Synthesis of Highly Dispersed Au Nanoparticles Modified N-Doped TiO2 Nanotubes by the Assist of Lysine and Their Photocatalytic Activity†

doi:10.7503/cjcu20160377

Abstract

Abstract:

N-doped TiO₂ nanotubes were synthesized by the combination of sol-gel and hydrothermal methods firstly; and then Au nanoparticles were deposited on the N-doped TiO₂ nanotubes by a simple one-pot process with lysine as both the linker and capping agent. The morphology, structure, optical absorption and composition of the samples were characterized by means of TEM, XRD, UV-Vis and XPS. The photodegradation rates of methyl orange under UV light irradiation were used to evaluate the photocatalytic activities of samples. The effects of N content, Au content, lysine and calcination on the photocatalytic activities of Au/N-doped TiO₂ nanotubes were discussed. The results exhibit that Au nanoparticles capped by lysine are highly dispersed on the support without any aggregation and the obtained sample exhibits higher photocatalytic activity in comparison with pure TiO₂ nanotubes. The improved photocatalytic activity is attributed to the narrower band gap of N-doped TiO₂, the high dispersion of Au nanoparticles and the reduced recombination of photogenerated electrons and holes caused by the formation of metal-semiconductor Schottky junction between Au and TiO₂.

Key words: TiO2 nanotube, N doping, Au nanoparticle, Lysine, Photodegradation of methyl orange

CLC Number:

O644
O611.4

TrendMD:

AN Huiqin, YU Yucai, YAN Lin, WU Tingting, LI Xiaofeng, HE Xiaoling, ZHAO Lizhi, HUANG Weiping. Synthesis of Highly Dispersed Au Nanoparticles Modified N-Doped TiO₂ Nanotubes by the Assist of Lysine and Their Photocatalytic Activity^†[J]. Chem. J. Chinese Universities, 2016, 37(11): 2034.

Figures/Tables 12

Fig.1 Procedure for the deposition of Au on N-doped TiO2 nanotubes by the assist of lysine

Fig.2 XRD patterns of TiO2 nanotubes(a) and N-doped TiO2 nanotubes with different N contents(b, c)w(N): b. 1.0%; c. 2.0%.

Fig.3 XRD patterns of TiO2 nanotubes(a) and 1.0% N-doped TiO2 nanotubes with different Au loadings(b—d)w(Au): b. 2.0%; c. 3.0%; d. 4.0%.

Fig.4 Wide XPS spectrum of Au/N-TiO2 nanotubes with 1.0% N and 3.0% Au loading(A) and high resolution XPS spectra for Ti2p(B), N1s(C), Au4f(D), C1s(E) and O1s(F)

Fig.5 HRTEM(A) and TEM(B) images of 1.0% N-TiO2 nanotubes and HRTEM images of Au/N-TiO2 nanotubes with 1.0% N and 3.0% Au loading in the presence(C) and absence(D) of lysine

Fig.6 UV-Vis absorption spectra of TiO2 nanotubes(a) and 1.0% N-doped TiO2 nanotubes(b)

Fig.7 Photocatalytic activity of N-doped TiO2 nanotubes with different N contents(A) and comparison of photocatalytic activities of 1.0% N-doped TiO2 nanotubes(a) and pure TiO2 nanotubes(b)(B) toward MO degradation(A) w(N): a. 0.5%; b. 1.0%; c. 2.0%.

Fig.8 Schematic diagram of N-doped TiO2 nanotubes after light activation

Fig.9 Photocatalytic activity of Au/N-TiO2 nanotubes(1.0% N) with different Au contentsw(Au): a. 2.0%; b. 3.0%; c. 4.0%.

Fig.10 Schematic diagram for the charge separation and photodegradation of Au/N-TiO2 nanotubes(Ef: Fermi energy)

Fig.11 Photocatalytic activity of Au/N-TiO2 nanotubes with 1.0% N and 3.0% Au loading synthesized in the presence(a) and absence(b) of lysine

Fig.12 Photocatalytic activity of Au/N-TiO2 nanotubes with 1.0% N and 3.0% Au loading calcined at 300 ℃(a) and without calcination(b)

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Synthesis of Highly Dispersed Au Nanoparticles Modified N-Doped TiO₂ Nanotubes by the Assist of Lysine and Their Photocatalytic Activity^†

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References 31

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