Hydrogen production with Ga2BiSbO7, Fe2BiSbO7 and Gd2BiSbO7 as photocatalysts under visible light irradiation
Hydrogen production with Ga2BiSbO7, Fe2BiSbO7 and Gd2BiSbO7 as photocatalysts under visible light irradiation
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DOI：
10.1016/j.ijhydene.2013.11.020
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发表时间：
2014-01
影响因子：
7.2
通讯作者：
Jingfei Luan;N. Guo;Biaohang Chen
中科院分区：
文献类型：
--
作者：
Jingfei Luan;N. Guo;Biaohang Chen
本文首次采用固相法合成了M2BiSbO7（M = Ga, Fe, Gd）作为新型光催化剂。报道了M2BiSbO7（M = Ga, Fe, Gd）的结构和光催化性能。结果表明：Ga2BiSbO7、fe2bisbo7和gd2bisbo7的结晶均为焦绿石型结构、立方晶系和空间群fd3m；Ga2BiSbO7、fe2bisbo7和gd2bisbo7的晶格参数分别为10.34804 Å、10.41030 Å和10.70353 Å。此外，ga2bisbo7和gd2bisbo7的带隙分别为1.955 eV和2.081 eV。在可见光照射下（波长> 420 nm），在CH3OH/H2O或AgNO3/H2O溶液中，以Ga2BiSbO7、fe2bisbo7或gd2bisbo7作为光催化剂，h2o2分别大量析出。结果表明，三种光催化剂的活性依次为Ga2BiSbO7> Fe2BiSbO7> Gd2BiSbO7。采用Ga2BiSbO7、fe2bisbo7或gd2bisbo7作为光催化剂，在不同的光照射（λ> 390 nm和λ> 0 nm）下，观察了甲醇水溶液的光催化过氧化反应。结果表明，光催化活性随入射波长（λ）的增加而降低。Pt、NiO或RuO2负载的Ga2BiSbO7、fe2bisbo7或gd2bisbo7 （λ> 420 nm）在可见光下进一步增强了光催化活性。Pt对Ga2BiSbO7、fe2bisbo7和Gd2BiSbO7光催化活性的提高效果优于NiO和ruo2。
M2BiSbO7(M = Ga, Fe, Gd) were synthesized by solid state reaction process for the first time as novel photocatalysts. The structural and photocatalytic properties of M2BiSbO7(M = Ga, Fe, Gd) were reported. The results showed that Ga2BiSbO7, Fe2BiSbO7and Gd2BiSbO7crystallized with the pyrochlore-type structure, cubic crystal system and space groupFd3m. The lattice parameter for Ga2BiSbO7,Fe2BiSbO7or Gd2BiSbO7was 10.34804 Å, 10.41030 Å or 10.70353 Å respectively. In addition, the band gaps of Ga2BiSbO7and Gd2BiSbO7were separately estimated to be 1.955 eV and 2.081 eV. For the photocatalytic water splitting reaction, H2or O2evolved abundantly with Ga2BiSbO7, Fe2BiSbO7or Gd2BiSbO7as photocatalyst from CH3OH/H2O or AgNO3/H2O solution respectively under visible light irradiation (Wavelength > 420 nm). The results indicated that the activities of three photocatalysts followed the order of Ga2BiSbO7> Fe2BiSbO7> Gd2BiSbO7. Moreover, photocatalytic H2evolution from aqueous methanol solution was observed with Ga2BiSbO7, Fe2BiSbO7or Gd2BiSbO7as photocatalyst under different light irradiation (λ> 390 nm andλ> 0 nm). The results showed that the photocatalytic activity decreased with increasing incident wavelength (λ). The photocatalytic activity was further enhanced under visible light irradiation with Ga2BiSbO7, Fe2BiSbO7or Gd2BiSbO7loaded by Pt, NiO or RuO2(λ> 420 nm). The effect of Pt was better than that of NiO or RuO2for improving the photocatalytic activity of Ga2BiSbO7, Fe2BiSbO7or Gd2BiSbO7.