Photoinduced interaction between riboflavin and TiO2 colloid

The adsorption of riboflavin on the surface of TiO2 colloidal particles and the electron transfer process from its singlet excited state to the conduction band of TiO2 were examined by absorption and fluorescence quenching measurements. The apparent association constants (Kapp) were determined. The quenching mechanism is discussed involving electron transfer from riboflavin to TiO2.