Effect of Palladium Nanoparticles on Photocatalytic Characteristics of N doped Titania Catalyst

doi:10.1016/j.jmst.2014.11.023

Abstract

Abstract: To improve the photocatalytic efficiency of TiO₂ nanotubular catalyst, N doped and Pd decorated titania nanotubes was successfully synthesized via anodizing, hydrazine hydrate treatment and photoreduction of Pd ions. The small Pd nanoparticles were precipitated on TiO₂ nanotubes through photoreduction of Pd ions, and its distribution is relatively homogeneous. From X-ray photoelectron spectrometry (XPS) result, the N 1s spectrum represents two peaks with binding energy at 399.7 and 400.7 eV, which suggests that the nitrogen elements doped by hydrazine hydrate treatment are located in interstitial sites of the TiO₂ crystalline structure. For N doped TiO₂ nanotubes with Pd particles, a high photocurrent was detected due to increase of interface charge carrier separation rate. Moreover, N doped and Pd decorated TiO₂ nanotubes exhibited much higher dye destruction efficiency and rate constant due to the synergistic effect of the N dopant and the Pd deposition on TiO₂ nanotubes.

Key words: Pd nanoparticle, Titania nanotube, Anodizing, Dye decomposition

Jong-Ho Lee, Jeong-Il Youn, Young-Jig Kim, Han-Jun Oh. Effect of Palladium Nanoparticles on Photocatalytic Characteristics of N doped Titania Catalyst[J]. J. Mater. Sci. Technol., 2015, 31(6): 664-669.

Figures/Tables 9

FE-SEM images exhibit (a) surface and (b) cross-sectional area of anodic titania nanotubes formed at 30 V for 30 min in EG/0.5 wt% NH4F/5 wt% water mixture.

SEM image of the (a) TiO2 nanotubular surface deposited with Pd particles and (b) EDX spectra, (c) Pd particles exhibited on the surface of the nanotube (magnified image of image (a)).

Size and distribution of Pd nanoparticles on TiO2 nanotubes.

XPS survey spectra of (a) TiO2 nanotube and N doped TiO2 with Pd particles, and (b) Pd 3d peak of N doped TiO2 nanotube with Pd particles.

XRD patterns of (a) bare TiO2 nanotube and (b) N doped TiO2 nanotube deposited with Pd nanoparticles.

N 1s spectrum of XPS for N doped TiO2 nanotubes/Pd particles.

Photocurrent response of anodic TiO2, N doped titania and N doped and Pd decorated titania nanotubes in 0.5 mol/L K2SO4 solution, under visible light impulse irradiation.

Photocatalytic degradation rate of rhodamine B on (a) bare TiO2, (b) N doped, and (c) N doped TiO2 nanotube with Pd particles.

Dependence of ln(C0/Ct) vs time for rhodamine B decomposition on (a) bare TiO2, (b) N doped, and (c) N doped TiO2 nanotube with Pd particles.

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