Significant enhancement in the visible light photocatalytic properties of BiFeO3-graphene nanohybrids
Significant enhancement in the visible light photocatalytic properties of BiFeO3-graphene nanohybrids
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BiFeO3-石墨烯纳米杂化物的可见光光催化性能显着增强
DOI：
10.1039/c2ta00141a
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Nan, Wen
中科院分区：
文献类型：
--
作者：
Li, Zhuoxuan;Shen, Yang;Nan, Wen
由于石墨烯的高电荷迁移率以及较低的电子空穴对复合率，近年来基于石墨烯的可见光光催化剂得到了积极的研究。带隙在可见光范围内的 BiFeO3 被认为是氧化物光催化剂的有前途的候选者。在这篇论文中，BiFeO3-石墨烯纳米杂化物是通过简单的水热处理制备的。 BiFeO3 的形貌和能带结构受石墨烯的调节。成功合成了均匀装饰在石墨烯纳米片上的尺寸约为100 nm的BiFeO3纳米晶的纳米杂化物，其带隙约为1.78 eV。 BiFeO3 和石墨烯之间的化学键合通过 XPS 分析进行表征。 BiFeO3-石墨烯纳米杂化物显着增强了可见光光催化性能。刚果红在可见光下的光降解速率是 BiFeO3 颗粒的六倍，这归因于调制带隙和 BiFeO3 与石墨烯之间共价键的综合作用。
Graphene-based visible light photocatalysts have been actively pursued in recent years due to the high charge mobility of graphene and hence, the lower recombination rate of electron-hole pairs. BiFeO3 with a band gap in the visible range is considered a promising candidate as an oxide photocatalyst. In this contribution, BiFeO3-graphene nanohybrids are fabricated via facile hydrothermal treatments. The morphology and band structure of BiFeO3 are modulated by graphene. Nanohybrids with BiFeO3 nanocrystallites of similar to 100 nm uniformly decorated on graphene nanosheets are successfully synthesized, which exhibit a band gap of similar to 1.78 eV. Chemical bonding between BiFeO3 and graphene is characterized by XPS analysis. Significant enhancement in the visible light photocatalytic performance is achieved in the BiFeO3-graphene nanohybrids. The rate for the photo-degradation of Congo Red under visible light is six times that for BiFeO3 particles, which is attributed to the combined effects of modulated band gap and covalent bonding between BiFeO3 and graphene.