KOPRI Repository

Titanium dioxide surface modified with both palladium and fluoride as an efficient photocatalyst for the degradation of urea

Cited 4 time in wos
Cited 5 time in scopus
Metadata Downloads
Titanium dioxide surface modified with both palladium and fluoride as an efficient photocatalyst for the degradation of urea
Other Titles
산화티타늄 표면개질을 통한 요소분해 연구
Kim, Hyoung-il
Kim, Kitae
Park, Soona
Kim, Wooyul
Kim, Seungdo
Kim, Jungwon
photocatalysis; Titanium dioxide; Palladium loading; Fluoride complexation; Urea degradation
Issue Date
김형일, et al. 2019. "산화티타늄 표면개질을 통한 요소분해 연구". SEPARATION AND PURIFICATION TECHNOLOGY, 209(1): 580-587.
TiO2 surface modified with both Pd nanoparticles and fluorides (F-TiO2/Pd) was prepared and applied as a photocatalyst in the degradation of urea. Various surface analysis techniques, including X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and energy-dispersive X-ray spectroscopy, were used to verify the coexistence of Pd nanoparticles and fluorides on the surface of TiO2 in F-TiO2/Pd. F-TiO2/Pd showed a higher photocatalytic activity than those of bare TiO2 and single-component-modified TiO2 photocatalysts such as fluorinated TiO2 (F-TiO2) and Pd-loaded TiO2 (Pd/TiO2). The higher urea degradation efficiency of F-TiO2/Pd is ascribed to the enhanced production of hydroxyl radicals (●OH) by the synergistic action of the surface Pd and fluoride. Pd nanoparticles and fluorides facilitate the transfer of valence band holes (hvb+) and their reaction with water molecules, respectively, synergistically enhancing the production of ●OH. The photocatalytic activity of F-TiO2/Pd for the degradation of urea increased upon increasing the fraction of the fluorinated TiO2 surface, which is higher at higher fluoride concentrations and lower pH. Although Pt/TiO2 showed higher photocatalytic activity for the degradation of urea than those of Pd/TiO2 and Au/TiO2, the strong positive effect of fluoride complexation was only exhibited by Pd/TiO2 (a slight positive effect and a negative effect were observed for Au/TiO2 and Pt/TiO2, respectively). As a result, the degradation of urea proceeded more rapidly in a UV-irradiated suspension of F-TiO2/Pd than when any of other photocatalysts (i.e., bare TiO2, Pd/TiO2, F-TiO2, Au/TiO2, F-TiO2/Au, Pt/TiO2, and F-TiO2/Pt) were used under the same conditions. The first-order degradation rate constants (k) of urea depending on the type of TiO2 were as follows: 0.097 h?1 for bare TiO2, 0.158 h?1 for Pd/TiO2, 0.151 h?1 for F-TiO2, 0.351 h?1 for F-TiO2/Pd, 0.173 h?1 for Au/TiO2, 0.223 h?1 for F-TiO2/Au, 0.240 h?1 for Pt/TiO2, and 0.165 h?1 for F-TiO2/Pt, respectively. In addition, F-TiO2/Pd proved to be stable in repeated urea degradation cycles.
Files in This Item
General Conditions
      ROMEO Green
    Can archive pre-print and post-print or publisher's version/PDF
      ROMEO Blue
    Can archive post-print (ie final draft post-refereeing) or publisher's version/PDF
      ROMEO Yellow
    Can archive pre-print (ie pre-refereeing)
      ROMEO White
    Archiving not formally supported

    Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.