Preparation and Properties of Co-doped TiO2 with Assistance of Ionic Liquid

doi:10.15541/jim20130586

Abstract

Abstract:

Co-doped mesoporous TiO₂ photocatalysts were prepared by an ionic liquid 1-butyl-3-methylimida-zolium tetrafluoroborate ([C₄MIM]BF₄) modified Sol-Gel method. The effects of Co doping on the surface area, crystalline phase, chemical binding states and compositions, and absorbance of the Co-doped mesoporous TiO₂ photocatalysts were studied by N₂ adsorption-desorption measurements (BET), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance absorption spectra (UV-Vis DRS). BET analysis showed that Co/TiO₂ photocatalyst was mesoporous structure with large surface area. XRD patterns indicated that the Co-doped mesoporous TiO₂ photocatalysts was anatase structure. XPS spectra indicated that the Co²⁺ replaced Ti⁴⁺and entered into TiO₂ lattice, which reduced the band gap of TiO₂and thereby extending the light response range to the visible region (UV-Vis spectra). Photocatalytic activity of the Co/TiO₂ mesoporous photocatalysts was evaluated by photodegradation of methylene blue (MB) under visible light (λ>420 nm). Co-doped TiO₂exhibited obvious visible light activity for MB photodegradation, and 0.3%Co/TiO₂ exhibited the highest photocatalytic activity.

Key words: ionic liquid, titanium dioxide, Co doping, visible light activity

CLC Number:

O649

ZHANG Li-Juan, DI Lan-Bo, LI Yan-Chun, ZHANG Xiu-Ling. Preparation and Properties of Co-doped TiO₂ with Assistance of Ionic Liquid[J]. Journal of Inorganic Materials, 2014, 29(8): 801-806.

Figures/Tables 8

Fig. 1 N2 adsorption-desorption isotherms (a) and pore size distribution curves (b) of TiO2 and Co/TiO2

Fig. 2 XRD patterns of TiO2 (a), 0.1%Co/TiO2 (b), 0.3% Co/ TiO2 (c) and 0.5%Co/TiO2 (d)

Table 1 Structural parameters of the TiO2 and Co/TiO2

Sample	Pore volume/<br/>(cm³·g^-1)	Pore radius/<br/>nm	Surface area/<br/>(m²·g^-1)
TiO₂	0.21	6.33	51.6
0.1%Co/TiO₂	0.21	6.31	57.4
0.3%Co/TiO₂	0.25	6.32	75.1
0.5%Co/TiO₂	0.23	6.33	63.9

Fig. 3 TEM images of TiO2 (a) and 0.3%Co/TiO2 (b)

Fig. 4 High resolution XPS spectra of 0.5%Co/TiO2

Fig. 5 UV-Vis DRS of TiO2 and Co/TiO2

Table 2 Band gap of the TiO2 and Co/TiO2

Sample	λ_g/nm	E_g/eV
TiO₂	387.5	3.20
0.1%Co/TiO₂	427.5	2.90
0.3%Co/TiO₂	463.4	2.68
0.5%Co/TiO₂	476.5	2.60

Fig. 6 Photocatalytic activity (a) and the degradation rate curves (b) of Co/TiO2 with different contents of Co

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Preparation and Properties of Co-doped TiO₂ with Assistance of Ionic Liquid

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