Ag3PO4/CSs-x%(x=0-0.8,mass fraction),a series of photocatalysts,are synthesized through the coprecipitation of silver phosphate with carbon spheres(CSs)that are prepared by a hydrothermal method.The samples are characterized via X-ray diffraction(XRD),field emission scanning electron microscopy(FE-SEM),Fourier transform infrared spectroscopy(FT-IR),ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS)and X-ray photoelectron spectroscopy(XPS).It is indicated that Ag3PO4 has effectively been coated on the surface of CSs,and the crystal structure of Ag3PO4 has not been affected.Moreover,the addition of CSs enhances the absorption of Ag3PO4 to visible light and expands the contact surface area of Ag3PO4 with contaminants.Photocatalytic experiments show that Ag3PO4/CSs-x%(x=0.2-0.8)have higher photocatalytic activity than Ag3PO4.Ag3PO4/CSs-0.6%has the best photo-degradation performance when m(CSs)∶m(Ag3PO4)=0.6∶100.The degradation efficiency of phenol over Ag3PO4/CSs-0.6%can reach 99.4%after 60 min of light exposure.Holes(h+)and superoxide radical(·O2-)are the main active species.Meanwhile,good photocatalytic activity has been retained after the catalyst has experienced for three degradation cycles.
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