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Seminarji / Predavanja

 

11. marec 2010 ob 12:00, Kolarjeva predavalnica
 
Chemical surface  modification of single walled carbon nanotubes for the preparation of  nanostructured SWCNT/TiO2 photocatalysts


Rita Marques

Laboratory of Catalysis and Materials, Department of Chemical Engineering, Faculty of Engineering, University of Porto, Porto, Portugalska

Carbon nanotubes (CNTs) have been widely used in catalytic applications due to their interesting and unique physical and chemical properties, such as high mechanical and thermal resistance. Synthesis of titanium dioxide (TiO2) with incorporation of CNTs yields photocatalytic materials capable of absorbing visible light. This behaviour is of great interest since merely a 3-6% of solar radiation consists of UV light. Hence, the use of CNT/TiO2 composite materials in photocatalytic processes can result in a better usage of the sun as a natural source of light.

In contrast with other carbon materials, CNTs are usually poor in oxygenated surface groups. The functionality of these materials is normally accomplished through chemical treatments often using nitric acid. These treatments enable to introduce surface groups that are believed to participate in the covalent anchorage of TiO2. Thus, CNTs have to be subjected to specific treatments, in order to modify their chemical surface, and pursuit an effective TiO2 anchoring.

 

 

comments & suggestions to:  sanja fidler