Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (2): 536-542.doi: 10.3866/PKU.WHXB201511103

• ARTICLE • Previous Articles     Next Articles

Synthesis and Photocatalytic Activities of Rare Earth-Boron Co-Doped Slice Layer TiO2

Rui-Fen WANG1,2,*(),Fu-Ming WANG2,Jin-Ling SONG1,Sheng-Li AN1,2,Xin WANG1   

  1. 1 School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia Autonomous Region, P. R. China
    2 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
  • Received:2015-07-07 Published:2016-01-30
  • Contact: Rui-Fen WANG E-mail:jery19810528@126.com
  • Supported by:
    the National Natural Science Foundation of China(21407084);Natural Science Foundation of Inner Mongolia, China(2015MS0571);Higher School Foundation from Education Department of Inner Mongolia, China(NJZY13141)

Abstract:

Rare earth (RE) and B co-doped (RE-B) nano-TiO2 photocatalysts were prepared through a sol-gel method using tetrabutyl titanate, lanthanum nitrate, cerous nitrate, and boric acid. The phase constitution, surface morphology, surface elemental compositions, light responsivity, the band gap and the composite of the electronic hole of catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) and ultraviolet-visible spectroscopy (UV-Vis). The results show that all the doped products were anatase TiO2, and RE-B doping generates large lattice distortion and had the function of refining the grain, with the grain size decreasing from 27 nm (TiO2) to 10 nm (La-B-TiO2). The doped TiO2 was flake structure and piled up irregularly. Co-doping enhanced the absorption in the visible region and narrowed the band gap simultaneously. The absorption edge of La-B-TiO2 moved from 405 nm to 466 nm, and the band gap decreased 0.4 eV correspondingly. XPS results show that the doping elements have effectively doped into the titanium dioxide, and PL spectra show that the co-doping can effectively extend the life of the carrier. The photocatalytic activities of the samples were estimated by degrading methylene blue (MB) under visible and ultraviolet light irradiation for 2 h, and show much improved catalytic activity compared to un-doped TiO2. The degradation rate of MB using La/B-TiO2 was 80.67% under ultraviolet light, which is about 2.7 times that of un-doped TiO2, and 74.78 % under visible light.

Key words: Sol-gel method, RE-B co-doping, TiO2, MB, Photo-degradation

MSC2000: 

  • O643.3