Perfluorooctanoic acid (PFOA) have been photodegraded using titanium dioxide (TiO2). The reaction kinetics have been studied changing the surfactant concentration in solution. The corresponding kinetic curves showed a slight decrease of the mineralization when the concentration of the photocatalyst increased. The surface composition of the photocatalyst was analyzed by XPS before and after the photodegradation reaction, in order to evaluate the variations during the photoabatement. It has been observed the formation of different titanium fluorides together with pure titanium dioxide on the catalyst surface . The formation of fluorinated titanium species could modify the photodegradation.
Decomposition of perfluorooctanoic acid photocatalyzed by TiO2: chemical modification of the catalyst surface induced by fluoride ions / S. Gatto, M. Sansotera, F. Persico, C. Pirola, W. Navarrini, C.L. Bianchi. ((Intervento presentato al 11. convegno EuropaCat European congress on catalysis tenutosi a Lyon nel 2013.
Decomposition of perfluorooctanoic acid photocatalyzed by TiO2: chemical modification of the catalyst surface induced by fluoride ions
S. Gatto;M. Sansotera;C. Pirola;C.L. Bianchi
2013
Abstract
Perfluorooctanoic acid (PFOA) have been photodegraded using titanium dioxide (TiO2). The reaction kinetics have been studied changing the surfactant concentration in solution. The corresponding kinetic curves showed a slight decrease of the mineralization when the concentration of the photocatalyst increased. The surface composition of the photocatalyst was analyzed by XPS before and after the photodegradation reaction, in order to evaluate the variations during the photoabatement. It has been observed the formation of different titanium fluorides together with pure titanium dioxide on the catalyst surface . The formation of fluorinated titanium species could modify the photodegradation.Pubblicazioni consigliate
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