Synergistic Effect of Acid Treatment and Metal Oxide Co-Catalyst Loading on Inactive Rutile TiO2 Nanorods for Enhanced Photocatalytic Degradation of Orange (II) Dye

Wednesday, 31 May 2017
Grand Ballroom (Hilton New Orleans Riverside)
L. K. Dhandole (Chonbuk National University,), M. A. Mahadik (Chonbuk National University), S. G. Kim (Chonbuk National University,), M. Cho (Chonbuk National University), H. S. Chung (Korea Basic Science Institute, Jeonju), J. H. Ryu (Korea Institute of Geoscience and Mineral Resources), and J. S. Jang (Chonbuk National University,)
Transition metal oxides (MnO, NiO, Co2O3 and CuO) 1 w % loaded on acid treated TiO2 nanorods were successfully prepared by chemical treatment and wet impregnation method. The catalyst were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS), Fourier transform infrared spectroscopy (FT-IR) and UV-visible diffuse reflectance spectroscopy (UV-DRS). FT-IR results confirmed the presence of H2O and OH groups on the surface of acid treated photocatalyst and TEM and XPS results confirmed the fine dispersion of metal and their oxide on TiO2 nanorods. The photocatalytic activity of as-prepared, acid treated, metal oxide loaded and metal oxide loaded on acid treated nanorods were compared and rate constant values were determined from kinetics of the degradation of Orange (II) dye. Cobalt oxide 1w% loaded on 1.0 M acid treated TiO2 nanorods exhibited the higher photocatalytic Orange (II) degradation efficiency 98.57% (within 120 min) than as-prepared and metal loaded acid treated samples under the solar irradiation. The synergistic effect of cobalt oxide 1w% loaded on 1.0 M acid treated TiO2 nanorods over Orange (II) degradation is considered due to fine dispersion of metal oxides on the OH rich surface of acid treated TiO2nanorods. The mechanism of enhanced photocatalytic activity and photoelectrochemical analysis of photocatalyst also studied.

Key words: TiO2rutile nanorods; acid treatment; wet impregnation; transition metal oxides, dye degradation; synergistic effect


This research was supported by the BK21 plus and Basic Science Research Programs (2012R1A6A3A04038530) funded by the Korean National Research Foundation (NRF).