Photo-assisted synthesis of Ag3PO4/reduced graphene oxide/Ag heterostructure photocatalyst with enhanced photocatalytic activity and stability under visible light
Photo-assisted synthesis of Ag3PO4/reduced graphene oxide/Ag heterostructure photocatalyst with enhanced photocatalytic activity and stability under visible light
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DOI：
10.1016/j.apcatb.2014.04.007
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发表时间：
2014-10-01
影响因子：
22.1
通讯作者：
Yang, Yu
中科院分区：
文献类型：
--
作者：
Cui, Can;Wang, Yaping;Yang, Yu
首次采用光助还原法制备了Ag3PO4/还原石墨烯氧化物/银纳米晶(Ag3PO4/RGO/Ag)异质结光催化剂。Ag3PO4/RGO/Ag由RGO和Ag3PO4纳米颗粒之间紧密的化学键以及分散的等离子体银纳米晶组成，在可见光下对罗丹明B和苯酚的降解表现出比裸Ag3PO4、Ag/Ag3PO4和Ag3PO4/GO更好的光催化活性和稳定性。结果表明，Ag3PO4中的光生电子可以转移到RGO/Ag上，从而实现电子-空穴对的有效分离和转移。同时，在光照射下，等离子体银纳米晶还通过表面等离子体共振(SPR)产生电子-空穴对，其中的活性电子可以促进额外的O-2中心点(-)的光催化活性物种的形成，而空穴可以被来自RGO的电子填充。结果表明，由于异质结中Ag3PO4->；RGO->；Ag特殊的电子转移途径，抑制了Ag3PO4的光腐蚀和电子-空穴对的复合。这项工作表明，半导体和贵金属纳米晶修饰的石墨烯的合理结合可以为合成高效异质结构光催化剂提供一种通用的策略。(C)2014爱思唯尔B.V.保留所有权利。
A novel Ag3PO4/reduced graphene oxide/Ag nanocrystals (Ag3PO4/RGO/Ag) heterostructure photocatalyst has been synthesized using a facile photo-assisted reduction method for the first time. The Ag3PO4/RGO/Ag that consists of close chemical bonding between RGO and Ag3PO4 nanoparticles as well as dispersive plasmonic Ag nanocrystals on the RGO sheets exhibited superior photocatalytic activity and stability to bare Ag3PO4, Ag/Ag3PO4 and Ag3PO4/GO in degradation of Rhodamine B and phenol under visible light. It is suggested that the photo-generated electrons in Ag3PO4 can be transferred to RGO/Ag, leading to efficient separation and transfer of electron-hole pairs. Meanwhile, under light irradiation, the plasmonic Ag nanocrystals also generate electron-hole pairs through surface plasmon resonance (SPR), in which the active electrons can facilitate the formation of additional active species of O-2 center dot(-) for photocatalysis whereas the holes can be filled by electrons from RGO. As a result, both the photocorrosion of Ag3PO4 and the recombination of electron-hole pairs are suppressed due to the special electron transfer route of Ag3PO4 -> RGO -> Ag in the heterostructure. This work suggests that the reasonable combination of semiconductors and graphene decorated with noble metallic nanocrystals can provide a versatile strategy for the synthesis of high efficient heterostructed photocatalysts. (C) 2014 Elsevier B.V. All rights reserved.