Abstract: We synthesized visible light catalyst Ag₃PO₄ under different temperatures in the hydrothermal reaction system. It was characterized by Xray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrum (FTIR), and the photodegradation experiments were carried out. The results show that with the increase of the hydrothermal reaction temperature, the partical size of Ag₃PO₄  increases gradually, and the morphology tends to rule; when the temperature is 110 ℃, a small amount of Ag₃PO₄ primitives are found on the surface of the photocatalyst Ag₃PO₄ , and the surface primitives increase with the increase of temperature; efficiency of Ag₃PO₄ degradation of  cationic dye—rhodamine B (RhB) is higher than that of degrading anionicdye—methyl orange (MO); the degradation rate of 180-APO is the highest after 20 min exposure to visible light, and the degradation rates of MO and RhB are 96.45% and 99.73%, respectively; the hole positive ions h⁺ and superoxide anion ·O^-₂ are the main active groups in the catalytic system.

Key words: temperature, silver phosphate, photocatalysis, hydrothermal method, morphology