Citation: JIAO Yanchao, ZHU Mingfeng, CHEN Feng, ZHANG Jinlong. La-doped titaniananocrystals with superior photocatalytic activity prepared by hydrothermal method[J]. Chinese Journal of Catalysis, ;2013, 34(3): 585-592. doi: 10.1016/S1872-2067(11)60483-X shu

La-doped titaniananocrystals with superior photocatalytic activity prepared by hydrothermal method

1.
Key Laboratory for Advanced Materials and Institute of Fine Chemicals, EastChinaUniversity of Science and Technology, Shanghai 200237, China

Corresponding author: CHEN Feng,
Received Date: 15 October 2012
Available Online: 10 November 2012
Fund Project: 国家自然科学基金(20777015) (20777015) 上海市教委科研创新项目(13ZZ042). (13ZZ042)

Potassium titanate (KTO) nanobars were synthesized by a hydrothermal method and used as a precursor to synthesize TiO₂ nanocrystals. La doping of the TiO₂ nanocrystals was achieved by introducing La³⁺ into the hydrothermal media. The hydrothermal transition of KTO to TiO₂ was investigated under various conditions,finding that the pH of the hydrothermal media, the temperature, and the pre-treating procedure play important roles in the phase transition. X-ray diffraction and transmission electron microscopywere used to characterize the crystal phase and morphology of the samples and the transition process of the hydrothermal reaction. The content of La³⁺ in the samples was measured by inductively coupled plasma atomic emission spectroscopy. The photocatalytic activity of the La-doped TiO₂(LaT) was measured under UV light with the degradation of methyl orange (MO, 10 mg/L).The results showed that the photocatalytic activity of TiO₂ was enhanced remarkably by La-doping. LaT hydrothermally prepared with 0.15 mol/L La³⁺at under 180℃ showedthe optimal reaction constant of 0.11 min^-1 for the degradation of MO, about 9.20 and 3.69 times than those of bare TiO₂ and P25, respectively.
- Potassium octatitanate,
- Phase transition,
- La-doped titania,
- Photocatalytic activity,
- Hydrothermal synthesis
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沈阳化工大学材料科学与工程学院沈阳 110142