Monodispersed Ag3PO4 nanocrystals loaded on the surface of spherical Bi2MoO6 with enhanced photocatalytic performance
Monodispersed Ag3PO4 nanocrystals loaded on the surface of spherical Bi2MoO6 with enhanced photocatalytic performance
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球形Bi2MoO6表面负载的单分散Ag3PO4纳米晶具有增强的光催化性能
DOI：
10.1039/c2dt31634j
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发表时间：
2013-01-01
影响因子：
4
通讯作者：
Zhang, Wei-De
中科院分区：
文献类型：
--
作者：
Xu, Yang-Sen;Zhang, Wei-De
以硝酸铋和钼酸铵为前驱体，通过溶剂热反应制备了尺寸为500 nm - 2 μm的球形Bi₂MoO₆纳米结构。然后通过一种简便的沉积 - 沉淀技术将Ag₃PO₄纳米粒子沉积到Bi₂MoO₆表面。光催化测试表明，在可见光下，Ag₃PO₄/Bi₂MoO₆纳米复合材料对罗丹明B和亚甲基蓝的降解速率比纯Ag₃PO₄纳米粒子和Bi₂MoO₆高得多。复合光催化剂的催化活性受Ag₃PO₄负载量的影响很大。负载50 mol% Ag₃PO₄的Bi₂MoO₆球在罗丹明B（RhB）和亚甲基蓝（MB）的脱色过程中均表现出最高的光催化活性。观察到的光催化活性的提高与Ag₃PO₄纳米粒子导致的在可见光区域的吸收增强以及Ag₃PO₄/Bi₂MoO₆界面处光生载流子的有效分离有关。此外，该复合材料可以通过沉降轻松回收，且稳定性没有任何损失。而且，自由基清除剂的测试证实，h⁺和·OH是降解罗丹明B的主要活性物种。
Spherical Bi2MoO6 nanoarchitectures with scale of 500 nm-2 mu m were prepared by a solvothermal reaction using bismuth nitrate and ammonium molybdate as precursors. Ag3PO4 nanoparticles were then deposited onto the surface of Bi2MoO6 via a facile deposition-precipitation technique. The photocatalytic tests display that the Ag3PO4/Bi2MoO6 nanocomposites possess a much higher rate for degradation of rhodamine B and methylene blue than the pure Ag3PO4 nanoparticles and Bi2MoO6 under visible light. The catalytic activity of the composite photocatalysts is greatly influenced by the loading level of Ag3PO4. The 50 mol% Ag3PO4-loaded Bi2MoO6 spheres exhibit the highest photocatalytic activity in both the decolorization of RhB and MB. The observed improvement in photocatalytic activity is associated with the extended absorption in the visible light region resulting from the Ag3PO4 nanoparticles, and the effective separation of photogenerated carriers at the Ag3PO4/Bi2MoO6 interfaces. In addition, the composite can be easily reclaimed by sedimentation without any loss of its stability. Moreover, the tests of radical scavengers confirmed that h(+) and (OH)-O-center dot were the main reactive species for the degradation of RhB.