Abstract
BackgroundThe construction of heterojunction photocatalysts with excellent redox ability is considered as an effective strategy to address refractory pollutants. MethodsThe novel Bi2Sn2O7/Ag/Ag3PO4 Z-scheme heterojunctions were designed and constructed by a hydrothermal combined precipitation method. The Ag3PO4 microspheres were simply precipitated and supported the nanoparticles Bi2Sn2O7, and then Ag+ cations on the surface were photoreduced to Ag0 nanoparticles anchored on the surface of Ag3PO4. Significant findingsUnder visible light irradiation, the catalyst 0.4-Bi2Sn2O7/Ag/Ag3PO4 with m(Bi2Sn2O7):m(Ag3PO4)= 0.4:1.0 mass ratio has the highest Rhodamine B degradation efficiency of 98.2% in 80 min, which is 8.3 and 4.2 folds higher than that of Bi2Sn2O7 and Ag3PO4, respectively. Besides, Bi2Sn2O7/Ag/Ag3PO4 possessed the effectively degradation of xylenol orange (XO) and Cr (Ⅵ). The results of the radical scavengers reveal that h+ and·O2− act as the main photocatalytic reactive specie. The photocatalytic mechanism over Z-scheme Bi2Sn2O7/Ag/Ag3PO4 has been proposed based on the experimental results together with the ultraviolet photoelectron spectroscopy (UPS) analysis and scavenger reactions.
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