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Project ID: ICA3-CT-2002-10016
Finanziato nell'ambito di: FP5-INCO 2
Paese: Spain

Coupled method for water disinfection treatment combining Ti and Ru based photocatalysts using solar energy

This result shows the capability for the drinking water disinfection of the solar photocatalysis with TiO2 and Ruthenium complexes -Ru(II)- in a solar photoreactor. Both systems are proven to be sucessfull if used separated. Nevertheless, the combined effect of both disposed one after the other (the order is not important, as it has been proven) yields not significative efficiency improvement, since no synergetic effects could be detected in the experimental series performed. Immobilized Ru(II)-complexes disinfection results Ru(II)-complexes within this project are specifically designated for the drinking disinfection experiments. In the experiments with Ru(II)-complexes immobilized on polymer strips the E. Coli concentration already decreased 4 decimal powers within 60 min. Comparing the Ru(II)-complexes performance as a photosensitizer for bacteria disinfection with a blank experiment (only light, no catalyst), it becomes clear that Ru(II)-complexes involved processes have a strong impact in bacteria deactivation. From achieved results, has been observed that the bacteria concentration in the disinfection experiment with Ru(II) decreases fast, while the concentration of the blank experiment almost keeps being the same. Ru(II) versus immobilized TiO2-P25 on Ahlstrom paper When comparing disinfection capacities of Ru(II)-complexes immobilized on polymer strips and TiO2 P25 immobilized on Ahlstrom (KN47-type) paper matrixes, both in the plane support reactor, the Ru(II) photosensitized disinfection starts faster. That means that the reaction constant is higher and the disinfection performance is better. Effects of TiO2 with Ru(II) in series This part analyses the possible synergetic effect of Ru(II) together with TiO2. To examine this point, the two different catalysts were connected in series to assess the performance of hybrid catalysed systems.It can be observed that the experiment with only Ru(II)-complex has the best disinfection activities, followed by the experiment with KN47 with P25 TiO2 coating. Up to date, a small difference exists to the disinfection results of the experiment with Ru(II) and KN47 with P25 TiO2 coating in series. Therefore, no synergetic effects could be detected in the experimental series performed.

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