Preparation and Visible-light Photocatalytic Performance of Mesoporous Vanadium-doped Titania†

doi:10.7503/cjcu20140213

Abstract

Abstract:

Based on employing the liquid crystal of surfactant cetyltrimethyl ammonium bromide(CTAB), tetrabutyl titanate and ammonium metavanadate as template, titanium source and doping-ion precursor, respectively, vanadium-doped mesoporous titanium dioxide(VMT) was obtained by sol-gel method. The structure of obtained sample was characterized via X-ray diffraction(XRD), nitrogen adsorption-desorption, thermogravimetry-differential thermal analysis(TG-DTA), X-ray photoelectron spectroscopy(XPS), UV-Visible diffuse reflection spectrometry(UV-Vis) and transmission electronic microscopy(TEM). Choosing methylene blue(MB) as the target degradation product, the photocatalytic performance of VMT was discussed under visible light irradiation. The results show that doping vanadium can reduce TiO₂ particle size, inhibit photo-electron and hole recombination rate as well as increase specific surface area and the concentration of titanium ion and hydroxyl. Thus VMT exhibits the highest catalytic activity among pure MT, VMT and P25 under UV-light irradiation. In addition, doping vanadium can also lessen MT band-gap energy and improve its catalytic activity under visible light. The optimal photocatalytic condition is as follows: catalyst concentration of 0.83 g/L and MB concentration of 1 mg/L.

Key words: Sol-gel method, Vanadium-doped titana, Mesoporous material, Methylene blue, Photocatalytic performance

CLC Number:

O643

TrendMD:

XU Peng, LI Youji, LIU Chen, LI Ming, DENG Ruicheng. Preparation and Visible-light Photocatalytic Performance of Mesoporous Vanadium-doped Titania^†[J]. Chem. J. Chinese Universities, 2014, 35(9): 1954.

Figures/Tables 11

Fig.1 Experimental equipment for photocatalytic reaction

Fig.2 Low-angle XRD patterns of VMT(a) and MT(b)

Fig.3 Wide-angle XRD patterns of samples with different heat-treatment temperatures

Fig.4 TG-DTA curves of VMT gel

Fig.5 N2 adsorption-desorption isotherms(A) and pore size distribution(B) of samples MT(a) and VMT(b)

Fig.6 Survey XPS spectrum(A) and split peak fitting spectrum of V2p32 for VMT(B) and split peak fitting spectra of Ti2p(C) and O1s(D) for MT(a) and VMT(b)

Fig.7 SEM images of MT(A), VMT(B) and TEM(C), HRTEM images(D) of VMT Inset of (D) is the electron diffraction spectrum.

Fig.8 UV-Vis diffuse reflection spectra of MT(a) and VMT(b)

Fig.9 Fluorescence spectra of MT(a) and VMT(b)

Fig.10 Effects of catalyst and degradation time on MB degradation rate(A) and ln(c0/c)(B) a. P25, UV light; b. MT, UV light; c. VMT, UV light; d. VMT, visible light; (B) a. y=0.004x, R2=0.97; b. y=0.005x, R2=0.99; c. y=0.011x, R2=0.98; d. y=0.007x, R2=0.99.

Fig.11 Effects of MB initial concentration(A) and catalyst concentration(B) on degradation rate constant

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