以TiO_2为载体,采用双注法合成了AgBr/TiO_2复合光催化剂.利用X射线衍射仪(XRD)、紫外可见分光光度计(UV-Vis)和扫描电子显微镜(SEM)对AgBr/TiO_2的结构、光吸收、形貌进行了表征.研究了AgBr/TiO_2在可见光下对甲基橙和丁基罗丹明B的光催化活性.结果表明,与TiO_2相比,AgBr/TiO_2的光吸收范围拓展到400-600 nm波段,并且随着AgBr负载量的增加,AgBr/TiO_2的可见光吸收强度增强;当AgBr与TiO_2的摩尔比为0.25时,AgBr/TiO_2具有最大催化活性;在相同条件下,AgBr/TiO_2对丁基罗丹明B的降解效果优于甲基橙.
AgBr/TiO_2 composite photocatalyst was prepared by double-jet method using TiO_2 as sub-strate. The structure, light absorption and microscopy of AgBr/TiO_2 were respectively measured by X-ray diffraction (XRD), ultraviolet visible spectroscopy (UV-Vis) and scanning electron mi-croscopy (SEM). The photocatalytic activity of AgBr/TiO_2 for degradation of methyl orange (MO) and butyl rhodamine B (b-RhB) was studied under visible light irradiation. The results showed that the light absorption of AgBr/TiO_2 was broadened to 400-600 nm compared to TiO_2. With increas-ing the content of AgBr in AgBr/TiO_2, the light absorption intensity increased. AgBr/TiO_2 showed maximal photocatalytic activity when the molar ratio of AgBr to TiO_2 was 0.25. In addition, degra-dation efficiency of b-RhB with AgBr/TiO_2was higher than that of MO under the same condition.
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