伪-Fe₂O₃/Pt hybrid nanorings and their enhanced photocatalytic activities

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• 作者：Hanfeng Liang ; Xinde Jiang ; Wei Chen ; Shiqiang Wang ; Binbin Xu ; Zhoucheng Wang
• 关键词：B. Nanocomposites ; D. Transition metal oxides ; 伪-Fe2O3 ; Pt ; Photocatalysis
• 刊名：Ceramics International
• 出版年：May, 2014
• 年：2014
• 卷：40
• 期：4
• 页码：5653-5658
• 全文大小：2083 K

文摘

In this paper, 伪-Fe₂O₃ nanorings were synthesized and used as a support to further synthesize hybrid Pt/伪-Fe₂O₃ nanorings. Transmission electron microscopy (TEM) analyses clearly suggest that Pt nanoparticles are deposited on the surface of 伪-Fe₂O₃ nanorings in a well-dispersed state. This metal-semiconductor hybrid system is expected to show high photocatalytic activity towards the degradation of environmental pollutants. Because of the Schottky contact between semiconductor and metal particles, the holes prefer to localize in energetically lower semiconductor, whereas the electrons can move through the heterointerface. This interfacial charge transfer and separation facilitate the redox reactions, results in a high photocatalytic activity. In our case, the as obtained 伪-Fe₂O₃/Pt hybrids exhibit enhanced photocatalytic performance with a degradation rate of 86.7% for methyl orange, which is much higher than that of pure 伪-Fe₂O₃ (33.2%).