Ionic Liquid-assisted Synthesis of Anatase TiO2 Nanotubes and Their UV Light Photocatalytic Activities†

doi:10.7503/cjcu20131201

Abstract

Abstract:

Hydrogen titanate nanotubes with high crystallinity were prepared under the ionic liquid [Bmim]OH-assisted hydrothermal conditions and then converted into anatase TiO₂ nanotubes by calcination at 470 ℃ for 2 h. The phases, morphologies and specific surface areas of the resulting samples were investigated by means of powder X-ray diffraction(XRD), transmission electron microscopy(TEM), Raman spectroscopy and Brunauer-Emmett-Teller(BET) surface area analysis. The results indicated that the specific surface area and the pore size of anatase TiO₂ nanotubes were ca. 355 m²/g and 25 nm, respectively. Both anatase TiO₂ nanotubes and hydrogen titanate nanotubes exhibited high UV-light-driven photocatalytic degradation activity of parachlorophenol. The photodegradation efficiency of parachlorophenol reached 44% by anatase TiO₂ nanotubes, in 1 h of reaction. The introduction of ionic liquid could not only enlarge the temperature range of hydrothermal synthesis, but also benefit for improving the crystallinity of hydrogen titanate nanotubes.

Key words: Anatase, TiO2 nanotubes, Ionic liquid, Hydrothermal synthesis

CLC Number:

O611.4

TrendMD:

WU Liyan, LIU Zhifang, QIN Qing, CAO Yaan, ZHENG Wenjun. Ionic Liquid-assisted Synthesis of Anatase TiO₂ Nanotubes and Their UV Light Photocatalytic Activities^†[J]. Chem. J. Chinese Universities, 2014, 35(5): 934.

Figures/Tables 7

Fig.1 Anatase TiO2 nanotubes synthesized with [Bmim]OH at 180 ℃ for 24 h and calcined at 470 ℃ for 2 h^

Fig.2 Raman spectra of anatase TiO2 nanotubes after calcination at 470 ℃ for 2 h(a) and hydrogen titanate nanutubes synthesized with [Bmim]OH at 180 ℃ for 24 h(b)

Fig.3 EDS spectrum of hydrogen titanate nanotubes synthesized with [Bmim]OH at 180 ℃ for 24 h

Fig.4 Nitrogen adsorption-desorption isotherms of anatase TiO2 nanotubes after calcination at 470 ℃ for 2 h(A) and hydrogen titanate nanotubes prepared with [Bmim]OH at 180 ℃ for 24 h(B)^Insets are the correspongding pore size distribution curves.

Fig.5 XRD patterns of the hydrogen titanate nanotubes obtained by hydrothermal methods at 120 ℃ for 24 h^a. Without [Bmim]OH; b. with [Bmim]OH, V(NaOH)∶V([Bmim]OH)=1∶3.

Fig.6 Representation of the crystal structure of H2Ti2O5·H2O projecting along [010] direction(A) and [Bmim]+ ions perpendicular to the (NaH)xTi2-x/4□x/4O4·H2O sheets and their self-assembly into order structures along the c axis(B)

Fig.7 Photodegradation of parachlorophenol under UV-light irradiation^a. Blank; b. TiO2 nanoparticles; c. anatase TiO2 nanotubes(calcined at 470 ℃); d. hydrogen titanate nanotubes prepared with [Bmim]OH; e. hydrogen titanate nanotubes prepared without [Bmim]OH; f. anatase TiO2 nanotubes(calcined at 450 ℃).

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Ionic Liquid-assisted Synthesis of Anatase TiO₂ Nanotubes and Their UV Light Photocatalytic Activities^†

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