采用简易离子交换法制备可见光驱动Ag3PO4光催化剂。通过X射线衍射、场发射扫描电子显微镜、N2吸附-脱附、紫外-可见漫反射光谱及傅里叶变换红外光谱对所制备的Ag3PO4催化剂进行表征。结果表明，在可见光照射下， Ag3PO4催化剂对罗丹明B降解表现出优越的光催化活性，但对甲基橙的降解活性低，这归因于Ag3PO4催化剂对甲基橙分子吸附量低。可见光照Ag3PO4反应体系中，空穴和超氧自由基共同发挥作用导致罗丹明B和甲基橙光催化降解。在罗丹明B的协助作用下， Ag3PO4催化剂对甲基橙的可见光催化降解活性大大增强，这是由于罗丹明B的存在可产生更多的超氧自由基，从而使甲基橙进一步降解。
A visible-light-driven Ag3PO4 catalyst was successfully synthesized by a facile ion-exchange route. The as-synthesized Ag3PO4 was characterized by X-Ray diffraction (XRD), field-emission scanning electron microscopy, N2 adsorption-desorption, UV-Vis diffuse reflectance spectroscopy and Fourier transform infrared spectroscopy. Under visible light irradiation, the Ag3PO4 catalyst showed excel-lent photocatalytic activity for rhodamine (RhB) degradation, but was poor at degrading methyl orange (MO) because of lower adsorption of MO molecules onto the surface of the Ag3PO4. The pho-todegradation of RhB and MO was achieved by holes and O2?-radical attack in the Ag3PO4 suspen-sion. The photodegradation of MO over the Ag3PO4 catalyst was greatly enhanced in the presence of RhB owing to greater production of O2?-radicals.
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