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875418128(½ð±Ò+3): 2011-04-28 21:23:42
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£¨1£©To obtain the supported TiO2/SiO2 materials, a solution with the required amount of titanium tetraisopropoxide (TTIP) in isopropanol (TTIP:i-PrOH weight ratio = 1:8) to get 20, 40 and 60 TiO2 wt% loading was added to each silica support.
£¨2£©After stirring the mixture for 45 minutes at room temperature, water was added until a molar ratio 160 H2O:TTIP was reached. The stirring was then continued for other 45 minutes.
£¨3£©The mixture was centrifuged and the recovered solid was dried at 110 ºC overnight and calcined at 550 ºC for crystallisation.

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(1) Silica  is  suspended in  deionized  water,  to which  an  appropriate amount  of TiC13  (Merck,  15%  HCl  solution)  is  added  while  the suspension  is  vigorously  stirred  ensuring  a  good homogeneity  during  the precipitation.  
(2)Then,  the  suspension  is  neutralized  up  to  pH  ca.  7  by  slow  addition of  ammonium  solution.  
(3)The  precipitate  is  filtered  and washed  with  deionized  water  several  times.
(4)Then,  it  is dried  at  373  K  for  12 h and  calcined  at 773  K  in  air  for 12 h.

This  procedure  allows  the  deposition  of hydrated Ti(III)  oxide  which  yields  dispersed  TiO2  species  on the  silica  surface  after  thermal  treatment.
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