Citation: Wanwan Meng, Ruisheng Hu, Jun Yang, Yanfei Du, Jingjia Li, Hongye Wang. Influence of lanthanum-doping on photocatalytic properties of BiFeO₃ for phenol degradation[J]. Chinese Journal of Catalysis, ;2016, 37(8): 1283-1292. doi: 10.1016/S1872-2067(16)62449-X shu

Influence of lanthanum-doping on photocatalytic properties of BiFeO₃ for phenol degradation

Key Laboratory of Rare Earth Materials Chemistry and Physics, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, Inner Mongolia, China

Received Date: 21 January 2016
Revised Date: 23 April 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21166015).

A series of BiFeO₃ and lanthanum-doped BiFeO₃ photocatalysts were synthesized by a facile sol-gel method using citric acid as complexing agent, and used to remove phenol in industrial wastewater under simulated sunlight irradiation. The samples were characterized by X-ray diffraction, energy dispersive spectroscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The introduction of La effectively suppressed the generation of an impurity phase. All the metals (La, Bi and Fe) are well distributed. Under simulated sunlight irradiation, the La-doped BiFeO₃ photocatalysts exhibited superior photocatalytic activity to pure BiFeO₃. The 15% La-doped BiFeO₃ photocatalyst exhibited the best activity, with a degradation rate of 96% and COD removal rate of 81.53% after irradiation for 180 min, and it showed good recycling stability. The enhanced photocatalytic ability of 15% La-doped BiFeO₃ was attributed to the increase of adsorbed surface hydroxyl groups, enhancement of visible light absorption and reduction of electron-hole recombination. We confirmed that the primary active species was ^·OH by adding different scavengers during the photodegradation of phenol and proposed a reaction mechanism based on these experiments.
- Sol-gel method,
- La-doping,
- Bismuth ferrite,
- Photocatalysis,
- Phenol
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Influence of lanthanum-doping on photocatalytic properties of BiFeO3 for phenol degradation

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Influence of lanthanum-doping on photocatalytic properties of BiFeO₃ for phenol degradation