【摘要】 采用水热法制备了三维分级球形结构的Bi₂WO₆,在此基础上采用沉淀-沉积法将Ag₃PO₄量子点（QDs）沉积在Bi₂WO₆的表面,成功获得Ag₃PO₄/Bi₂WO₆异质复合材料光催化剂。借助XRD、FE-SEM、TEM、UV-Vis-DRS等技术对所得Ag₃PO₄/Bi₂WO₆异质复合材料光吸收性能、形貌和组成进行了系统表征,并以次甲基蓝（MB）和苯酚（Ph）的光催化降解为探针反应,探讨了Ag₃PO₄QDs表面沉积对Bi₂WO₆光催化性能的影响。结果表明,尺寸约为10 nm左右的Ag₃PO₄QDs均匀的沉积在Bi₂WO₆的表面,二者形成新颖的Ag₃PO₄/Bi₂WO₆异质结构。活性实验结果表明,与纯Bi₂WO₆相比异质催化剂的活性显著增强,当Ag₃PO₄与Bi₂WO₆复合比为1:1时催化活性最高,其降解Ph的表观速率常数(kapp/min^-1)约为纯Bi₂WO₆的7倍。更多还原

【Abstract】 Three-dimensional（ 3D） hierarchical bismuth tungstate（ Bi₂WO₆） was synthesized via a hydrothermal process.Ag₃PO₄ quantum dots（ QDs） were subsequently deposited on the surface of Bi₂WO₆ through a precipitation-deposition process.Ag₃PO₄/Bi₂WO₆ heterostructure composite was successfully obtained. XRD, FE-SEM, TEM, EDS and UV-Vis-DRS techniques were applied to characterize the phase composition,morphology and light absorptive properties of as-prepared samples. The photodegradation of methylene blue（ MB） and phenol（ Ph） were employed as probe reaction to investigate the effect of Ag₃PO₄ QDs deposition on the photocatalytic activity of Bi₂WO₆. The results reveals that Ag₃PO₄ QDs with the size of about 10 nm was monodispersed on the surface of Bi₂WO₆,which resulted in the formation of novel Ag₃PO₄/Bi₂WO₆ heterostructure. The photocatalytic activity results indicated that the as-synthesized series Ag₃PO₄/Bi₂WO₆ exhibits the enhanced photocataytic activity than that of pure-Bi₂WO₆. Moreover,when molar ratio of Ag₃PO₄ and Bi₂WO₆ equal to 1:1,the resulted 1:1 Ag₃PO₄/Bi₂WO₆ shows the optimal activity with a apparent rate constant( kapp/min^-1) as high as seven times of pure-Bi₂WO₆ for photodegradation of phenol.更多还原