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    STUDIA CHEMIA - Ediţia nr.3 din 2007  
         
  Articol:   THE INFLUENCE OF THE HEAT TREATMENT ON THE PHOTOACTIVITY OF THE TIO2-SIO2 AEROGELS.

Autori:  A. PETER, IONEL CĂTĂLIN POPESCU, E. INDREA, P. MARGINEAN, V. DANCIU. 		 
       
         
  Rezumat:  TiO2-SiO2 aerogels were prepared by sol-gel method followed by supercritical drying with liquid CO2 and heat treatment. The structural and morphological particularities of the prepared TiO2-SiO2 aerogels were studied by means of X-ray diffraction and BET analysis. The photocatalytic activity of the TiO2-SiO2 aerogels was determined by monitoring the degradation rate of the salicylic acid. It was found that the efficiency of the TiO2-SiO2 catalyst strongly depends upon the heat treatment temperature and also on the silica content. The larger specific surface area has been achieved for the sample with the higher Si content. The heat treatment performed at 6000C and 7000C allowed the formation of anatase phase, as well as the meso- to micropore transformation. The TiO2-SiO2 (1:1 molar ratio) aerogel, heat treated at 5000C has the highest photocatalytic activity.  
         
     
         
         
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