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Citation: Licheng Li, Kangzhong Shi, Rui Tu, Qi Qian, Dong Li, Zhuhong Yang, Xiaohua Lu. Black TiO2(B)/anatase bicrystalline TiO2-x nanofibers with enhanced photocatalytic performance[J]. Chinese Journal of Catalysis, ;2015, 36(11): 1943-1948. doi: 10.1016/S1872-2067(15)60946-9 shu

Black TiO2(B)/anatase bicrystalline TiO2-x nanofibers with enhanced photocatalytic performance

  • 1.

    a College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China;

  • Corresponding author: Licheng Li, 
  • Received Date: 24 April 2015
    Available Online: 3 July 2015

    Fund Project: 国家自然科学基金(21406118, 91434109, 91334202) (21406118, 91434109, 91334202) 南京林业大学高学历人才基金项目(GXL2014036) (GXL2014036) 科技副总(企业创新岗)特聘专家项目 (企业创新岗)

  • Black TiO2(B)/anatase bicrystalline TiO2-x nanofibers were synthesized from a porous titanate derivative by calcination in H2, and were characterized using field-emission scanning electron microscopy, Raman spectroscopy, N2 adsorption-desorption analysis, X-ray photoelectron spectroscopy, thermogravimetric analysis, ultraviolet-visible diffuse reflection spectroscopy and photoluminescence measurements. Characterization results showed that no Ti3+ was present on the surface of black bicrystalline TiO2-x and oxygen vacancies were distributed in the bulk of both TiO2(B) and anatase phases. The O/Ti atom stoichiometric ratio of black bicrystalline TiO2-x was estimated to be 1.97 from the difference of mass loss between black bicrystalline TiO2-x and white bicrystalline TiO2 without oxygen vacancies. The photocatalytic activity of black bicrystalline TiO2-x was 4.2 times higher than that of white bicrystalline TiO2 and 10.5 times higher than that of anatase TiO2. The high photocatalytic activity of black bicrystalline TiO2-x was attributed to its effective separation of electrons and holes, which may be related to the effects of both bicrystalline structure and oxygen vacancies. Black bicrystalline TiO2-x also exhibited good photocatalytic activity after recycling ten times. The black bicrystalline TiO2-x nanofibers show potential for use in environmental and energy applications.
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