[an error occurred while processing this directive]

高等学校化学研究 ›› 2005, Vol. 21 ›› Issue (1): 48-52.

• Articles • 上一篇    下一篇

Properties of TiO2-SiO2 Mixed Oxides and Photocatalytic Oxidation of Heptane and Sulfur Dioxide

XIE Chao, XU Zi-li, YANG Qiu-jing, LI Na, WANG De-bao, DU Yao-guo   

  1. College of Environment and Resources, Jilin University, Changchun 130023, P. R. China
  • 收稿日期:2004-02-28 出版日期:2005-01-24 发布日期:2011-07-27
  • 基金资助:

    Supported by the National Natural Science Foundation of China(No.20277015).

Properties of TiO2-SiO2 Mixed Oxides and Photocatalytic Oxidation of Heptane and Sulfur Dioxide

XIE Chao, XU Zi-li, YANG Qiu-jing, LI Na, WANG De-bao, DU Yao-guo   

  1. College of Environment and Resources, Jilin University, Changchun 130023, P. R. China
  • Received:2004-02-28 Online:2005-01-24 Published:2011-07-27

PDF (PC)

摘要： A series of TiO2-XSiO2[X denotes the molar fraction(%) of silica in the mixed oxides] with different n(Ti)/n(Si) ratios was prepared with ammonia water as a hydrolysis catalyst.The photocatalysts prepared were characterized by XRD, thermal analysis, FTIR, UV-Vis and SPS.The characterization results of FTIR and UV-Vis spectra show that Ti atoms were gradually changed from octahedral coordination to tetrahedral coordination with the addition of silica, which is not beneficial for obtaining strong Brnsted acidity and higher photocatalytic activity.The photocatalytic activity experiments, which were conducted by using heptane(or SO2) as the model reactant, showed that TiO2-SiO2 containing a suitable amount of silica can exhibit much higher photocatalytic activity than pure TiO2.The enhanced photocatalytic activity can be attributed to three following factors: (1) smaller crystalline size; (2) higher thermal stability;(3) the new strong Brnsted acidity.

关键词: TiO2-SiO2 mixed oxide, Basic hydrolysis, Photocatalytic oxidation

Abstract: A series of TiO2-XSiO2[X denotes the molar fraction(%) of silica in the mixed oxides] with different n(Ti)/n(Si) ratios was prepared with ammonia water as a hydrolysis catalyst.The photocatalysts prepared were characterized by XRD, thermal analysis, FTIR, UV-Vis and SPS.The characterization results of FTIR and UV-Vis spectra show that Ti atoms were gradually changed from octahedral coordination to tetrahedral coordination with the addition of silica, which is not beneficial for obtaining strong Brnsted acidity and higher photocatalytic activity.The photocatalytic activity experiments, which were conducted by using heptane(or SO2) as the model reactant, showed that TiO2-SiO2 containing a suitable amount of silica can exhibit much higher photocatalytic activity than pure TiO2.The enhanced photocatalytic activity can be attributed to three following factors: (1) smaller crystalline size; (2) higher thermal stability;(3) the new strong Brnsted acidity.

Key words: TiO2-SiO2 mixed oxide, Basic hydrolysis, Photocatalytic oxidation