Preparation, characterization, and photocatalytic activity of porous AgBr@Ag and AgBrI@Ag plasmonic photocatalysts

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• 作者：Fan Yang ; Baozhu Tian ; Jinlong Zhang ; Tianqing Xiong ; Tingting Wang
• 关键词：Porous AgBrI@Ag ; Surface plasmon resonance ; Dealloying method ; Photocatalytic degradation ; Methyl orange
• 刊名：Applied Surface Science
• 出版年：15 February, 2014
• 年：2014
• 卷：292
• 期：Complete
• 页码：256-261
• 全文大小：2552 K

文摘

Porous AgBr@Ag and AgBrI@Ag plasmonic photocatalysts were synthesized by a multistep route, including a dealloying method to prepare porous Ag, a transformation from Ag to AgBr and AgBrI, and a photo-reduction process to form Ag nanoparticles on the surface of AgBr and AgBrI. It was found that the porous structure kept unchanged during Ag was transferred into AgBr, AgBrI, AgBr@Ag, and AgBrI@Ag. Both porous AgBr@Ag and porous AgBrI@Ag showed much higher visible-light photocatalytic activity than cubic AgBr@Ag for the degradation of methyl orange, which is because the interconnected pore channels not only provide more reactive sites but also favor the transportation of photo-generated electrons and holes. For AgBrI@Ag, AgBrI solid solution formed at the interface of AgBr and AgI, and the phase junction can effectively separate the photo-generated electrons and holes, favorable to the improvement of photocatalytic activity. The optimal I content for obtaining the highest activity is 鈭?0 at.%.