graphite carbon nitride, respectively. Besides, the effect of silver phosphate content on photocatalytic activity was systematically studied. The ca-talyst A/CD8/2 was found to exhibit the highest photocatalytic activity. The degradation rate of the A/CD8/2 to Rhodamine B was as high as 98.61% under the irradiation of visible light for 21 min. The degradation rate of the A/CD8/2 is 95% after recycling for three times, showing good stability and reusability. The improvement of photocatalytic activity was mainly attributed to the efficient separation of photogenerated electron-hole pairs in the silver phosphate/graphite carbon nitride-diatomite composites and the synergistic effect of adsorption/photocatalysis.
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2019, Vol. 33 
