Abstract：Ag/Ag1.69Sb2.27O6.25 photocatalytic nano-powders were synthesized by ion exchange method using K2H2Sb2O7·4H2O and AgNO3 as raw materials. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, ultraviolet diffuse reflectance and ultraviolet-visible-spectrophotometer were used to analyze and test the phase, morphology, structure and optical properties of the nano-powders obtained at different calcination temperatures. The photocatalytic properties of the nano-powders were measured by photodegradation experiments of tetracycline hydrochloride (TC-HCl) under visible light. The results show that the diameter of Ag/Ag1.69Sb2.27O6.25 particles is about 100-150 nm, and the surface of Ag1.69Sb2.27O6.25 is coated with spherical Ag particles with a size of 10 nm. With the increase of calcination temperature, the depression of Ag/ Ag1.69Sb2.27O6.25 nanoparticles becomes smaller, and the powder color changes from gray to yellow. The photocatalytic activity of Ag/ Ag1.69Sb2.27O6.25 nano-materials prepared at 250 ℃ is the highest, which is 7 times higher than that of the materials (Ag/ASO-250) prepared at 900 ℃. Moreover, the percentage of TC-HCl degradation by AgSbO3-ssr, N-TiO2 and Ag/ASO-250 is 65%, 77%, and 90% respectively when the photocatalytic degradation reaction lasts 90 minutes. This indicates that Ag/ASO-250 has strong photocatalytic activity compared with AgSbO3-ssr and N-TiO2.
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2019, Vol. 24 
