Heterostructured Ag3PO4/AgBr/Ag plasmonic photocatalyst with enhanced photocatalytic activity and stability under visible light.
Heterostructured Ag3PO4/AgBr/Ag plasmonic photocatalyst with enhanced photocatalytic activity and stability under visible light.
复制标题
DOI：
10.1039/c3nr00191a
复制
发表时间：
2013-03
期刊：
影响因子：
6.7
通讯作者：
Wan Wang;H. Du;Rui-Xia Wang;T. Wen;A. Xu
中科院分区：
文献类型：
--
作者：
Wan Wang;H. Du;Rui-Xia Wang;T. Wen;A. Xu
通过Ag 3 PO 4微立方体与水溶液中的溴离子进行合理的原位离子交换反应，然后进行光还原，制备了异质结构的Ag 3 PO 4/AgBr/Ag等离子体光催化剂。在可见光（λ≥ 400 nm）照射下，以橙子（MO）和亚甲基蓝（MB）为目标染料，考察了所制备的光催化剂的光催化活性。与AgBr/Ag、Ag 3 PO 4/AgBr异质晶体和纯Ag 3 PO 4晶体相比，异质结构Ag 3 PO 4/AgBr/Ag等离子体光催化剂具有更高的光催化活性和稳定性。这种增强的光催化活性表明，异质结构的Ag 3 PO 4/AgBr/Ag和表面上的Ag纳米粒子的强SPR的协同作用，导致光催化活性的高效率和改善的稳定性。在Ag 3 PO 4/AgBr/Ag异质结构的辅助下，MO和MB分子在可见光照射下分别仅需8 min和12 min即可完全分解。此外，光降解速率在连续10个循环中没有显示出明显的下降，表明我们的异质结构Ag 3 PO 4/AgBr/Ag等离子体光催化剂在可见光照射下是非常稳定的。
A heterostructured Ag3PO4/AgBr/Ag plasmonic photocatalyst was prepared by a rational in situ ion exchange reaction between Ag3PO4 micro-cubes and Br(-) in aqueous solution followed by photoreduction. The photocatalytic activities of obtained photocatalysts were measured by the degradation of methyl orange (MO) and methylene blue (MB) under visible light irradiation (λ≥ 400 nm). Compared to AgBr/Ag, Ag3PO4/AgBr heterocrystals and pure Ag3PO4 crystals, the heterostructured Ag3PO4/AgBr/Ag plasmonic photocatalysts exhibit much higher photocatalytic activity and stability. This enhanced photocatalytic activity suggests that the synergetic effects of the heterostructured Ag3PO4/AgBr/Ag and the strong SPR of Ag NPs on the surface result in the high efficiencies of the photocatalytic activity and the improved stability. With the assistance of Ag3PO4/AgBr/Ag heterostructures, only 8 min and 12 min are taken to completely decompose MO and MB molecules under visible-light irradiation, respectively. Furthermore, the photodegradation rate does not show an obvious decrease during ten successive cycles, indicating that our heterostructured Ag3PO4/AgBr/Ag plasmonic photocatalysts are extremely stable under visible-light irradiation.