A series of novel Ag Cl/Ag_2CO_3 heterostructured photocatalysts with different Ag Cl contents(5 wt%,10 wt%, 20 wt%, and 30 wt%) were prepared by facile coprecipitation method at room temperature. The resulting products were characterized by powder X-ray diffraction(XRD), scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), and ultraviolet–visible diffuse reflectance spectroscopy(UV–Vis DRS), respectively. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of methyl orange(MO) under UV light irradiation. With the optimal Ag Cl content of 20 wt%, the Ag Cl/Ag_2CO_3 composite exhibits the greatest enhancement in photocatalytic degradation efficiency. Its first-order reaction rate constant(0.67 h-1) is5.2 times faster than that of Ag_2CO_3(0.13 h-1), and 16.8times faster than that of Ag Cl(0.04 h-1). The formation of Ag Cl/Ag_2CO_3 heterostructure could effectively suppress the recombination of the photo-generated electron and hole, resulting in an increase in photocatalytic activity.
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