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    STUDIA CHEMIA - Issue no. 3 / 2011  
         
  Article:   PHOTOCATALYTIC ACTIVITY OF HIGHLY POROUS TiO2-AG MATERIALS .

Authors:  DUMITRU GEORGESCU, ZSOLT PAP, MONICA BAIA, CARMEN IOANA FORT, VIRGINIA DANCIU, GEORGIAN MELINTE, LUCIAN BAIA, SIMION SIMON. 		 
       
         
  Abstract:  In the present work our interest is focused on evaluating the photocatalytic performances of TiO2 aerogels containing silver and correlating these data with the structural and morphological particularities. The highly porous TiO2 aerogels were obtained by TiO2 gels’ impregnation with various concentrations of AgNO3 solutions, followed by supercritical drying. In order to determine the morpho-structural parameters several complementary techniques such as nitrogen sorption, transmission electron microscopy in high resolution mode (HRTEM) and diffuse reflectance UV-vis spectroscopy (DRS) were employed. The photocatalytic activity of the porous samples was also tested and correlated with the morpho-structural characteristics. The presence of silver led to the increase of the crystallization degree of TiO2, with anatase and brookite phases being especially identified.

Keywords: TiO2 aerogel, silver, photocatalytic activity, morphology, structure 		 
         
     
         
         
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