采用CTAB辅助水热法制备棒状单斜相BiPO4.通过光沉积在BiPO4表面负载MnOx纳米粒子,形成MnOx/BiPO4异质结.采用XRD、SEM、TEM、XPS、PL及UV-Vis等手段对样品进行表征.结果表明:当Mn/Bi摩尔比控制在较低水平时,MnOx纳米粒子牢固附着在BiPO4表面,形成具有有效界面的MnOx/BiPO4异质结.亚甲基蓝光降解实验结果表明,MnOx/BiPO4异质结相对BiPO4具有更高的光催化活性.这是因为异质结的形成,促进了界面电荷迁移,抑制了光生电子?空穴对的复合,从而获得更高的量子效率.而且MnOx/BiPO4异质结相对BiPO4在300~420 nm范围内具有更高的光吸收能力,这也有利于增强光催化活性.
Monoclinic BiPO4with rod-like shape was prepared via a CTAB-assisted hydrothermal route. MnOxnanoparticles were loaded on the surfaces of BiPO4 rods by a photo-deposition process to form MnOx/BiPO4 heterojunctions. The as-prepared samples were characterized by XRD, SEM, TEM, XPS, FL, and UV-Vis diffuse reflectance measurements. The results showed that MnOx nanoparticles were strongly anchored to the surfaces of BiPO4 rods when the mole ratio of Mn to Bi was controlled at a low level, forming MnOx/BiPO4heterojunctions with effective and sound interfaces. The MnOx/BiPO4heterojunctions exhibited higher photoactivity than pristine BiPO4 for photodegradation of methyl blue under UV irradiation, which could be attributed to the efficient charge transfer at the heterojunction interfaces. The higher light absorption ability of MnOx/BiPO4 in the range of 300?420 nm compared with pristine BiPO4 was also responsible for the enhanced photocatalytic activities of MnOx/BiPO4heterojunctions.
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