Preparation, characterization and application of TiO_2 nanoparticles surface-modified by DDAT

摘要

DDAT(S-1-Dodecyl-S'-(α, α'-dimethyl-α"-acetic acid) trithiocarbonate) modified TiO_2 photocatalysts were prepared by hydrothermal treatment before TiO_2 crystallization. The adsorption of DDAT onto the surface of titania nanoparticles led the shifting of the onset wavelength of the optical absorption in the visible range corresponding to ligand-to-metal charge transfer transition within the surface-modified complex. The interaction of TiO_2 nanoparticles with DDAT was investigated by infrared spectra. The XRD indicated that the modification process could not influence the crystallite phase of TiO_2. The photocatalytic studies suggested that the DDAT modified TiO_2 photocatalysts showed enhanced photocatalytic efficiency of photodegradation of 2,4-dichlorophenol compared with the as-prepared TiO_2 under visible-light irradiation.