Surface characterization of metal ions loaded TiO2 photocatalysts: structure-activity relationship

Transition metal loaded TiO2 powders were characterised and tested for the photodegradation of some organic acids. Both Lewis and Brønsted surface acid sites were present in the samples containing large amounts of Mo, V and W. The Brønsted sites are associated to the presence of the transition metals as they do not exist in the unloaded support, and in particular to the presence of these metals in high oxidation states. The trend of the pzc values of the various powders matches rather well both with the surface acidity of the samples experimentally determined by NH3 adsorption and with a scale of acidity/basicity for bulk binary oxides. XPS investigation indicates that only the presence of …

Zn,Al hydrotalcites calcined at different temperature: Characterisation and photocatalytic activity for the degradation of 2-propanol in gas-solid regime

Preparation, Characterisation and Photocatalytic Activity of Zn,Al Oxides Derived from Zn,Al LDHs