西南石油大学学报(自然科学版) ›› 2008, Vol. 30 ›› Issue (3): 113-115.DOI: 10.3863/j.issn.1000-2634.2008.03.029

• 油气化学工程与化工 • Previous Articles     Next Articles

SiO2 NANOLAYERS AND CHARACTERISTICS COATED ON THE SURFACE OF TiO2 PARTICLES

HE Wen-sena,ZHU Jia-linb,LUO Hao-wena   

  1. University of Electronic Science and Technology of China:a.School of physical Electronics;b.School of Applied Mathematics,Chengdu Sichuan 610054,China
  • Received:2007-01-11 Revised:1900-01-01 Online:2008-06-20 Published:2008-06-20

Abstract: As an important catalyst,TiO2 is widely applied in petrochemical industry,especially,in coalbased synthesized oil and superdeep desulphure,meanwhile,TiO2 is also important raw material of white pigment.In order to improve the application function of TiO2,surfacecoating modification of SiO2 nanolayers is done to TiO2 particles.The continuous method precisely controlling PH value is used to coat SiO2 nanolayers on the surface of TiO2 particles,and TEM,HRTEM,EDS,XPS,ICP and optical property are characterized.It is proved that a continuous SiO2 nanolayer forms on the surface of TiO2 particle with thickness of some 3.5~4.0nm,the SiO2 gel nanolayer is quite tight without floccus on noncoated film,and the TiO2 is dispersed in the shape of single particle,there is no the occurance particles being coated together.XPS indicates SiO2 gel on the surface of TiO2 particle after coating is physically coated.After coating,the optical property of SiO2 sample is apparently improved,and the dispersing property of the sample in different media is changed,in water,the dispersing ability increases to 93.6%.The surface treatment,as a catalyst,can be used in coalbased synthesized oil and superdeep de sulphure

Key words: TiO2, SiO2, gel, nanolayers

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