Properties and Photocatalytic Activity of Rutile TiO2 Nanosheets

doi:10.15541/jim20150110

Abstract

Abstract:

Rutile TiO₂ nanosheets were prepared by Sol-Gel method, proton exchange and delamination method. The samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), UV-Vis diffuse reflectance spectroscope, X-ray photoelectron spectroscope (XPS) and photoluminescence (PL). The transference of photogenerated charge carriers was studied. It is revealed that the rutile TiO₂ nanosheets (thickness 5 nm) exhibit increased specific surface area (185.7 m²/g) and enlarged energy band gap, resulting in enhanced redox ability, when compared with rutile TiO₂ samples. In addition, the photogenerated charge carriers are able to transfer to the surface of nanosheets, due to their unique structure enabling photogenerated charge carriers to be effective separation during photocatalytic reactions. Therefore, the rutile TiO₂ nanosheets can enhance photocatalytic activity. Forthermore, the rutile TiO₂ nanosheets exhibite higher photocatalytic activity than rutile and anatase TiO₂ samples on the photocatalytic degradation of 4-chlorophenol under ultraviolet irradiation.

Key words: rutile TiO2 nanosheet, specific surface area, energy band structure, photogenerated carrier, photo- catalytic activity

CLC Number:

O643
O644

ZHAO Dan-Dan, YU Yan-Long, GAO Dong-Zi, CAO Ya-An. Properties and Photocatalytic Activity of Rutile TiO₂ Nanosheets[J]. Journal of Inorganic Materials, 2016, 31(1): 1-6.

Figures/Tables 8

Fig. 1 XRD patterns of r-TiO2 sheet (a), r-TiO2 (b) and a-TiO2 (c) samples

Table 1 Cell parameters, cell volume and specific surface area of r-TiO2 sheet, r-TiO2 and a-TiO2 samples

Sample	Cell parameters /nm		Cell volume /nm³	S_BET/(m²·g^-1)
Sample	a=b	c	Cell volume /nm³	S_BET/(m²·g^-1)
r-TiO₂sheet	0.45966	0.29585	0.06251	185.7
r-TiO₂ a-TiO₂	0.45908	0.29549	0.06228	2.6
r-TiO₂ a-TiO₂	0.37884	0.95180	0.13660	63.8

Fig. 2 TEM (HRTEM) images of r-TiO2 sheet (a, b), r-TiO2 (c) and a-TiO2 (d) samples

Fig. 3 UV-Vis diffuse reflectance spectra of r-TiO2 sheet (a), r-TiO2 (b) and a-TiO2 (c) samples

Fig. 4 XPS valence band spectra of r-TiO2 sheet (a)、r-TiO2 (b) and a-TiO2 (c) samples

Fig. 5 Photoluminescence emission spectra of r-TiO2 sheet (a)、r-TiO2 (b) and a-TiO2 (c) samples

Table 2 Photocatalytic activity of r-TiO2 sheet, r-TiO2 and a-TiO2 samples under ultra-violet light irradiation

Sample	Degradation ratio^a (Δc/c₀)	K^b/(×10^-3, min^-1)	t_1/2/min	Specific photocatalytic acitivity^c/ (×10^-6, mol·g^-1·h^-1)
Blank^d	0.132	1.80	377	21.78
r-TiO₂	0.469	5.19	128.0	101.6
a-TiO₂	0.776	12.54	60.0	224.0
r-TiO₂sheet	0.979	33.62	22.6	290.5

Fig. 6 The c-t curves of photocatalytic degradation of 4-chlorophenol by r-TiO2 sheet (a), r-TiO2 (b) and a-TiO2 (c) samples

References 23

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Properties and Photocatalytic Activity of Rutile TiO₂ Nanosheets

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