Publications Repository - Gdańsk University of Technology

Formation of a surface complex between organic molecules and TiO2 is one of the possible strategies for the development of visible light-induced TiO2 photoactivity. Herein, three ionic liquids (ILs) with the same cation and dierent anions (1-butylpirydynium chloride/bromide/iodide) have been applied for the surface modification of TiO2 and to understand the role of anions in visible light-induced activity of ILs-TiO2 systems. Photocatalytic screening tests (the measurements of phenol photodegradation reaction rate) revealed that anion type aected visible light activity ( > 420 nm) of TiO2 obtained by the ILs-assisted solvothermal method. Density functional theory (DFT) calculations demonstrated that interactions between halogen anions and oxygen vacancies (OV) on the surface of the TiO2 particles could be responsible for the specific wavelength-induced excitation and finally for the observed photoactivity of titania under visible light. Finally, our theoretical calculations have been proven by experiments using monochromatic light (the apparent quantum eciency was measured) and the properties of obtained samples were characterized using scanning electron microscopy (SEM), X-ray powder

Authors

• dr inż. Marta Paszkiewicz-Gawron,
• Mgr. Samanta Makurat,
• Prof. Janusz Rak,
• Magdalena Zdrowowicz,
• dr hab. Wojciech Lisowski,
• Prof. dr hab. inż. Adriana Zaleska-Medynska,
• Kowalska Ewa,
• mgr inż. Paweł Mazierski,
• dr hab. inż. Justyna Łuczak link open in new tab